Electrical resistivity and Andreev reflection spectroscopy of the superconducting oxide spinel LiTi2O4
L. Tang, P. Y. Zou, L. Shan, A. F. Dong, G. C. Che, H. H. Wen
DOI 10.1103/PhysRevB.73.184521 · Physical Review B
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Abstract
We measured resistivity and Andreev reflection spectroscopy on LiTi2O4 polycrystalline samples (Tc≈12.3K) synthesized by a new method. Resistivity shows the metallic temperature dependence and is well fitted by the Bloch-Grüneisen theory above 90K. This is consistent with the picture of electron-phonon scattering. Below 90K and above Tc it shows T2 temperature dependence suggesting Fermi liquid behavior above Tc. From the Hc2−T phase diagram the upper critical field Hc2(0) is estimated to be about 11.6T based on the Ginzburg-Landau theory. Point-contact Andreev reflection spectroscopy gives 2Δ0∕kBTC≈4 and reveals that LiTi2O4 is a typical intermediate-coupling s-wave BCS superconductor. We also observed the resistive hump in a normal state and the field-induced upturn near the transition region of the ρ(T) curve on the aged samples. In comparison with the fresh one, it suggests that the above exotic ρ(T) behavior is not an intrinsic character of the pure stoichiometric LiTi2O4 compound.
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. | 12.3 | Pressure not reported | midpoint |
| LiTi2O4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12.5 | 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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