Specific Heat and Superfluid Density for Possible Two Different Superconducting States in Na<I><SUB>x</SUB></I>CoO<SUB>2</SUB>·<I>y</I>H<SUB>2</SUB>O

• Mochizuki Masahito

  RIKEN

• Yuan H. Q.

  Department of Physics, University of Illinois at Urbana-Champaign

• Ogata Masao

  Department of Physics, University of Tokyo

Bibliographic Information

Other Title

• Specific Heat and Superfluid Density for Possible Two Different Superconducting States in NaXCoO2・yH2O
• Specific Heat and Superfluid Density for Possible Two Different Superconducting States in Na_<i>x</i>CoO₂·<i>y</i>H₂O

Abstract

Several thermodynamic measurements for the cobaltate superconductor, Na_xCoO₂·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.

Journal

• Journal of the Physical Society of Japan

  Journal of the Physical Society of Japan 76 (2), 023702-023702, 2007

  THE PHYSICAL SOCIETY OF JAPAN

Keywords

• Co-oxide superconductor
• specific heat
• superfluid density

Details

• CRID: 1390282679172163840
• NII Article ID: 130005296719
• NII Article ID: 110006203495
• NII Article ID: 210000106522
• NII Book ID: AA00704814
• DOI: 10.1143/jpsj.76.023702
• ISSN: 13474073
• ISSN: 00319015
• NDL BIB ID: 8639917
• Web Site: http://id.ndl.go.jp/bib/8639917
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I8639917
• Web Site: https://journals.jps.jp/doi/pdf/10.1143/JPSJ.76.023702
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed