Specific heat and superfluid density for possible two different superconducting states in NaxCoO2·yH2O

Masahito Mochizuki, H. Q. Yuan, Masao Ogata

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Several thermodynamic measurements for the cobaltate superconductor, NaxCoO2·yH2O, have so far provided results inconsistent with each other. In order to solve the discrepancies, we microscopically calculate the temperature dependences of specific heat and superfluid density for this superconductor. We show that two distinct specific-heat data from Oeschler et al. and Jin et al. are reproduced, respectively, for the extended s-wave state and the p-wave state. Two different superfluid-density data are also reproduced for each case. These support our recent proposal of possible two different pairing states in this material. In addition, we discuss the experimentally proposed large residual Sommerfeld coefficient and extremely huge effective carrier mass.

Original languageEnglish
Article number023702
Journaljournal of the physical society of japan
Volume76
Issue number2
DOIs
Publication statusPublished - 2007 Feb 1
Externally publishedYes

Keywords

  • Co-oxide superconductor
  • Specific heat
  • Superfluid density

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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