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Q-dependent electron-phonon coupling induced phonon softening and non-conventional critical behavior in the CDW superconductor LaPt2Si2

Nocerino, Elisabetta (författare)
KTH,Material- och nanofysik
Stuhr, U. (författare)
Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
San Lorenzo, I. (författare)
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 Materials Structure Science, High Energy Accelerator Research Organization, Ibaraki 305-0801, Japan
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Mazza, F. (författare)
Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstrasse 8-10, 1040 Vienna, Austria, Wiedner Hauptstraße 8–10
Mazzone, D. G. (författare)
Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
Hellsvik, Johan (författare)
Stockholms universitet,KTH,Nordic Institute for Theoretical Physics NORDITA,Parallelldatorcentrum, PDC,Nordiska institutet för teoretisk fysik (Nordita),KTH Royal Institute of Technology, Sweden
Hasegawa, S. (författare)
Neutron Science Laboratory, Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
Asai, S. (författare)
Neutron Science Laboratory, Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
Masuda, T. (författare)
Neutron Science Laboratory, Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan, Chiba; Trans-scale Quantum Science Institute, The University of Tokyo, Tokyo 113-0033, Japan; Institute of Materials Structure Science, High Energy Accelerator Research Organization, Ibaraki 305-0801, Japan
Itoh, S. (författare)
Institute of Materials Structure Science, High Energy Accelerator Research Organization, Ibaraki 305-0801, Japan
Minelli, A. (författare)
Inorganic Chemistry Laboratory, University of Oxford, Oxford OX1 3QR, United Kingdom
Hossain, Z. (författare)
Department of Physics, Indian Institute of Technology, Kanpur 208016, India
Thamizhavel, A. (författare)
DCMPMS, Tata Institute of Fundamental Research, Mumbai 400005, India
Lefmann, K. (författare)
Nanoscience Center, Niels Bohr Institute, University of Copenhagen, Noerre Alle 59, DK-2100 Copenhagen O, Denmark
Sassa, Y. (författare)
Department of Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden
Månsson, Martin, As. Prof. 1976- (författare)
KTH,Material- och nanofysik
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 (creator_code:org_t)
Elsevier BV, 2023
2023
Engelska.
Ingår i: Journal of Science: Advanced Materials and Devices. - : Elsevier BV. - 2468-2284 .- 2468-2179. ; 8:4
Relaterad länk:
https://doi.org/10.1...
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https://urn.kb.se/re...
https://doi.org/10.1...
https://urn.kb.se/re...
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  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
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  • 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.

Ämnesord

NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

Nyckelord

CDW discommensuration
Charge density wave
Inelastic neutron scattering
Phonon softening
Unconventional superconductivity

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