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

作者：Kumar Pradeep; Kumar Anil; Saha Surajit; Muthu D V S; Prakash J; Patnaik S; Waghmare U V; Ganguli A K; Sood A K^*

来源：Solid State Communications, 2010, 150(13-14): 557-560.

DOI：10.1016/j.ssc.2010.01.033

• Superconductors
• Spin-phonon coupling

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.

• 出版日期2010-4