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BETA
Månsson, Martin, As. Prof.ORCID iD iconorcid.org/0000-0002-3086-9642
Publications (10 of 19) Show all publications
Duan, Y.-X., Zhang, C., Rusz, J., Oppeneer, P. M., Durakiewicz, T., Sassa, Y., . . . Meng, J.-Q. (2019). Crystal electric field splitting and f-electron hybridization in heavy-fermion CePt2In7. Physical Review B, 100(8), Article ID 085141.
Open this publication in new window or tab >>Crystal electric field splitting and f-electron hybridization in heavy-fermion CePt2In7
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2019 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 100, no 8, article id 085141Article in journal (Refereed) Published
Abstract [en]

We use high-resolution angle-resolved photoemission spectroscopy to investigate the electronic structure of the antiferromagnetic heavy fermion compound CePt2In7, which is amember of the CeIn3-derived heavy fermion material family. Weak hybridization among 4f electron states and conduction bands was identified in CePt2In7 at low temperature much weaker than that in the other heavy fermion compounds like CeIrIn5 and CeRhIn5. The Ce 4f spectrum shows fine structures near the Fermi energy, reflecting the crystal electric field splitting of the 4f(5/2)(1) and 4f(7/2)(1) states. Also, we find that the Fermi surface has a strongly three-dimensional topology, in agreement with density-functional theory calculations.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC, 2019
National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-259442 (URN)10.1103/PhysRevB.100.085141 (DOI)000482582200008 ()
Note

QC 20190923

Available from: 2019-09-23 Created: 2019-09-23 Last updated: 2019-09-23Bibliographically approved
Sugiyama, J., Umegaki, I., Matsumoto, M., Miwa, K., Nozaki, H., Higuchi, Y., . . . Brewer, J. H. (2019). Desorption reaction in MgH 2 studied with in situ μ + SR. Sustainable Energy and Fuels, 3(4), 956-964
Open this publication in new window or tab >>Desorption reaction in MgH 2 studied with in situ μ + SR
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2019 (English)In: Sustainable Energy and Fuels, ISSN 2398-4902, Vol. 3, no 4, p. 956-964Article in journal (Refereed) Published
Abstract [en]

In order to study the mechanism determining the desorption temperature (T d ) of hydrogen storage materials, we have measured positive muon spin rotation and relaxation (μ + SR) in MgH 2 over a wide temperature range including its T d . The pressure in the sample cell due to desorbed H 2 was measured in parallel with the μ + SR measurements under static conditions. Such in situ μ + SR measurements revealed that hydrogen starts to diffuse in MgH 2 well below T d . This indicates the important role of hydrogen diffusion in accelerating the desorption reaction by removing the reaction product, i.e. H 2 , from the reaction system.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2019
National Category
Other Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-251906 (URN)10.1039/c8se00568k (DOI)000467219500019 ()2-s2.0-85063419615 (Scopus ID)
Note

QC 20190527

Available from: 2019-05-27 Created: 2019-05-27 Last updated: 2019-05-29Bibliographically approved
Kobayashi, S., Katayama, N., Manjo, T., Ueda, H., Michioka, C., Sugiyama, J., . . . Sawa, H. (2019). Linear Trimer Formation with Antiferromagnetic Ordering in 1T-CrSe2 Originating from Peierls-like Instabilities and Interlayer Se-Se Interactions. Inorganic Chemistry, 58(21), 14304-14315
Open this publication in new window or tab >>Linear Trimer Formation with Antiferromagnetic Ordering in 1T-CrSe2 Originating from Peierls-like Instabilities and Interlayer Se-Se Interactions
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2019 (English)In: Inorganic Chemistry, ISSN 0020-1669, E-ISSN 1520-510X, Vol. 58, no 21, p. 14304-14315Article in journal (Refereed) Published
Abstract [en]

Anomalous successive structural transitions in layered 1T-CrSe2 with an unusual Cr4+ valency were investigated by synchrotron X-ray diffraction. 1T-CrSe2 exhibits dramatic structural changes in in-plane Cr-Cr and interlayer Se-Se distances, which originate from two interactions: (i) in-plane Cr-Cr interactions derived from Peierls-like trimerization instabilities on the orbitally assisted one-dimensional chains and (ii) interlayer Se-Se interactions through p-p hybridization. As a result, 1T-CrSe2 has the unexpected ground state of an antiferromagnetic metal with multiple Cr linear trimers with three-center-two-electron sigma bonds. Interestingly, partial substitution of Se for S atoms in 1T-CrSe2 changes the ground state from an antiferromagnetic metal to an insulator without long-range magnetic ordering, which is due to the weakening of interlayer interactions between anions. The unique low-temperature structures and electronic states of this system are determined by the competition and cooperation of in-plane Cr-Cr and interlayer Se-Se interactions.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC, 2019
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-264337 (URN)10.1021/acs.inorgchem.9b00186 (DOI)000494894400005 ()30964663 (PubMedID)2-s2.0-85064759165 (Scopus ID)
Note

