Phonon splitting and anomalous enhancement of infrared-active modes in BaFe${}_2$As${}_2$

Abstract

We present a comprehensive infrared spectroscopic study of lattice dynamics in the pnictide parent compound BaFe${}_2$As${}_2$. 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 orthorhombic phase, we observe splitting into four non-degenerate 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 the result of anisotropic conductivity due to Hund's coupling.

5 pages, 3 figures, 1 table

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Cited by in corpus (7)

• Effect of Co doping on the in-plane anisotropy in the optical spectrum of underdoped Ba(Fe1-xCox)2As2
• Optical conductivity of iron-based superconductors
• Persistent detwinning of iron pnictides by small magnetic fields
• On the Structure of Superconducting Order Parameter in High-Temperature Fe-Based Superconductors
• Anomalous phonon redshift in K-doped BaFe2As2 iron pnictides
• Optical properties of the iron-pnictide analog BaMn2As2
• Muon spin rotation and infrared spectroscopy study of magnetism and superconductivity in Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$