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Pressure dependence of ferromagnetic phase boundary in BaVSe3 studied with high-pressure mu+SR
Comprehens Res Org Sci & Soc CROSS, Neutron Sci & Technol Ctr, Tokai, Ibaraki 3191106, Japan.;Japan Atom Energy Agcy, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan.;High Energy Accelerator Res Org KEK, Tokai, Ibaraki 3191106, Japan..ORCID iD: 0000-0002-0916-5333
Japan Atom Energy Agcy, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan..
Babes Bolyai Univ, Fac Phys, Cluj Napoca 400084, Romania..
KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.ORCID iD: 0000-0001-8879-7875
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2021 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 103, no 10, article id 104418Article in journal (Refereed) Published
Abstract [en]

The magnetic nature of a quasi-one-dimensional compound, BaVSe3, has been investigated with positive muon spin rotation and relaxation (mu+SR) measurements at ambient and high pressures. At ambient pressure, the mu+SR spectrum recorded under zero external magnetic field exhibited a clear oscillation below the Curie temperature (T-C similar to 41 K) due to the formation of quasistatic ferromagnetic order. The oscillation consisted of two different muon spin precession signals, indicating the presence of two magnetically different muon sites in the lattice. However, the two precession frequencies, which correspond to the internal magnetic fields at the two muon sites, could not be adequately explained with relatively simple ferromagnetic structures using the muon sites predicted by density functional theory calculations. The detailed analysis of the internal magnetic field suggested that the V moments align ferromagnetically along the c axis but slightly canted toward the a axis by 28 degrees that is coupled antiferromagnetically. The ordered V moment (M-v) is estimated as (0.59, 0, 1.11) mu(B). As pressure increased from ambient pressure, T-C was found to decrease slightly up to about 1.5 GPa, at which point T-C started to increase rapidly with the further increase of the pressure. Based on a strong ferromagnetic interaction along the c axis, the high-pressure mu+SR result revealed that there are two magnetic interactions in the ab plane; one is an antiferromagnetic interaction that is enhanced with pressure, mainly at pressures below 1.5 GPa, while the other is a ferromagnetic interaction that becomes predominant at pressures above 1.5 GPa.

Place, publisher, year, edition, pages
American Physical Society (APS) , 2021. Vol. 103, no 10, article id 104418
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:kth:diva-296115DOI: 10.1103/PhysRevB.103.104418ISI: 000646533200002Scopus ID: 2-s2.0-85102858228OAI: oai:DiVA.org:kth-296115DiVA, id: diva2:1559032
Note

QC 20210601

Available from: 2021-06-01 Created: 2021-06-01 Last updated: 2023-12-07Bibliographically approved
In thesis
1. 1D to 3D Magnetism in Quantum Materials: A study by Muons, Neutrons & X-rays
Open this publication in new window or tab >>1D to 3D Magnetism in Quantum Materials: A study by Muons, Neutrons & X-rays
2021 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

A collection of works stretching from low- to three-dimensional magnetism are presented, studied mostly through muon spin rotation, relaxation and resonance (µ +SR). The theoretical background of this technique is outlined in Chapter 2, which introduces the subject from the muon particle as an astro[1]nomical particle to how they are produced here on Earth. Given the specific properties of weak particle interactions, previous generations of scientists developed the technique of µ +SR. Special care is taken to explain how the anti-muon interacts with magnetic fields and the resulting behaviour of the anti-muon in a given magnetic field configuration. The fundamental principle of µ +SR is to interpret the resulting muon behaviour in order to unveil microscopic details of the compounds of interest. Other experimental techniques were utilised to confirm the assessment made by µ +SR and to probe different aspects of the compounds being studied. Specifically, neutron and X-ray scattering were performed; the corresponding theoretical background is presented in Chapter 4. Interpretations, conclusions and discussions regarding the studied compounds are presented in Chapter 5. This chapter is divided into four parts depending on the study: one-dimensional (1D), two-dimensional (2D) and three-dimensional (3D) magnets and studies related to µ +SR in general. The 1D compounds comprise mostly samples within the Hollandite family, which exhibit quasi-1D chains of transition metal ions. These chains may in certain cases facilitate interactions in a 1D fashion, which is a very interesting feature. In particular, a quantum spin liquid phase is found in one of the compounds, stabilised by a peculiar form of charge ordering occurring at high temperature. Microscopic evidence for the absence of a Peierls transition in a ferromagnetic metal-insulator transition compound is presented as well. The 2D compounds include layer-structured samples in which intralayer interactions are assumed to be dominant. Interestingly, the ground state was found to not be governed only by the intralayer interactions, at least in one of the compounds. Instead, the charge distribution in between the layers seems to have a role to play, as the specific cation ordering determined the ground state. A study in which this distribution is changed to study its effect on the ground state is presented. The 3D magnets considered here exhibit unique interactions available in these compounds. Complicated phases emerge above the transition temperature due to modulation of interactions in space. Finally, a collection of interesting studies related to general µ +SR are included in Chapter 5. These include a study of lithium ion diffusion anisotropy detected for the first time by µ +SR and a semantical discussion related to the term muonium. Other studies not related to this thesis are listed in Articles not included in this thesis. This thesis concludes with Chapter 6, which briefly summarises the work and the resulting outcomes. Most importantly, a smaller discussion on the future of physics is presented, considering its implications for society and science as a whole.

Place, publisher, year, edition, pages
Stockholm: Kungliga tekniska högskolan, 2021. p. 137
Series
TRITA-SCI-FOU ; 2021:50
Keywords
muon, magnetism, scattering, quantum materials
National Category
Condensed Matter Physics
Research subject
Physics, Material and Nano Physics
Identifiers
urn:nbn:se:kth:diva-305313 (URN)978-91-8040-081-7 (ISBN)
Public defence
2021-12-17, Rum Cesium, Hus 3 https://kth-se.zoom.us/j/68459929158, Albano Campus, Stockholm, 16:00 (English)
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Available from: 2021-11-26 Created: 2021-11-25 Last updated: 2022-06-25Bibliographically approved

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Forslund, Ola KenjiNocerino, ElisabettaMånsson, Martin

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