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.

arXiv comment5 pages, 3 figures, 1 table

References in corpus (21)

• High-temperature superconductivity in iron-based materials
• Superconductivity at 22 K in Co-doped BaFe2As2 Crystals
• Spin density wave anomaly at 140 K in the ternary iron arsenide BaFe2As2
• Kramers-Kronig constrained variational analysis of optical spectra
• Evidence for an electron nematic phase transition in underdoped iron pnictide superconductors
• Electrodynamics of Correlated Electron Materials
• Electronic correlations in the iron pnictides
• Magnetism and Charge Dynamics in Iron Pnictides
• Origin of the spin density wave instability in AFe${}_2$As${}_2$ (A=Ba, Sr) as revealed by optical spectroscopy
• Unprecedented anisotropic metallic state in BaFe2As2 revealed by optical spectroscopy
• Gate tunable charged-phonon effect in bilayer graphene
• Structure and Anisotropic Properties of BaFe2-xNixAs2 (x = 0, 1, 2) Single Crystals
• Effects of the magnetic orderings on the dynamical conductivity: optical investigations of EuFe${}_2$As${}_2$ single crystals
• Raman scattering study of (K${}_x$Sr${}_{1-x}$)Fe${}_2$As${}_2$ ($x$ = 0.0, 0.4)
• Doping dependence of the lattice dynamics in Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ studied by Raman spectroscopy
• Phonon anomaly in BaFe2As2
• Optical and Raman spectroscopy studies on Fe-based superconductors
• Neutron scattering investigation of the magnetic order in single crystalline BaFe2As2
• The optical phonon spectrum of SmFeAsO
• Formation of partial energy gap below the structural phase transition and the rare-earth element substitution effect on infrared phonons in ReFeAsO (Re=La, Nd, and Sm)
• Phonon spectra in CaFe2As2 and Ca0.6Na0.4Fe2As2: Measurement of the pressure and temperature dependence and comparison with ab-initio and shell model calculations

Cited by in corpus (21)

• Magnetic interactions in iron superconductors: A review
• Effect of Co doping on the in-plane anisotropy in the optical spectrum of underdoped Ba(Fe1-xCox)2As2
• Origin of the resistive anisotropy in the electronic nematic phase of BaFe${}_2$As${}_2$ revealed by optical spectroscopy
• Phonon softening near structural transition in BaFe2As2 observed by inelastic x-ray scattering
• Optical conductivity of iron-based superconductors
• Persistent detwinning of iron pnictides by small magnetic fields
• Infrared study of the spin reorientation transition and its reversal in the superconducting state in underdoped Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
• Detection of bosonic mode as a signature of magnetic excitation in one unit cell FeSe on SrTiO3
• Strong Coupling of the Iron-Quadrupole and Anion-Dipole Polarizations in Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Spin-density-wave-induced anomalies in the optical conductivity of AFe2As2, (A=Ca, Sr, Ba) single-crystalline iron pnictides
• Optical properties of $A$Fe${}_2$As${}_2$ ($A=$Ca, Sr, and Ba) single crystals
• On the Structure of Superconducting Order Parameter in High-Temperature Fe-Based Superconductors
• Optical properties of the iron-pnictide analog BaMn2As2
• Anomalous phonon redshift in K-doped BaFe2As2 iron pnictides
• Muon spin rotation and infrared spectroscopy study of magnetism and superconductivity in Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
• Optical study of Dirac fermions and related phonon anomalies in antiferromagnetic compound CaFeAsF
• Coupling of the A_{1g} As-phonon to magnetism in iron pnictides
• Scaling of the Fano effect of the in-plane Fe-As phonon and the superconducting critical temperature in Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
• Electronic Scattering Effects in Europium-Based Iron Pnictides
• Anisotropic optical properties of detwinned BaFe${}_2$As${}_2$
• Vibrational anomalies in AFe${}_2$As${}_2$ (A$=$Ca, Sr, and Ba) single crystals