Raman scattering in superconducting NdO1-x F x BiS2 crystals
Abstract
The recently discovered layered BiS2-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 NdO0.5F0.5BiS2 (T c = 4.5 K) and NdO0.7F0.3BiS2 (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.
- Publication:
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Superconductor Science Technology
- Pub Date:
- January 2016
- DOI:
- 10.1088/0953-2048/29/1/015007
- arXiv:
- arXiv:1501.04453
- Bibcode:
- 2016SuScT..29a5007T
- Keywords:
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- Condensed Matter - Superconductivity;
- Condensed Matter - Materials Science;
- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- 18 pages including suppl. materials, 8 figures, 35 references