Raman study of electron-phonon coupling in thin films of the spinel oxide superconductor LiTi2O4
D. Chen, Y.-L. Jia, T.-T. Zhang, Z. Fang, K. Jin, P. Richard, H. Ding
DOI 10.1103/PhysRevB.96.094501 · Physical Review B
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Abstract
We performed a Raman scattering study of thin films of LiTi2O4 spinel oxide superconductor. We detected four out of five Raman active modes, with frequencies in good accordance with our first-principles calculations. Three T2g modes show a Fano lineshape from 5 K to 295 K, which suggests an electron-phonon coupling in LiTi2O4. Interestingly, the electron-phonon coupling shows an anomaly across the negative to positive magnetoresistance transition at 50 K, which may be due to the onset of other competing orders. The strength of the electron-phonon interaction estimated from the Allen's formula and the observed lineshape parameters suggest that the three T2g modes at 0 momentum are not sufficient to drive superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LiTi2O4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11.3 | Pressure not reported | onset |
| LiTi2O4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12 | Pressure not reported | unknown |
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