Anomalous Raman scattering from phonons and electrons of superconducting

We report interesting anomalies in the temperature dependent Raman spectra of FeSe sub(0.82) measured from 3 K to 300 K in the spectral range from 60 to 1800 cm super(-1) and determine their origin using complementary first-principles density functional calculations. A phonon mode near 100 cm super(...

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Bibliographic Details
Published inSolid state communications Vol. 150; no. 13-14; pp. 557 - 560
Main Authors Kumar, Pradeep, Kumar, Anil, Saha, Surajit, Muthu, D.V.S., Prakash, J., Patnaik, S., Waghmare, U.V., Ganguli, A.K., Sood, A.K.
Format Journal Article
LanguageEnglish
Published 01.04.2010
Subjects
Density
Electronics
High frequencies
Mathematical analysis
Phonons
Raman scattering
Spectra
Superconductivity
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Summary:We report interesting anomalies in the temperature dependent Raman spectra of FeSe sub(0.82) measured from 3 K to 300 K in the spectral range from 60 to 1800 cm super(-1) and determine their origin using complementary first-principles density functional calculations. A phonon mode near 100 cm super(-1) exhibits a sharp increase by [not, vert, similar]5% in the frequency below a temperature T sub()s([not, vert, similar]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 super(-1) and 1600 cm super(-1), attributed to electronic Raman scattering from (x super(2)-y super(2)) to xz/yz d-orbitals of Fe.
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ISSN:0038-1098
DOI:10.1016/j.ssc.2010.01.033