Anisotropic band renormalization and nodeless gap of LiTi2O4 spinel superconductor
Min-Yi-Nan Lei, Xu Wang, Peng-Yu Zheng, Xiao-Xiao Wang, Xiao-Yang Chen, Zhi-Hui Chen, Yi-Ning Hu, Nan Guo, Zhi-Ping Yin, Tong Zhang, Rui Peng, Haichao Xu, Donglai Feng
DOI 10.1103/PhysRevB.112.045105 · Physical Review B
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Abstract
Spinel superconductors offer an exciting platform to explore electron correlation, superconductivity, and geometric frustration, while their electronic structure has been barely resolved. Here, by combining high-quality thin-film growth, in situ angle-resolved photoelectron spectroscopy, and ultra-low-temperature scanning tunneling spectroscopy studies, we directly uncovered the electronic structure, electron correlation, and superconducting gap behavior in LiTi2O4 spinel superconductor. Anisotropic band renormalization and electron-phonon coupling (EPC) were observed, which are likely modulated by the saddle-point dispersion. The observed strong EPC and U-shaped superconducting gap demonstrate a Bardeen-Cooper-Schrieffer (BCS) framework in LiTi2O4, while there are likely pair-breaking effects related to the spin fluctuations and geometric frustration, which enriches the understanding of the interplay between electron correlations, geometric frustration, and EPC in spinel superconductors.
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. | 11 | Pressure not reported | unknown |
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