Indexed by: Journal paper

First Author: ZG Chen

Co-author: NL Wang,XL Chen,JG Guo,JL Luo,P Zheng,YG Shi,G Xu,T Dong,RH Yuan

Journal: Physical Review B

Included Journals: SCI

Discipline: 物理学

Document Type: J

Volume: 83

Issue: 22

Page Number: 220507

ISSN No.: 2469-9950

Date of Publication: 2011-06-16

Impact Factor: 3.691

Abstract: We report an infrared spectroscopy study on K 0. 83 Fe 1. 53 Se 2, a semiconducting parent compound of the 245 iron selenide superconductors. The major spectral features are found to be distinctly different from all other Fe-based superconducting systems. Our measurement revealed two peculiar spectral structures: a double-peak structure between 4000 and 6000 cm− 1 and abundant phonon modes—much more than expected for a 122 structure. We elaborate that those features could be naturally explained from the blocked antiferromagnetism due to the presence of Fe vacancy ordering as determined by recent neutron-diffraction experiments. The double peaks reflect the coexistence of ferromagnetic and antiferromagnetic couplings between the neighboring Fe sites.

Links to published journals: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.83.220507