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Local structural distortions in SnTe investigated by EXAFS.

P Fornasini1, R Grisenti1, M Dapiaggi2

  • 1Dipartimento di Fisica - Università di Trento, Via Sommarive 14, I-38123 Povo (Trento), Italy.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|May 12, 2021
PubMed
Summary

Extended X-ray Absorption Fine Structure (EXAFS) reveals local rhombohedral distortion in SnTe up to 300 K. Above 300 K, changes in anharmonicity suggest phase transitions or mode softening.

Keywords:
EXAFSferroelectric transitionlocal distortionstin telluride

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid State Chemistry

Background:

  • Tin telluride (SnTe) exhibits a ferroelectric transition.
  • Understanding local structural dynamics is crucial for materials properties.

Purpose of the Study:

  • To investigate the local structure and phase transitions in SnTe using EXAFS.
  • To determine the temperature dependence of structural distortions.

Main Methods:

  • Extended X-ray Absorption Fine Structure (EXAFS) measurements at the Sn K-edge.
  • Data analysis across a wide temperature range (5–480 K).

Main Results:

  • Observed local rhombohedral distortion in SnTe from 5 K to 300 K.
  • EXAFS data suggest a partial order-disorder character of the ferroelectric transition.
  • Anomalous behavior of EXAFS cumulants above 300 K indicates modified anharmonicity.

Conclusions:

  • The ferroelectric transition in SnTe has characteristics of both displacive and order-disorder types.
  • Above 300 K, SnTe may undergo phase transitions or exhibit softening of high-frequency modes.