Anomalous phonon redshift in K-doped BaFe$_2$As$_2$ iron pnictides - Archive ouverte HAL Access content directly
Journal Articles Physical Review B: Condensed Matter and Materials Physics (1998-2015) Year : 2015

Anomalous phonon redshift in K-doped BaFe$_2$As$_2$ iron pnictides

(1, 2) , (3) , (2) , (2) , (4) , (5) , (5) , (6) , (2) , (3) , (2) , (1)
1
2
3
4
5
6

Abstract

The effect of K, Co, and P dopings on the lattice dynamics in the BaFe$_2$As$_2$ system is studied by infrared spectroscopy. We focus on the phonon at ∼ 253 cm$^{-1}$ , the highest energy in-plane infrared-active Fe-As mode in BaFe$_2$As$_2$. Our studies show that Co and P dopings lead to a blueshift of this phonon in frequency, which can be simply interpreted by the change in lattice parameters induced by doping. In sharp contrast, an unusual redshift of the same mode was observed in the K-doped compound, at odds with the above explanation. This anomalous behavior in K-doped BaFe$_2$As$_2$ is more likely associated with the coupling between lattice vibrations and other channels, such as charge or spin. This coupling scenario is also supported by the asymmetric line shape and intensity growth of the phonon in the K-doped compound.
Fichier principal
Vignette du fichier
PhysRevB.91.104510.pdf (422.08 Ko) Télécharger le fichier
Origin : Publisher files allowed on an open archive
Loading...

Dates and versions

cea-01497885 , version 1 (29-03-2017)

Identifiers

Cite

B. Xu, Y. M. Dai, B. Shen, H. Xiao, Z. R. Ye, et al.. Anomalous phonon redshift in K-doped BaFe$_2$As$_2$ iron pnictides. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2015, 91, pp.104510. ⟨10.1103/PhysRevB.91.104510⟩. ⟨cea-01497885⟩
221 View
108 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More