### 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 language | English |
---|---|

Number of pages | 1 |

Journal | Physical Review Letters |

Volume | 92 |

Issue number | 4 |

DOIs | |

Publication status | Published - Jan 1 2004 |

Externally published | Yes |

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### ASJC Scopus subject areas

- Physics and Astronomy(all)

### Cite this

*Physical Review Letters*,

*92*(4). https://doi.org/10.1103/PhysRevLett.92.047004

**Unconventional Superconductivity and Electron Correlations in the Cobalt Oxyhydrate [Formula presented] from Nuclear Quadrupole Resonance.** / Fujimoto, Tatsuya; Zheng, Guo-Qing; Kitaoka, Y.; Meng, R. L.; Cmaidalka, J.; Chu, C. W.

Research output: Contribution to journal › Article

*Physical Review Letters*, vol. 92, no. 4. https://doi.org/10.1103/PhysRevLett.92.047004

}

TY - JOUR

T1 - Unconventional Superconductivity and Electron Correlations in the Cobalt Oxyhydrate [Formula presented] from Nuclear Quadrupole Resonance

AU - Fujimoto, Tatsuya

AU - Zheng, Guo-Qing

AU - Kitaoka, Y.

AU - Meng, R. L.

AU - Cmaidalka, J.

AU - Chu, C. W.

PY - 2004/1/1

Y1 - 2004/1/1

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85038300978&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85038300978&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.92.047004

DO - 10.1103/PhysRevLett.92.047004

M3 - Article

AN - SCOPUS:85038300978

VL - 92

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 4

ER -