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Specific heat of unconventional superconductivity in NaxCoO2-yH2O

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arxiv cond-mat/0308031 v3 pith:2CS4JJDP submitted 2003-08-02 cond-mat.supr-con cond-mat.str-el

H. D. Yang , J.-Y. Lin , C. P. Sun , Y. C. Kang , K. Takada , T. Sasaki , H. Sakurai , E. Takayama-Muromachi This is my paper
classification cond-mat.supr-concond-mat.str-el
keywords superconductingheatnaxcoo2-yh2oobservedphasespecificstatesuperconductivity
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Comprehensive studies of the low-temperature specific heat C(T,H) in NaxCoO2-yH2O are presented. At H=0, a very sharp anomaly was observed at T=4.7 K indicating the existence of bulk superconductivity. There exists the T^2 term in C(T,H=0) in the superconducting state manifesting the line nodal superconducting order parameter. The superconducting volume fraction is estimated to be 26.6 % based on the consideration of entropy conservation at Tc for the second-order superconducting phase transition. An abrupt change of the slope in Tc(H) was observed. Possible scenarios such as the multiple phase transitions in the mixed state are discussed.

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