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Anomalous Raman scattering from phonons and electrons of superconducting FeSe0.82

Kumar, Pradeep and Kumar, Anil and Saha, Surajit and Muthu, DVS and Prakash, J and Patnaik, S and Waghmare, UV and Ganguli, AK and Sood, AK (2010) Anomalous Raman scattering from phonons and electrons of superconducting FeSe0.82. In: Solid State Communications, 150 (13-14). pp. 557-560.

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Official URL: http://dx.doi.org/10.1016/j.ssc.2010.01.033

Abstract

We report interesting anomalies in the temperature dependent Raman spectra of FeSe0.82 measured from 3 K to 300 K in the spectral range from 60 to 1800 cm(-1) and determine their origin using complementary first-principles density functional calculations. A phonon mode near 100 cm-1 exhibits a sharp increase by similar to 5% in the frequency below a temperature T-s (similar to 100 K) attributed to strong spin-phonon coupling and onset of short-range antiferromagnetic order. In addition, two high frequency modes are observed at 1350 cm-1 and 1600 cm-1, attributed to electronic Raman scattering from (x(2)-y(2)) to xz/yz d-orbitals of Fe. (C) 2010 Elsevier Ltd. All rights reserved.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: Superconductors;Spin-phonon coupling
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 25 Jun 2010 05:29
Last Modified: 19 Sep 2010 06:00
URI: http://eprints.iisc.ernet.in/id/eprint/27240

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