Anomalous phonon redshift in K-doped BaFe$_2$As$_2$ iron pnictides
In: ISSN: 1098-0121 ; EISSN: 1550-235X, 2015
Online
academicJournal
Zugriff:
International audience ; 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.
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Anomalous phonon redshift in K-doped BaFe$_2$As$_2$ iron pnictides
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| Autor/in / Beteiligte Person: | Xu, B. ; Dai, Y. M. ; Shen, B. ; Xiao, H. ; Ye, Z. R. ; Forget, A. ; Colson, D. ; Feng, D. L. ; Wen, H. H. ; Homes, C. C. ; Qiu, X. G. ; Lobo, R. P. S. M. ; Laboratoire de Physique et d'Etude des Matériaux (UMR 8213) (LPEM) ; Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris) ; Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) ; Beijing National Laboratory for Condensed Matter Physics ; Chinese Academy of Sciences Changchun Branch (CAS) ; Brookhaven National Laboratory Upton, NY (BNL) ; UT-Battelle, LLC-Stony Brook University SUNY (SBU) ; State University of New York (SUNY)-State University of New York (SUNY)-U.S. Department of Energy Washington (DOE) ; Fudan University Shanghai ; Laboratoire Nano-Magnétisme et Oxydes (LNO) ; Service de physique de l'état condensé (SPEC - UMR3680) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (IRAMIS) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay ; Nanjing University (NJU) |
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| Zeitschrift: | ISSN: 1098-0121 ; EISSN: 1550-235X, 2015 |
| Veröffentlichung: | HAL CCSD ; American Physical Society, 2015 |
| Medientyp: | academicJournal |
| DOI: | 10.1103/PhysRevB.91.104510 |
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