Phonon anomaly in BaFe2As2
A. Akrap, J. J. Tu, L. J. Li, G. H. Cao, X. A. Xu, and C. C. Homes
TL;DR
This study investigates the optical properties of BaFe2As2, revealing a phonon anomaly linked to orbital ordering that occurs at the magnetic transition temperature, providing insights into its lattice dynamics.
Contribution
It presents detailed optical measurements across the magnetic transition, identifying a phonon anomaly associated with orbital ordering in BaFe2As2.
Findings
Discontinuous phonon frequency shift at T_N
Nearly doubled phonon intensity below T_N
Anomalous phonon behavior linked to orbital ordering
Abstract
The detailed optical properties of BaFe2As2 have been determined over a wide frequency range above and below the structural and magnetic transition at T_N = 138 K. A prominent in-plane infrared-active mode is observed at 253 cm^{-1} (31.4 meV) at 295 K. The frequency of this vibration shifts discontinuously at T_N; for T < T_N the frequency of this mode displays almost no temperature dependence, yet it nearly doubles in intensity. This anomalous behavior appears to be a consequence of orbital ordering in the Fe-As layers.
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