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Structural Evolution and Onset of the Density Wave Transition in the CDW Superconductor LaPt2Si2 Clarified with Synchrotron XRD
KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.ORCID iD: 0000-0003-4441-8882
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Engineering.ORCID iD: 0000-0001-5613-3468
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

The quasi-2D Pt-based rare earth intermetallic material LaPt2Si2 has attracted attention as it exhibits strong interplay between charge density wave (CDW) and and superconductivity (SC). However, the most of the results reported on this material come from theoretical calculations, preliminary bulk investigations and powder samples, which makes it difficult to uniquely determine the temperature evolution of its crystal structure and, consequently, of its CDW transition. Therefore, the published literature around LaPt2Si2 is often controversial. In this paper, we clarify the complex evolution of the crystal structure, and the temperature dependence of the development of density wave transitions, in good quality LaPt2Si2 single crystals, with high resolution synchrotron X-ray diffraction data. According to our findings, on cooling from room temperature LaPt2Si2 undergoes a series of subtle structural transitions which can be summarised as follows: second order commensurate tetragonal (P4/nmm)-to-incommensurate structure followed by a first order incommensurate-to-commensurate orthorhombic (Pmmn) transition and then a first order commensurate orthorhombic (Pmmn)-to-commensurate tetragonal (P4/nmm). The structural transitions are accompanied by both incommensurate and commensurate superstructural distortions of the lattice. The observed behavior is compatible with discommensuration of the CDW in this material. 

National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:kth:diva-321708DOI: 10.48550/arXiv.2211.12617OAI: oai:DiVA.org:kth-321708DiVA, id: diva2:1712384
Note

Published in Communications Materials DOI: 10.1038/s43246-023-00406-y

QC 20221129

Available from: 2022-11-21 Created: 2022-11-21 Last updated: 2024-02-05Bibliographically 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
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Available from: 2022-11-28 Created: 2022-11-28 Last updated: 2023-12-07Bibliographically approved

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Nocerino, ElisabettaPapadopoulos, KonstantinosHossain, ZakirMånsson, Martin

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