Anomalous Raman scattering from phonons and electrons of superconducting FeSe$_{0.82}$

Details Anomalous Raman scattering from phonons and electrons of superconducting FeSe$_{0.82}$ Anomalous Raman scattering from phonons and electrons of superconducting FeSe$_{0.82}$

2010-04-09

arxiv.org/abs/1004.1612v1

Solid State Communications (Fast Track) vol. 150, pp. 557 (2010)

Physics

Condensed Matter

Superconductivity

19 pages, 4 figures, 1 table

Scientific paper

10.1016/j.ssc.2010.01.033

We report interesting anomalies in the temperature dependent Raman spectra of FeSe$_{0.82}$ measured from 3K to 300K 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 $\sim$ 5% in frequency below a temperature T$_s$ ($\sim$ 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.

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