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Ge, Y., Andreica, D., Sassa, Y., Nocerino, E., Pomjakushina, E., Khasanov, R., . . . Forslund, O. K. (2023). Confirming the high pressure phase diagram of the Shastry-Sutherland model. In: Prando, G Pratt, F (Ed.), Proceedings 15th International Conference on Muon Spin Rotation, Relaxation and Resonance (SR): . Paper presented at 15th International Conference on Muon Spin Rotation, Relaxation and Resonance (SR), AUG 28-SEP 02, 2022, Univ Parma, Parma, ITALY. IOP Publishing, 2462, Article ID 012042.
Open this publication in new window or tab >>Confirming the high pressure phase diagram of the Shastry-Sutherland model
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2023 (English)In: Proceedings 15th International Conference on Muon Spin Rotation, Relaxation and Resonance (SR) / [ed] Prando, G Pratt, F, IOP Publishing , 2023, Vol. 2462, article id 012042Conference paper, Published paper (Refereed)
Abstract [en]

A Muon Spin Rotation (mu+SR) study was conducted to investigate the magnetic properties of SrCu2(BO3)(2) (SCBO) as a function of temperature/pressure. Measurements in zero field and transverse field confirm the absence of long range magnetic order at high pressures and low temperatures. These measurements suggest changes in the Cu spin fluctuations characteristics above 21 kbar, consistent with the formation of a plaquette phase as previously suggested by inelastic neutron scattering measurements. SCBO is the only known realisation of the Shatry-Sutherland model, thus the ground state mediating the dimer and antiferromagnetic phase is likekly to be a plaquette state.

Place, publisher, year, edition, pages
IOP Publishing, 2023
Series
Journal of Physics Conference Series, ISSN 1742-6588
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:kth:diva-329875 (URN)10.1088/1742-6596/2462/1/012042 (DOI)000995428200042 ()2-s2.0-85152616564 (Scopus ID)
Conference
15th International Conference on Muon Spin Rotation, Relaxation and Resonance (SR), AUG 28-SEP 02, 2022, Univ Parma, Parma, ITALY
Note

QC 20230626

Available from: 2023-06-26 Created: 2023-06-26 Last updated: 2023-12-07Bibliographically approved
Miniotaite, U., Forslund, O. K., Nocerino, E., Elson, F., Palm, R., Matsubara, N., . . . Månsson, M. (2023). Magnetic Properties of Multifunctional (LiFePO4)-Li-7 under Hydrostatic Pressure. In: Prando, G Pratt, F (Ed.), Proceedings 15th International Conference on Muon Spin Rotation, Relaxation and Resonance (SR): . Paper presented at 15th International Conference on Muon Spin Rotation, Relaxation and Resonance (SR), AUG 28-SEP 02, 2022, Univ Parma, Parma, ITALY. IOP Publishing, 2462, Article ID 012049.
Open this publication in new window or tab >>Magnetic Properties of Multifunctional (LiFePO4)-Li-7 under Hydrostatic Pressure
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2023 (English)In: Proceedings 15th International Conference on Muon Spin Rotation, Relaxation and Resonance (SR) / [ed] Prando, G Pratt, F, IOP Publishing , 2023, Vol. 2462, article id 012049Conference paper, Published paper (Refereed)
Abstract [en]

LiFePO4 (LFPO) is an archetypical and well-known cathode material for rechargeable Li-ion batteries. However, its quasi-one-dimensional (Q1D) structure along with the Fe ions, LFPO also displays interesting low-temperature magnetic properties. Our team has previously utilized the muon spin rotation (mu+SR) technique to investigate both magnetic spin order as well as Li-ion diffusion in LFPO. In this initial study we extend our investigation and make use of high-pressure mu+SR to investigate effects on the low-T magnetic order. Contrary to theoretical predictions we find that the magnetic ordering temperature as well as the ordered magnetic moment increase at high pressure (compressive strain).

