Journal
PHYSICAL REVIEW B
Volume 84, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.052501
Keywords
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Funding
- NSF [1005493]
- AFOSR
- US Department of Energy, Basic Energy Sciences, Materials Sciences and Engineering
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1005493] Funding Source: National Science Foundation
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We present a comprehensive infrared spectroscopic study of lattice dynamics in the pnictide parent compound BaFe2As2. In the tetragonal structural phase, we observe the two degenerate symmetry-allowed in-plane infrared-active phonon modes. Following the structural transition from the tetragonal to the orthorhombic phase, we observe a splitting into four nondegenerate phonon modes and a significant phonon strength enhancement. These detailed data allow us to provide a physical explanation for the anomalous phonon strength enhancement as being the result of anisotropic conductivity due to Hund's coupling.
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