Raman scattering in superconducting NdO 1-x F x BiS 2 crystals

Yong Tian, Anmin Zhang, Kai Liu, Jianting Ji, Jianzhong Liu, Xiyu Zhu, Hai Hu Wen, Feng Jin, Xiaoli Ma, Rui He, Qing Ming Zhang

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

The recently discovered layered BiS 2 -based superconductors are of great interest due to their structural similarity to cuprate and iron-pnictide superconductors. We performed Raman scattering measurements on two superconducting crystals NdO 0.5 F 0.5 BiS 2 (T c = 4.5 K) and NdO 0.7 F 0.3 BiS 2 (T c = 4.8 K). We assigned observed Raman phonon modes with the aid of first-principles calculations. The asymmetric phonon mode around 118 cm -1 reveals a small electron-phonon coupling constant λ ∼ 0.16, which is insufficient to generate superconductivity at ∼4.5 K.

Original languageEnglish
Article number015007
JournalSuperconductor Science and Technology
Volume29
Issue number1
DOIs
StatePublished - Jan 1 2016

Keywords

  • Raman scattering
  • electron-phonon coupling
  • superconductive mechanism

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