Place, publisher, year, edition, pages
IOP Publishing, 2023
Series
Journal of Physics Conference Series, ISSN 1742-6588
National Category
Other Materials Engineering
Identifiers
urn:nbn:se:kth:diva-329856 (URN)10.1088/1742-6596/2462/1/012049 (DOI)000995428200049 ()2-s2.0-85152635129 (Scopus ID)
Conference
15th International Conference on Muon Spin Rotation, Relaxation and Resonance (SR), AUG 28-SEP 02, 2022, Univ Parma, Parma, ITALY
Note

QC 20230626

Available from: 2023-06-26 Created: 2023-06-26 Last updated: 2023-12-07Bibliographically approved
Sugiyama, J., Nocerino, E., Forslund, O. K., Sassa, Y., Månsson, M., Kobayashi, S., . . . Prokscha, T. (2023). Search for a space charge layer in thin film battery materials with low-energy muons. In: Prando, G Pratt, F (Ed.), Proceedings 15th International Conference on Muon Spin Rotation, Relaxation and Resonance (SR): . Paper presented at 15th International Conference on Muon Spin Rotation, Relaxation and Resonance (SR), AUG 28-SEP 02, 2022, Univ Parma, Parma, ITALY. IOP Publishing, 2462, Article ID 012046.
Open this publication in new window or tab >>Search for a space charge layer in thin film battery materials with low-energy muons
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2023 (English)In: Proceedings 15th International Conference on Muon Spin Rotation, Relaxation and Resonance (SR) / [ed] Prando, G Pratt, F, IOP Publishing , 2023, Vol. 2462, article id 012046Conference paper, Published paper (Refereed)
Abstract [en]

In an all solid state Li-ion battery, it is crucial to reduce ionic resistivity at the interface between the electrode and the electrolyte in order to enhance Li+ mobility across the interface. Recent first principles calculations predict the presence of a space-charge layer (SCL) at the interface due to the difference in the Li+ chemical potential at the interface between two different materials, as in the metal-semiconductor junction in electronic devices. However, the presence of SCL has never been experimentally observed. Our first attempt in a fresh multilayer sample, Cu(10 nm)/Li3PO4(50 nm)/LiCoO2(100 nm) on a sapphire substrate, with low-energy mu+SR (LE mu+SR) revealed a gradual change in the nuclear magnetic field distribution width as a function of implantation depth even across the interface between Li3PO4 and LiCoO2. This implies that the change in the field distribution width at SCL of the sample is too small to be detected by LE mu+SR.

Place, publisher, year, edition, pages
IOP Publishing, 2023
Series
Journal of Physics Conference Series, ISSN 1742-6588
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:kth:diva-329873 (URN)10.1088/1742-6596/2462/1/012046 (DOI)000995428200046 ()2-s2.0-85152627820 (Scopus ID)
Conference
15th International Conference on Muon Spin Rotation, Relaxation and Resonance (SR), AUG 28-SEP 02, 2022, Univ Parma, Parma, ITALY
Note

QC 20230626

Available from: 2023-06-26 Created: 2023-06-26 Last updated: 2023-12-07Bibliographically approved
Ohishi, K., Ohta, H., Kato, Y., Katori, H. A., Forslund, O. K., Nocerino, E., . . . Sugiyama, J. (2023). The internal magnetic field in a ferromagnetic compound Y2Co12P7. In: Prando, G Pratt, F (Ed.), Proceedings 15th International Conference on Muon Spin Rotation, Relaxation and Resonance (SR): . Paper presented at 15th International Conference on Muon Spin Rotation, Relaxation and Resonance (SR), AUG 28-SEP 02, 2022, Univ Parma, Parma, ITALY. IOP Publishing, 2462, Article ID 012008.
Open this publication in new window or tab >>The internal magnetic field in a ferromagnetic compound Y2Co12P7
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2023 (English)In: Proceedings 15th International Conference on Muon Spin Rotation, Relaxation and Resonance (SR) / [ed] Prando, G Pratt, F, IOP Publishing , 2023, Vol. 2462, article id 012008Conference paper, Published paper (Refereed)
Abstract [en]

The internal magnetic field in a ferromagnetic compound, Y2Co12P7 with T-C = 150 K, was studied with mu(+) SR using a powder sample down to 2 K. The wTF-mu(+) SR measurements revealed the presence of a sharp magnetic transition at T-C = 151 K, and the ZF-mu(+) SR measurements clarified the formation of static magnetic order below T-C. The presence of two muon spin precession signals in the ZF-mu(+) SR spectrum below TC indicates the existence of the two different muon sites in the lattice. By considering the muon sites and local spin densities at the muon sites predicted with DFT calculations, the ordered magnetic moments of Co were successfully determined.

