Frustration-driven correlated parent states in the spinel superconductor LiTi2O4
Yuita Fujisawa, Anjana Krishnadas, Chia-Hsiu Hsu, Takahito Takeda, Sheng Liu, Markel Pardo-Almanza, Yukiko Obata, Dyon van Dinter, Tomonori Nakamura, Kohei Yamagami, Guoqing Chang, Masaki Kobayashi, Chang-Yang Kuo, Yoshinori Okada
DOI 10.1103/q3xq-6p5f · Physical Review Research
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Abstract
Geometrically frustrated transition-metal oxides provide fertile ground for the emergence of novel quantum states. In the spinel superconductor LiTi2O4 (superconducting critical temperature Tc≈13K, formal 3d0.5 system), we uncover a prominent dispersion kink near the Fermi energy accompanied by negative thermal expansion below a characteristic temperature T*≈150K. We propose that charge frustration in the pyrochlore lattice leads to a degenerate electronic arrangement on Ti3+/Ti4+ sites, giving rise to strong intersite Coulomb interactions below T*. Within this framework, negative thermal expansion arises from the Coulomb repulsion of 3d1 electrons, while the prominent kink reflects reduced screening due to enhanced correlations. These findings open up promising avenues for exploring exotic correlated states in frustrated pyrochlore lattices, which are situated near the 3d1 Mott state.
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. | 13 | Pressure not reported | unknown |
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