Journal
PHYSICAL REVIEW B
Volume 80, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.180502
Keywords
barium compounds; iron compounds; magnetic transitions; optical conductivity; phonons; solid-state phase transformations; vibrational modes
Funding
- National Science Foundation of China
- National Basic Research Program of China [2006CB601003, 2007CB925001]
- Ministry of Education of China [IRT0754]
- Office of Science, U.S. Department of Energy (DOE) [DE-AC02-98CH10886]
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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 similar or equal to 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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