Magnetic field dependence of low-temperature specific heat of the spinel oxide superconductor LiTi2O4

C. P. Sun, Jiunn-Yuan Lin, S. Mollah*, P. L. Ho, H. D. Yang, F. C. Hsu, Y. C. Liao, M. K. Wu

*Corresponding author for this work

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37 Scopus citations

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 = 19.15 mJ/mol K2, the Debye temperature ΘD=657 K and some other parameters are compared with those reported earlier. The superconducting transition at Tc∼11.4 K is very sharp (ΔTc∼0.3 K) and the estimated δC/γnTc is ∼1.78. In the superconducting state, the best fit of data leads to the electronic specific heat C esnTc=9.87 exp(-1.58 Tc/T) without field and γ(H) ∝ H0.95 with fields. In addition, Hc2(0)∼11.7 T, Hc(0)∼0.32 T, ξGL(0) ∼55 Å, λGL(0)∼1600 Å, and H c1(0)∼26 mT 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.

Original languageEnglish
Article number054519
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume70
Issue number5
DOIs
StatePublished - 1 Aug 2004

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