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28 March 2024
 
  » arxiv » cond-mat/0407695

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Magnetic field dependence of low temperature specific heat of spinel oxide superconductor LiTi_2O_4
C. P. Sun ; J. -Y. Lin ; S. Mollah ; P. L. Ho ; H. D. Yang ; F. C. Hsu ; Y. C. Liao ; M. K. Wu ;
Date 27 Jul 2004
Subject Superconductivity; Strongly Correlated Electrons | cond-mat.supr-con cond-mat.str-el
AbstractMagnetic field dependence of low temperature specific heat of spinel oxide superconductor LiTi_2O_4 has been elaborately investigated. In the normal state, the obtained electronic coefficient of specific heat gamma_n = 19.15 mJ/mol K2, the Debye temperature is 657 K and some other parameters are compared with those reported earlier. The superconducting transition at Tc ~ 11.4 K is very sharp (DeltaTc ~ 0.3 K) and the estimated delataC/gamma_nTc is ~ 1.78. In the superconducting state, the best fit of data leads to the electronic specific heat C_es/Gamma_nTc = 9.87 exp (-1.58 Tc/T) without field and gamma(H) ~ H^0.95 with fields. In addition, Hc2(0) ~ 11.7 T, Hc(0) ~ 0.32 T, xi_GL(0) ~ 5.5 nm, lambda_GL(0) ~ 160 nm, and Hc1(0) ~ 26 mT are estimated from 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 arXiv, cond-mat/0407695
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