Phonon mechanism for the orthorhombic distortion in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">FeSi</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math></span> as compared to cubic <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">CoSi</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math></span>

S. Sanguinetti; C. Calegari; V. R. Velasco; G. Benedek; F. Tavazza; Leo Miglio

doi:10.1103/PhysRevB.54.9196

Phonon mechanism for the orthorhombic distortion in ${FeSi}_{2}$ as compared to cubic ${CoSi}_{2}$

S. Sanguinetti, C. Calegari, V. R. Velasco, G. Benedek, F. Tavazza, and Leo Miglio

Phys. Rev. B 54, 9196 – Published 1 October 1996

Abstract

We analyze the leading role of the electron-phonon interaction in promoting the structural distortion from fluorite to orthorhombic ${FeSi}_{2}$ by comparing a tight-binding calculation of the force constants and phonon dispersion relations in ${FeSi}_{2}$ to the ones in ${CoSi}_{2}$ , a related compound which is stable in fluorite phase. © 1996 The American Physical Society.

Received 6 May 1996

DOI:https://doi.org/10.1103/PhysRevB.54.9196

Authors & Affiliations

S. Sanguinetti, C. Calegari, V. R. Velasco, G. Benedek, F. Tavazza, and Leo Miglio

Istituto Nazionale per la Fisica della Materia and Dipartimento di Fisica dell'Università di Milano, Via Celoria 16, 20133 Milano, Italy

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Vol. 54, Iss. 13 — 1 October 1996

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Physical Review B

covering condensed matter and materials physics