TY - JOUR

T1 - Pressure-Induced Reversible Local Structural Disorder in Superconducting AuAgTe4

AU - Zamyatin, Dmitry A.

AU - Pankrushina, Elizaveta A.

AU - Streltsov, Sergey V.

AU - Ponosov, Yuri S.

N1 - This research was funded by the state assignment of the Ministry of Science and Higher Education of the Russian Federation (Theme “Electron” No. 122021000039-4). The Phonon spectra interpretation was funded within the framework of research project No. 122011300125-2. The SEM and EPMA analysis was funded within the framework of IGG UB RAS research project No. AAAA-A19-119071090011-6.

PY - 2023

Y1 - 2023

N2 - Here, we report results of the investigation of the lattice dynamics of the sylvanite mineral AuAgTe4 in a wide temperature and pressure range by Raman spectroscopy, together with the first-principle calculations. At ambient pressure, the experimental spectrum agrees well with the calculation data. The temperature behavior of the phonon self-energies (frequencies and linewidths) are described by an anharmonic mechanism and imply negligible contributions of electron-phonon interaction at low temperatures. A structural phase transition was recorded in the pressure range of 4-6 GPa, which is in accordance with theoretical predictions. At higher pressures, evidence of local structural disorder was found that made it possible to experimentally observe the spectrum of the density of vibrational states of AuAgTe4, which becomes superconducting under pressure.

AB - Here, we report results of the investigation of the lattice dynamics of the sylvanite mineral AuAgTe4 in a wide temperature and pressure range by Raman spectroscopy, together with the first-principle calculations. At ambient pressure, the experimental spectrum agrees well with the calculation data. The temperature behavior of the phonon self-energies (frequencies and linewidths) are described by an anharmonic mechanism and imply negligible contributions of electron-phonon interaction at low temperatures. A structural phase transition was recorded in the pressure range of 4-6 GPa, which is in accordance with theoretical predictions. At higher pressures, evidence of local structural disorder was found that made it possible to experimentally observe the spectrum of the density of vibrational states of AuAgTe4, which becomes superconducting under pressure.

UR - https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=tsmetrics&SrcApp=tsm_test&DestApp=WOS_CPL&DestLinkType=FullRecord&KeyUT=000956617700001

UR - http://www.scopus.com/inward/record.url?partnerID=8YFLogxK&scp=85151130131

U2 - 10.3390/inorganics11030099

DO - 10.3390/inorganics11030099

M3 - Article

VL - 11

JO - Inorganics

JF - Inorganics

SN - 2304-6740

IS - 3

M1 - 99

ER -