Magnetic field dependence of low-temperature specific heat of the spinel oxide superconductor LiTi2O4
C. P. Sun, J.-Y. Lin, S. Mollah, P. L. Ho, H. D. Yang, F. C. Hsu, Y. C. Liao, M. K. Wu
DOI 10.1103/PhysRevB.70.054519 · Physical Review B
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Abstract
Magnetic field dependence of low temperature specific heat of spinel oxide superconductor LiTi2O4 has been elaborately investigated. In the normal state, the obtained electronic coefficient of specific heat γn=19.15mJ∕molK2, the Debye temperature ΘD=657K and some other parameters are compared with those reported earlier. The superconducting transition at Tc∼11.4K is very sharp (ΔTc∼0.3K) and the estimated δC∕γnTc is ∼1.78. In the superconducting state, the best fit of data leads to the electronic specific heat Ces∕γnTc=9.87exp(−1.58Tc∕T) without field and γ(H)∝H0.95 with fields. In addition, Hc2(0)∼11.7T, Hc(0)∼0.32T, ξGL(0)∼55Å, λGL(0)∼1600Å, and Hc1(0)∼26mT are estimated from the Werthamer-Helfand-Hohenberg (WHH) theory or other relevant relations. All results from the present study indicate that LiTi2O4 can be well described by a typical type-II, BCS-like, moderate coupling, and fully gapped superconductor in the dirty limit. It is further suggested that LiTi2O4 is a moderately electron-electron correlated system.
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. | 11.4 | Pressure not reported | midpoint |
| LiTi2O4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11.4 | Pressure not reported | onset |
| LiTi2O4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11.7 | Pressure not reported | unknown |
| LiTi2O4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12.4 | Pressure not reported | unknown |
| LiTi2O4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11.8 | Pressure not reported | unknown |
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