QC 20191126

Available from: 2019-11-26 Created: 2019-11-26 Last updated: 2019-11-26Bibliographically approved
Forslund, O. K., Andreica, D., Sassa, Y., Nozaki, H., Umegaki, I., Nocerino, E., . . . Månsson, M. (2019). Magnetic phase diagram of K 2 Cr 8 O 16 clarified by high-pressure muon spin spectroscopy. Scientific Reports, 9(1), Article ID 1141.
Open this publication in new window or tab >>Magnetic phase diagram of K 2 Cr 8 O 16 clarified by high-pressure muon spin spectroscopy
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2019 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 9, no 1, article id 1141Article in journal (Refereed) Published
Abstract [en]

The K 2 Cr 8 O 16 compound belongs to a series of quasi-1D compounds with intriguing magnetic properties that are stabilized through a high-pressure synthesis technique. In this study, a muon spin rotation, relaxation and resonance (μ + SR) technique is used to investigate the pressure dependent magnetic properties up to 25 kbar. μ + SR allows for measurements in true zero applied field and hereby access the true intrinsic material properties. As a result, a refined temperature/pressure phase diagram is presented revealing a novel low temperature/high pressure (p C1 = 21 kbar) transition from a ferromagnetic insulating to a high-pressure antiferromagnetic insulator. Finally, the current study also indicates the possible presence of a quantum critical point at p C2 ~ 33 kbar where the magnetic order in K 2 Cr 8 O 16 is expected to be fully suppressed even at T = 0 K.

Place, publisher, year, edition, pages
Nature Publishing Group, 2019
National Category
Other Engineering and Technologies
Identifiers
urn:nbn:se:kth:diva-246400 (URN)10.1038/s41598-018-37844-5 (DOI)000457616300030 ()30718649 (PubMedID)2-s2.0-85061061260 (Scopus ID)
Note

QC 20190401

Available from: 2019-04-01 Created: 2019-04-01 Last updated: 2019-04-01Bibliographically approved
Benedek, P., Yazdani, N., Chen, H., Wenzler, N., Juranyi, F., Månsson, M., . . . Wood, V. C. (2019). Surface phonons of lithium ion battery active materials. SUSTAINABLE ENERGY & FUELS, 3(2), 508-513
Open this publication in new window or tab >>Surface phonons of lithium ion battery active materials
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2019 (English)In: SUSTAINABLE ENERGY & FUELS, ISSN 2398-4902, Vol. 3, no 2, p. 508-513Article in journal (Refereed) Published
Abstract [en]

Surfaces of active materials are understood to play an important role in the performance and lifetime of lithium-ion batteries, but they remain poorly characterized and therefore cannot yet be systematically designed. Here, we combine inelastic neutron scattering and ab initio simulations to demonstrate that the structure of the surface of active materials differs from the interior of the particle. We use LiFePO4 (LFP) as a model system, and we find that carbon coating influences the Li-O bonding on the (010) LFP surface relative to the bulk. Our results highlight how coatings can be used to systematically engineer the vibrations of atoms at the surface of battery active materials, and thereby impact lithium ion transport, charge transfer, and surface reactivity.

Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY, 2019
National Category
Other Chemistry Topics
Identifiers
urn:nbn:se:kth:diva-244533 (URN)10.1039/c8se00389k (DOI)000457548700015 ()2-s2.0-85060780741 (Scopus ID)
Note

QC 20190403

Available from: 2019-04-03 Created: 2019-04-03 Last updated: 2019-04-03Bibliographically approved
Faure, Q., Takayoshi, S., Simonet, V., Grenier, B., Månsson, M., White, J. S., . . . Petit, S. (2019). Tomonaga-Luttinger Liquid Spin Dynamics in the Quasi-One-Dimensional Ising-Like Antiferromagnet BaCo2V2O8. Physical Review Letters, 123(2), Article ID 027204.
Open this publication in new window or tab >>Tomonaga-Luttinger Liquid Spin Dynamics in the Quasi-One-Dimensional Ising-Like Antiferromagnet BaCo2V2O8
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2019 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 123, no 2, article id 027204Article in journal (Refereed) Published
Abstract [en]

Combining inelastic neutron scattering and numerical simulations, we study the quasi-one-dimensional Ising anisotropic quantum antiferromagnet BaCo2V2O8 in a longitudinal magnetic field. This material shows a quantum phase transition from a Neel ordered phase at zero field to a longitudinal incommensurate spin density wave at a critical magnetic field of 3.8 T. Concomitantly, the excitation gap almost closes and a fundamental reconfiguration of the spin dynamics occurs. These experimental results are well described by the universal Tomonaga-Luttinger liquid theory developed for interacting spinless fermions in one dimension. We especially observe the rise of mainly longitudinal excitations, a hallmark of the unconventional low-field regime in Ising-like quantum antiferromagnetic chains.

