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Q-dependent electron-phonon coupling induced phonon softening and non-conventional critical behavior in the CDW superconductor LaPt2Si2
KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.ORCID iD: 0000-0003-4441-8882
Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland.
Nanoscience Center, Niels Bohr Institute, University of Copenhagen, Noerre Alle 59, DK-2100 Copenhagen O, Denmark, Nørre Allé 59; Department of Applied Science and Technology, Politecnico di Torino, corso Duca degli abruzzi 24 10129 Torino, Italy.
Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstrasse 8-10, 1040 Vienna, Austria, Wiedner Hauptstraße 8–10.
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2023 (English)In: Journal of Science: Advanced Materials and Devices, ISSN 2468-2284, Vol. 8, no 4, article id 100621Article in journal (Refereed) Published
Abstract [en]

This paper reports the first experimental observation of phonons and their softening on single crystalline LaPt2Si2 via inelastic neutron scattering. From the temperature dependence of the phonon frequency in close proximity to the charge density wave (CDW) q-vector, we obtain a CDW transition temperature of TCDW = 230 K and a critical exponent β = 0.28 ± 0.03. This value is suggestive of a non-conventional critical behavior for the CDW phase transition in LaPt2Si2, compatible with a scenario of CDW discommensuration (DC). The DC would be caused by the existence of two CDWs in this material, propagating separately in the non equivalent (Si1–Pt2–Si1) and (Pt1–Si2–Pt1) layers, respectively, with transition temperatures TCDW−1 = 230 K and TCDW−2 = 110 K. A strong q-dependence of the electron-phonon coupling has been identified as the driving mechanism for the CDW transition at TCDW−1 = 230 K while a CDW with 3-dimensional character, and Fermi surface quasi-nesting as a driving mechanism, is suggested for the transition at TCDW−2 = 110 K. Our results clarify some aspects of the CDW transition in LaPt2Si2 which have been so far misinterpreted by both theoretical predictions and experimental observations and give direct insight into its actual temperature dependence.

Place, publisher, year, edition, pages
Elsevier BV , 2023. Vol. 8, no 4, article id 100621
Keywords [en]
CDW discommensuration, Charge density wave, Inelastic neutron scattering, Phonon softening, Unconventional superconductivity
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:kth:diva-336308DOI: 10.1016/j.jsamd.2023.100621ISI: 001147608200001Scopus ID: 2-s2.0-85169506032OAI: oai:DiVA.org:kth-336308DiVA, id: diva2:1796845
Note

QC 20240209

Available from: 2023-09-13 Created: 2023-09-13 Last updated: 2024-02-09Bibliographically approved

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Nocerino, ElisabettaHellsvik, JohanMånsson, Martin

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Materials and NanophysicsNordic Institute for Theoretical Physics NORDITACentre for High Performance Computing, PDC
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