Unconventional Superconductivity and Electron Correlations in the Cobalt Oxyhydrate [Formula presented] from Nuclear Quadrupole Resonance

Tatsuya Fujimoto, Guo qing Zheng, Y. Kitaoka, R. L. Meng, J. Cmaidalka, C. W. Chu

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We report a careful [Formula presented] nuclear quadrupolar resonance measurement on the recently discovered cobalt oxyhydrate [Formula presented] superconductor from [Formula presented] down to 0.2 K. We find that in the normal state the spin-lattice relaxation rate [Formula presented] follows a Curie-Weiss type temperature ([Formula presented]) variation, [Formula presented], with [Formula presented], suggesting two-dimensional antiferromagnetic spin correlations. Below [Formula presented], [Formula presented] decreases with no coherence peak and follows a [Formula presented] dependence with [Formula presented] down to [Formula presented] but crosses over to a [Formula presented] variation below [Formula presented], which suggests non-[Formula presented]-wave superconductivity. The data in the superconducting state are most consistent with the existence of line nodes in the gap function.

Original languageEnglish
Pages (from-to)4
Number of pages1
JournalPhysical Review Letters
Volume92
Issue number4
DOIs
Publication statusPublished - 2004
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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