Place, publisher, year, edition, pages
American Physical Society, 2019
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-255377 (URN)10.1103/PhysRevLett.123.027204 (DOI)000474895000020 ()
Note

QC 20190731

Available from: 2019-07-31 Created: 2019-07-31 Last updated: 2019-07-31Bibliographically approved
Matt, C. E., Sutter, D., Cook, A. M., Sassa, Y., Månsson, M., Tjernberg, O., . . . Chang, J. (2018). Direct observation of orbital hybridisation in a cuprate superconductor. Nature Communications, 9, Article ID 972.
Open this publication in new window or tab >>Direct observation of orbital hybridisation in a cuprate superconductor
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2018 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 9, article id 972Article in journal (Refereed) Published
Abstract [en]

The minimal ingredients to explain the essential physics of layered copper-oxide (cuprates) materials remains heavily debated. Effective low-energy single-band models of the copper-oxygen orbitals are widely used because there exists no strong experimental evidence supporting multi-band structures. Here, we report angle-resolved photoelectron spectroscopy experiments on La-based cuprates that provide direct observation of a two-band structure. This electronic structure, qualitatively consistent with density functional theory, is parametrised by a two-orbital (d(x2-y2) and d(z2)) tight-binding model. We quantify the orbital hybridisation which provides an explanation for the Fermi surface topology and the proximity of the van-Hove singularity to the Fermi level. Our analysis leads to a unification of electronic hopping parameters for single-layer cuprates and we conclude that hybridisation, restraining d-wave pairing, is an important optimisation element for superconductivity.

Place, publisher, year, edition, pages
Nature Publishing Group, 2018
National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-224679 (URN)10.1038/s41467-018-03266-0 (DOI)000426660300004 ()29511188 (PubMedID)2-s2.0-85043230277 (Scopus ID)
Funder
Swedish Research Council, dnr.2016-06955Knut and Alice Wallenberg Foundation
Note

QC 20180326

Available from: 2018-03-26 Created: 2018-03-26 Last updated: 2018-03-26Bibliographically approved
Nozaki, H., Sakurai, H., Ofer, O., Ansaldo, E. J., Brewer, J. H., Chow, K. H., . . . Sugiyama, J. (2018). Magnetic structure for NaCr2O4 analyzed by neutron diffraction and muon spin-rotation. Paper presented at 11th International Conference on Neutron Scattering (ICNS), JUL 09-13, 2017, Daejeon, SOUTH KOREA. Physica. B, Condensed matter, 551, 137-141
Open this publication in new window or tab >>Magnetic structure for NaCr2O4 analyzed by neutron diffraction and muon spin-rotation
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2018 (English)In: Physica. B, Condensed matter, ISSN 0921-4526, E-ISSN 1873-2135, Vol. 551, p. 137-141Article in journal (Refereed) Published
Abstract [en]

We have investigated the magnetic ground state of a novel one-dimensional compound, NaCr2O4, in which Cr2O4 double chains, i.e. zig-zag chains are aligned parallel to the b-axis, by means of both muon-spin rotation and relaxation (mu+SR) and neutron diffraction (ND) measurements. The mu+SR results reveal the formation of static antiferromagnetic order below Neel temperature (T-N = 124 K). The ND measurements also demonstrate the appearance of magnetic Bragg peaks with the propagation vector (k) over right arrow = (1, 0, 1) below T-N. Combined analyses of the mu+SR and ND data clarify that the Cr moments in each zig-zag chain are aligned ferromagnetically along the c-axis, whereas antiferromagnetically along the alpha-axis between the adjacent zig-zag chains.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV, 2018
Keywords
Chromium oxide, Magnetic structure, Muon-spin rotation, Neutron diffraction
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-241331 (URN)10.1016/j.physb.2017.11.011 (DOI)000455012800031 ()2-s2.0-85044754565 (Scopus ID)
Conference
11th International Conference on Neutron Scattering (ICNS), JUL 09-13, 2017, Daejeon, SOUTH KOREA
Note