Place, publisher, year, edition, pages
IOP Publishing, 2023
Series
Journal of Physics Conference Series, ISSN 1742-6588
National Category
Other Physics Topics Materials Chemistry
Identifiers
urn:nbn:se:kth:diva-329859 (URN)10.1088/1742-6596/2462/1/012008 (DOI)000995428200008 ()2-s2.0-85152633702 (Scopus ID)
Conference
15th International Conference on Muon Spin Rotation, Relaxation and Resonance (SR), AUG 28-SEP 02, 2022, Univ Parma, Parma, ITALY
Note

QC 20230626

Available from: 2023-06-26 Created: 2023-06-26 Last updated: 2023-12-07Bibliographically approved
Palm, R., Tuul, K., Elson, F., Nocerino, E., Forslund, O. K., Hansen, T. C., . . . Månsson, M. (2022). In situ neutron diffraction of NaAlD4/carbon black composites during decomposition/deuteration cycles and the effect of carbon on phase segregation. International journal of hydrogen energy, 47(80), 34195-34204
Open this publication in new window or tab >>In situ neutron diffraction of NaAlD4/carbon black composites during decomposition/deuteration cycles and the effect of carbon on phase segregation
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2022 (English)In: International journal of hydrogen energy, ISSN 0360-3199, E-ISSN 1879-3487, Vol. 47, no 80, p. 34195-34204Article in journal (Refereed) Published
Abstract [en]

The influence on the decomposition and reforming of the hydrogen storage material NaAlH4 by adding relatively low amounts of mesoporous carbon black is investigated with in situ diffraction. A 60:40 NaAlH4/carbon black composite is prepared via ball milling and characterised ex situ via X-ray diffraction, gas adsorption, temperature-programmed decomposition, and dehydrogenation/hydrogenation cycling methods. The prepared composite is deuterated, and the crystalline phase composition is determined with in situ neutron powder diffraction method during multiple decomposition/deuteration cycles. Changes in the crystalline phase composition start slightly below the melting temperature of the pristine alanate, whereas the release of deuterium starts at considerably lower temperatures. The decomposition of Na3AlD6 to NaD is almost completely reversible at the applied low deuterium pressures of >= 2 MPa. Thus, the strong effect of even low concen-trations of a mesoporous carbon black on the capability to store H2 reversibly is showcased and analysed in-depth.

Place, publisher, year, edition, pages
Elsevier BV, 2022
Keywords
Solid-stateH2 storage, Complex metal hydride, In situ neutron powder diffraction, Phase composition
National Category
Energy Engineering Physical Chemistry
Identifiers
urn:nbn:se:kth:diva-321035 (URN)10.1016/j.ijhydene.2022.08.019 (DOI)000872534500001 ()2-s2.0-85136726217 (Scopus ID)
Note

QC 20221104

Available from: 2022-11-04 Created: 2022-11-04 Last updated: 2024-03-15Bibliographically approved
Papadopoulos, K., Forslund, O. K., Nocerino, E., Johansson, F., Simutis, G., Matsubara, N., . . . Sassa, Y. (2022). Influence of the magnetic sublattices in the double perovskite LaCaNiReO6. Physical Review B, 106(21), Article ID 214410.
Open this publication in new window or tab >>Influence of the magnetic sublattices in the double perovskite LaCaNiReO6
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2022 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 106, no 21, article id 214410Article in journal (Refereed) Published
Abstract [en]

The magnetism of double perovskites is a complex phenomenon, determined from intra- or interatomic magnetic moment interactions, and strongly influenced by geometry. We take advantage of the complementary length and timescales of the muon spin rotation, relaxation, and resonance (mu+SR) microscopic technique and bulk ac/dc magnetic susceptibility measurements to study the magnetic phases of the LaCaNiReO6 double perovskite. As a result, we are able to discern and report ferrimagnetic ordering below TC = 102 K and the formation of different magnetic domains above TC. Between TC < T < 270 K, the following two magnetic environments appear, a dense spin region and a static-dilute spin region. The paramagnetic state is obtained only above T > 270 K. An evolution of the interaction between Ni and Re magnetic sublattices, in this geometrically frustrated fcc perovskite structure, is revealed as a function of temperature through the critical behavior and thermal evolution of microscopic and macroscopic physical quantities.

