Work

Specific Heat and Superfluid Density for Possible Two Different Superconducting States in NaxCoO2·yH2O

Year: 2007

Type: article

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.

Source: Journal of the Physical Society of Japan

DOI: 10.1143/jpsj.76.023702

Authors: Masahito Mochizuki, H. Q. Yuan, Masao Ogata

Institutions: RIKEN, University of Illinois Urbana-Champaign, The University of Tokyo

Language: English

Topic: Physics of Superconductivity and Magnetism

Subfield: Condensed Matter Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: U.S. Department of Energy, Ministry of Education, Culture, Sports, Science and Technology, RIKEN

Award: G9000009795