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Neutron powder diffraction study of NaMn2O4 and Li0.92Mn2O4 : Insights on spin-charge-orbital ordering
KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.ORCID iD: 0000-0002-8324-710x
KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.ORCID iD: 0000-0003-4441-8882
KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.ORCID iD: 0000-0001-8879-7875
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2020 (English)In: Physical Review Research, E-ISSN 2643-1564, Vol. 2, no 4, article id 043143Article in journal (Refereed) Published
Abstract [en]

High-pressure synthesized quasi-one-dimensional NaMn2O4 and Li0.92Mn2O4 are both antiferromagnetic insulators. Here their atomic and magnetic structures are investigated using neutron powder diffraction. The present crystal structural analyses of NaMn2O4 reveal that a Mn3+/Mn4+ charge-ordering state exists even at low temperature (down to 1.5 K). It is evident that one of the Mn sites shows a strongly distorted Mn3+ octahedron due to the Jahn-Teller effect. Above TN=35 K, a two-dimensional short-range correlation is observed, as indicated by asymmetric diffuse scattering. Below TN, two antiferromagnetic transitions are observed: (i) a commensurate long-range Mn3+ spin ordering below TN1=35 K and (ii) an incommensurate Mn4+ spin ordering below TN2=11 K. Surprisingly, the two antiferromagnetic orders are found to be independent of each other. The commensurate magnetic structure (kC=0.5,0.5,0.5) follows the magnetic anisotropy of the local easy axes of Mn3+, while the incommensurate Mn4+ one shows a spin-density-wave or a cycloidal order with kIC=(0,0,0.216). For Li0.92Mn2O4, on the other hand, the absence of a long-range spin-ordered state is confirmed down to 1.5 K.

Place, publisher, year, edition, pages
American Physical Society (APS) , 2020. Vol. 2, no 4, article id 043143
Keywords [en]
Binary alloys; Crystal atomic structure; Crystallography; Density (optical); Magnetic anisotropy; Magnetic structure; Neutron powder diffraction; Spin density waves; Temperature
National Category
Natural Sciences Inorganic Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-321681DOI: 10.1103/physrevresearch.2.043143ISI: 000605400600002Scopus ID: 2-s2.0-85115906902OAI: oai:DiVA.org:kth-321681DiVA, id: diva2:1712326
Funder
Swedish Foundation for Strategic ResearchSwedish Research Council, 2016-06955Swedish Research Council, 201705078Swedish Foundation for Strategic ResearchSwedish Research Council, 2016-06955Swedish Research Council, 201705078Swedish Foundation for Strategic ResearchSwedish Research Council, 2016-06955Swedish Research Council, 201705078
Note

QC 20221124

Available from: 2022-11-21 Created: 2022-11-21 Last updated: 2023-12-07Bibliographically approved
In thesis
1. A Comprehensive Experimental Approach to Multifunctional Quantum Materials and their Physical Properties: Geometry and Physics in Condensed Matter
Open this publication in new window or tab >>A Comprehensive Experimental Approach to Multifunctional Quantum Materials and their Physical Properties: Geometry and Physics in Condensed Matter
2022 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis ranges within the vast framework of experimental condensed matter physics. Several different systems, and physical phenomena, are presented here from a structuralist standpoint. In fact, we show how, in solid condensed matter, the underlying arrangement of atoms, the symmetry of their structure, and their mutual interactions, underpin the form and the nature of their collective emergent properties. Our effort in this work was focused on unveiling complex magnetic ground states in newly synthesized materials, as well as in the clarification of unconventional symmetry breaking phenomena in highly debated systems. In all cases, we could understand the physics of such systems only when we elucidated the details, and temperature dependent evolution, of their structures.

About the choice of target materials for our investigations, our starting point has not only been fundamental condensed matter physics, but also forward looking towards a sustainable future. Here we considered both the development of energy efficient spintronics and quantum computing, as well as the need for efficient conversion and storage of clean energy. Therefore, this project is concerned with the advanced characterization of novel ”multifunctional” materials, that constitute a unique playground for fundamental scientific research, but also lend themselves to potential novel technical applications. Such materials might indeed display high temperature dynamical properties, which make them suitable for rechargeable batteries and heat conduction applications. At the same time, they are also strongly correlated electron systems at lower temperatures, and their fundamental magnetic and electronic properties are relevant for the development of quantum devices. To explore these properties, extensive experimental studies using large-scale research facilities were employed. In this project, several unique and powerful state-of-the-art high-resolution neutron scattering, X-ray scattering, and muon spin rotation techniques were used.

Place, publisher, year, edition, pages
Stockholm: Kungliga Tekniska högskolan, 2022. p. 137
Series
TRITA-SCI-FOU ; 2022:58
Keywords
quantum materials, neutron, muon, X-ray, symmetry, phase transitions
National Category
Condensed Matter Physics
Research subject
Physics, Material and Nano Physics
Identifiers
urn:nbn:se:kth:diva-321992 (URN)978-91-8040-420-4 (ISBN)
Public defence
2022-12-19, (Room 4204), Hannes Alfvéns väg 12, vån. 4, Alba Nova, KTH, Stockholm, 13:00 (English)
Opponent
Supervisors
Available from: 2022-11-28 Created: 2022-11-28 Last updated: 2023-12-07Bibliographically approved

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Matsubara, NamiNocerino, ElisabettaForslund, Ola KenjiMånsson, Martin

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