Place, publisher, year, edition, pages
American Physical Society (APS), 2022
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:kth:diva-323353 (URN)10.1103/PhysRevB.106.214410 (DOI)000901993200003 ()2-s2.0-85143683804 (Scopus ID)
Note

QC 20230127

Available from: 2023-01-27 Created: 2023-01-27 Last updated: 2023-12-07Bibliographically approved
Nocerino, E., Witteveen, C., Kobayashi, S., Forslund, O. K., Matsubara, N., Zubayer, A., . . . Månsson, M. (2022). Nuclear and magnetic spin structure of the antiferromagnetic triangular lattice compound LiCrTe2 investigated by μ+SR, neutron and X-ray diffraction. Scientific Reports, 12(1), Article ID 21657.
Open this publication in new window or tab >>Nuclear and magnetic spin structure of the antiferromagnetic triangular lattice compound LiCrTe2 investigated by μ+SR, neutron and X-ray diffraction
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2022 (English)In: Scientific Reports, E-ISSN 2045-2322, Vol. 12, no 1, article id 21657Article in journal (Refereed) Published
Abstract [en]

Two-dimensional (2D) triangular lattice antiferromagnets (2D-TLA) often manifest intriguing physical and technological properties, due to the strong interplay between lattice geometry and electronic properties. The recently synthesized 2-dimensional transition metal dichalcogenide LiCrTe2, being a 2D-TLA, enriched the range of materials which can present such properties. In this work, muon spin rotation (μ+SR) and neutron powder diffraction (NPD) have been utilized to reveal the true magnetic nature and ground state of LiCrTe2. From high-resolution NPD the magnetic spin order at base-temperature is not, as previously suggested, helical, but rather collinear antiferromagnetic (AFM) with ferromagnetic (FM) spin coupling within the ab-plane and AFM coupling along the c-axis. The value if the ordered magnetic Cr moment is established as μCr=2.36μB. From detailed μ+SR measurements we observe an AFM ordering temperature TN≈ 125 K. This value is remarkably higher than the one previously reported by magnetic bulk measurements. From μ+SR we are able to extract the magnetic order parameter, whose critical exponent allows us to categorize LiCrTe2 in the 3D Heisenberg AFM universality class. Finally, by combining our magnetic studies with high-resolution synchrotron X-ray diffraction (XRD), we find a clear coupling between the nuclear and magnetic spin lattices. This suggests the possibility for a strong magnon–phonon coupling, similar to what has been previously observed in the closely related compound LiCrO2.

Place, publisher, year, edition, pages
Springer Nature, 2022
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:kth:diva-328715 (URN)10.1038/s41598-022-25921-9 (DOI)001003026900008 ()36522382 (PubMedID)2-s2.0-85144152912 (Scopus ID)
Note

QC 20230610

Available from: 2023-06-10 Created: 2023-06-10 Last updated: 2023-12-07Bibliographically approved
Forslund, O. K., Andreica, D., Sassa, Y., Imai, M., Michioka, C., Yoshimura, K., . . . Månsson, M. (2022). Pressure driven magnetic order in Sr1-xCaxCo2P2. Scientific Reports, 12(1), Article ID 17526.
Open this publication in new window or tab >>Pressure driven magnetic order in Sr1-xCaxCo2P2
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2022 (English)In: Scientific Reports, E-ISSN 2045-2322, Vol. 12, no 1, article id 17526Article in journal (Refereed) Published
Abstract [en]

The magnetic phase diagram of Sr1-xCaxCo2P2 as a function of hydrostatic pressure and temperature is investigated by means of high pressure muon spin rotation, relaxation and resonance (mu+SR). The weak pressure dependence for the x not equal 1- compounds suggests that the rich phase diagram of Sr1-xCaxCo2P2 as a function of x at ambient pressure may not solely be attributed to chemical pressure effects. The x = 1 compound on the other hand reveals a high pressure dependence, where the long range magnetic order is fully suppressed at p(c2) approximate to 9.8 kbar, which seem to be a first order transition. In addition, an intermediate phase consisting of magnetic domains is formed above p(c1) approximate to 8 kbar where they co-exist with a magnetically disordered state. These domains are likely to be ferromagnetic islands (FMI) and consist of an high- (FMI-(1)) and low-temperature (FMI-(2)) region, respectively, separated by a phase boundary at T-i approximate to 20 K. This kind of co-existence is unusual and is originating from a coupling between lattice and magnetic degrees of freedoms.