QC 20190121

Available from: 2019-01-21 Created: 2019-01-21 Last updated: 2019-01-21Bibliographically approved
Sugiyama, J., Nozaki, H., Umegaki, I., Miwa, K., Higemoto, W., Ansaldo, E. J., . . . Månsson, M. (2018). Magnetism of the A-site ordered perovskites CaCu3Cr4O12 and LaCu3Cr4O12. Physical Review B, 97(2), Article ID 024416.
Open this publication in new window or tab >>Magnetism of the A-site ordered perovskites CaCu3Cr4O12 and LaCu3Cr4O12
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2018 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 97, no 2, article id 024416Article in journal (Refereed) Published
Abstract [en]

The microscopic magnetic nature of the A-site ordered chromium perovskites CaCu3Cr4O12 and LaCu3Cr4O12 and their solid-solution system, Ca1-x LaxCu3Cr4O12, with x = 0.2, 0.4, and 0.8, has been studied with muon spin rotation and relaxation (mu+SR) measurements down to 2 K using a powder sample. For CaCu3Cr4O12, mu+SR revealed the formation of static antiferromagnetic (AF) order below 122 K (=T-N), although magnetization measurements showed a very small change at T-N. Analyses of the internal magnetic field H-int at the muon sites, predicted with first-principles calculations, suggested G-type AF order as a ground state. For LaCu3Cr4O12 with T-N = 225 K, mu+SR also supported the presence of aG-type AF ordered state, which was recently proposed based on neutron diffraction measurements. However, the ordered Cr moments were found to change the direction at around 10 K. For Ca1-xLaxCu3Cr4O12, both T-N and H-int at 2 K increase monotonically with x.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC, 2018
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-222183 (URN)10.1103/PhysRevB.97.024416 (DOI)000423120900003 ()2-s2.0-85040907232 (Scopus ID)
Note

QC 20180205

Available from: 2018-02-05 Created: 2018-02-05 Last updated: 2018-02-05Bibliographically approved
Gao, S., Guratinder, K., Stuhr, U., White, J. S., Månsson, M., Roessli, B., . . . Zaharko, O. (2018). Manifolds of magnetic ordered states and excitations in the almost Heisenberg pyrochlore antiferromagnet MgCr2 O4. Physical Review B, 97(13), Article ID 134430.
Open this publication in new window or tab >>Manifolds of magnetic ordered states and excitations in the almost Heisenberg pyrochlore antiferromagnet MgCr2 O4
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2018 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 97, no 13, article id 134430Article in journal (Refereed) Published
Abstract [en]

In spinels ACr2O4(A=Mg, Zn), realization of the classical pyrochlore Heisenberg antiferromagnet model is complicated by a strong spin-lattice coupling: the extensive degeneracy of the ground state is lifted by a magneto-structural transition at TN=12.5 K. We study the resulting low-temperature low-symmetry crystal structure by synchrotron x-ray diffraction. The consistent features of x-ray low-temperature patterns are explained by the tetragonal model of Ehrenberg et al. [Pow. Diff. 17, 230 (2002)PODIE20885-715610.1154/1.1479738], while other features depend on sample or cooling protocol. A complex, partially ordered magnetic state is studied by neutron diffraction and spherical neutron polarimetry. Multiple magnetic domains of configuration arms of the propagation vectors k1=(12120),k2=(1012) appear. The ordered moment reaches 1.94(3) μB/Cr3+ for k1 and 2.08(3) μB/Cr3+ for k2, if equal amount of the k1 and k2 phases is assumed. The magnetic arrangements have the dominant components along the [110] and [1-10] diagonals and a smaller c component. We use inelastic neutron scattering to investigate the spin excitations, which comprise a mixture of dispersive spin waves propagating from the magnetic Bragg peaks and resonance modes centered at equal energy steps of 4.5 meV. We interpret these as acoustic and optical spin wave branches, but show that the neutron scattering cross sections of transitions within a unit of two corner-sharing tetrahedra match the observed intensity distribution of the resonances. The distinctive fingerprint of clusterlike excitations in the optical spin wave branches suggests that propagating excitations are localized by the complex crystal structure and magnetic orders.

Place, publisher, year, edition, pages
American Physical Society, 2018
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-228926 (URN)10.1103/PhysRevB.97.134430 (DOI)000431973400004 ()2-s2.0-85046956367 (Scopus ID)
Note

QC 20180530

Available from: 2018-05-30 Created: 2018-05-30 Last updated: 2018-06-19Bibliographically approved
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-3086-9642

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