Raman scattering investigation of the electron-phonon coupling in superconducting Nd(O,F)BiS2
S. F. Wu, P. Richard, X. B. Wang, C. S. Lian, S. M. Nie, J. T. Wang, N. L. Wang, H. Ding
DOI 10.1103/PhysRevB.90.054519 · Physical Review B
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Abstract
We have performed polarized Raman scattering measurements on the newly discovered superconductor Nd(O,F)BiS2 (Tc=4 K). We observe 2 Raman-active modes, with frequencies in accordance with first-principles calculations. One A1g phonon mode at 112.4 cm−1 exhibits a Fano line shape due to electron-phonon coupling. We find a resonance for this mode at 2.45 eV excitation energy. We estimate a 0.68 contribution of this mode to the electron-phonon coupling constant λ. Our Raman results suggest that the BiS2-based superconductors are possibly phonon-mediated BCS superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nd(O,F)BiS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4 | Pressure not reported | unknown |
| LaO0.5F0.5BiS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10.6 | Pressure not reported | unknown |
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