Place, publisher, year, edition, pages
Springer Nature, 2022
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:kth:diva-321303 (URN)10.1038/s41598-022-21699-y (DOI)000870820900102 ()36266305 (PubMedID)2-s2.0-85140212445 (Scopus ID)
Note

QC 20221114

Available from: 2022-11-14 Created: 2022-11-14 Last updated: 2022-11-14Bibliographically approved
Forslund, O. K., Andreica, D., Ohta, H., Imai, M., Michioka, C., Yoshimura, K., . . . Sugiyama, J. (2021). Co-existence of short- and long-range magnetic order in LaCo2P2. Physica Scripta, 96(12), 125864
Open this publication in new window or tab >>Co-existence of short- and long-range magnetic order in LaCo2P2
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2021 (English)In: Physica Scripta, ISSN 0031-8949, E-ISSN 1402-4896, Vol. 96, no 12, p. 125864-Article in journal (Refereed) Published
Abstract [en]

The ferromagnetic (FM) nature of the metallic LaCo2P2 was investigated with the positive muon spin rotation, relaxation and resonance (μ+SR) technique. Transverse and zero field μ+ SR measurements revealed that the compound enters a long range FM ground state at   K, consistent with previous studies. Based on the reported FM structure, the internal magnetic field was computed at the muon sites, which were predicted with first principles calculations. The computed result agree well with the experimental data. Moreover, although LaCo2P2 is a paramagnet at higher temperatures T > 160 K, it enters a short range ordered (SRO) magnetic phase for   K. Measurements below the vicinity of   revealed that the SRO phase co-exists with the long range FM order at temperatures 124 K  . Such co-existence is an intrinsic property and may be explained by an interplay between spin and lattice degree of freedoms.

Place, publisher, year, edition, pages
IOP Publishing, 2021
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:kth:diva-305311 (URN)10.1088/1402-4896/ac3cf9 (DOI)000727019300001 ()2-s2.0-85123167606 (Scopus ID)
Funder
Swedish Research CouncilSwedish Foundation for Strategic Research
Note

QC 20211130

Available from: 2021-11-25 Created: 2021-11-25 Last updated: 2022-06-25Bibliographically approved
Sugiyama, J., Ohishi, K., Forslund, O. K., Månsson, M., Cottrell, S. P., Hillier, A. D. & Ishida, K. (2021). How Li diffusion in spinel Li[Ni1/2Mn3/2]O4 is seen with μ ±SR. Zeitschrift fur physikalische Chemie (Munchen. 1991), Article ID 20213102.
Open this publication in new window or tab >>How Li diffusion in spinel Li[Ni1/2Mn3/2]O4 is seen with μ ±SR
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2021 (English)In: Zeitschrift fur physikalische Chemie (Munchen. 1991), ISSN 0942-9352, article id 20213102Article in journal (Refereed) Published
Abstract [en]

The diffusive behavior in a spinel-type Li+ ion battery material, Li[Ni1/2Mn3/2]O4, has been studied with positive and negative muon spin rotation and relaxation (μ±SR) measurements in the temperature range between 200 and 400 K using a powder sample. The implanted μ+ locates at an interstitial site near O2- ion so as to form a O-H like bond, while the implanted μ- is mainly captured by an oxygen nucleus, resulting in the formation of muonic oxygen. This means that local magnetic environments in Li[Ni1/2Mn3/2]O4 were investigated from the two different sites in the lattice, i.e., one is an interstitial site for μ+SR and the other is an oxygen site for μ-SR. Since both μ+SR and μ-SR detected an increase in the fluctuation rate of a nuclear magnetic field for temperatures above 200 K, the origin of this increase is clearly confirmed as Li diffusion. Assuming a random walk process with the hopping of thermally activated Li+ between a regular Li site and the nearest neighboring vacant octahedral sites, a self-diffusion coefficient of Li+ was found to range above 10-11 cm2/s at temperatures above 250 K with an activation energy of about 0.06 eV.

Place, publisher, year, edition, pages
Walter de Gruyter GmbH, 2021
Keywords
Physical and Theoretical Chemistry
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:kth:diva-305209 (URN)10.1515/zpch-2021-3102 (DOI)000744114900001 ()2-s2.0-85115659129 (Scopus ID)
Note

QC 20211210

Available from: 2021-11-23 Created: 2021-11-23 Last updated: 2022-09-23Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0001-8879-7875

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