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26 April 2024 |
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Specific heat of unconventional superconductivity in NaxCoO2-yH2O | | H. D. Yang
; J.-Y. Lin
; C. P. Sun
; Y. C. Kang
; K. Takada
; T. Sasaki
; H. Sakurai
; E. Takayama-Muromachi
; | | Date: |
2 Aug 2003 | | Subject: | Superconductivity; Strongly Correlated Electrons | cond-mat.supr-con cond-mat.str-el | | Abstract: | 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. | | Source: | arXiv, cond-mat/0308031 | | Services: | Forum | Review | PDF | Favorites | |
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