Formation of As-As Bond and Its Effect on Absence of Superconductivity in Collapsed Tetragonal Phase of Ca0.86Pr0.14Fe2As2 : An Optical Spectroscopy Study

Abstract

The temperature dependence of in plane optical conductivity has been investigated for Ca0.86Pr0.14Fe2As2 which shows a structural transition from tetragonal (T) to collapsed tetragonal(cT) phase at TcT=73 K. Upon entering the cT phase, drastic change characterized by the formation of a midinfrared peak near 3200 cm-1(0.4 eV) in the optical conductivity is observed.Analysis of the spectral weight reveals reduced electron correlation after the cT phase transition.Based on the calculated band structure and simulated optical conductivity, we attribute the new feature around 0.4 eV to the formation of interlayer As-As bond. The As-As bond strongly affects the Fe-As hybridizations, and in turn, drastically changes the Ca0.86Pr0.14Fe2As2 into a nonmagnetic Fermi liquid system without bulk superconductivity in the cT phase.

References in corpus (15)

• High-temperature superconductivity in iron-based materials
• Pressure induced superconductivity in CaFe${}_2$As${}_2$
• The Unprecedented Giant Coupling of Fe-spin State and the As-As Hybridization in Iron-Pnictide
• Antiferromagnetic superexchange interactions in LaOFeAs
• The Absence of Superconductivity in Single Phase CaFe2As2 under Hydrostatic Pressure
• Synthesis and Properties of CaFe${}_2$As${}_2$ Single Crystals
• Spin-state transition in the Fe-pnictides
• Suppression of antiferromagnetic spin fluctuations in the collapsed tetragonal phase of CaFe2As2
• Correlation effects in the tetragonal and collapsed tetragonal phase of CaFe2As2
• Role of covalent Fe-As bonding in the magnetic moment formation and exchange mechanisms in iron-pnictide superconductors
• Pressure Suppression of Electron Correlation in the Collapsed Tetragonal Phase of $CaF{e}_{2}A{s}_2$ : A DFT-DMFT Investigation
• Correlation, doping and interband effects on the optical conductivity of iron superconductors
• Spectral weight transfer in strongly correlated Fe${}_{1.03}$Te
• Quenched Fe Moment in the Collapsed Tetragonal Phase of Ca${}_{1-x}$Pr${}_x$Fe${}_2$As${}_2$
• Optical spectroscopy study of the collapsed tetragonal phase of CaFe${}_2$(As${}_{0.935}$P${}_{0.065}$)${}_2$ single crystals

Cited by in corpus (2)

• Wavefunctions, electronic localization and bonding properties for correlated materials beyond the Kohn-Sham formalism
• Role of electron-electron interactions in the charge dynamics of rare-earth-doped CaFe2As2