標題: Magnetic field dependence of low-temperature specific heat of the spinel oxide superconductor LiTi2O4
作者: Sun, CP
Lin, JY
Mollah, S
Ho, PL
Yang, HD
Hsu, FC
Liao, YC
Wu, MK
物理研究所
Institute of Physics
公開日期: 1-Aug-2004
摘要: 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 gamma(n)=19.15 mJ/mol K-2, the Debye temperature Theta(D)=657 K and some other parameters are compared with those reported earlier. The superconducting transition at T(c)similar to11.4 K is very sharp (DeltaT(c)similar to0.3 K) and the estimated deltaC/gamma(n)T(c) is similar to1.78. In the superconducting state, the best fit of data leads to the electronic specific heat C-es/gamma(n)T(c)=9.87 exp(-1.58 T-c/T) without field and gamma(H)proportional toH(0.95) with fields. In addition, H-c2(0)similar to11.7 T, H-c(0)similar to0.32 T, xi(GL)(0)similar to55 A, lambda(GL)(0)similar to1600 Angstrom, and H-c1(0)similar to26 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.
URI: http://dx.doi.org/10.1103/PhysRevB.70.054519
http://hdl.handle.net/11536/26497
ISSN: 1098-0121
DOI: 10.1103/PhysRevB.70.054519
期刊: PHYSICAL REVIEW B
Volume: 70
Issue: 5
起始頁: 0
結束頁: 0
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