Evidence for d-wave pairing in the cobalt oxide superconductor Nax CoO2 · 1.3 H2 O

K. Matano; Guo Qing Zheng; D. P. Chen; C. T. Lin

doi:10.1016/j.physb.2007.10.251

Evidence for d-wave pairing in the cobalt oxide superconductor Na_x CoO₂ · 1.3 H₂ O

K. Matano, Guo Qing Zheng, D. P. Chen, C. T. Lin

School of Science

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

We report the spin susceptibility in the superconducting state of the cobalt oxide superconductor Na_x CoO₂ · 1.3 H₂ O, via the ⁵⁹Co Knight shift measurements. Along both a- and c-axis directions, the shift decreases below T_c. At T = 1.7 K, the shift along the a-axis, K_a, increases with increasing the strength of magnetic field (H), following a sqrt(H) variation. Together with the T³ dependence of the spin-lattice relaxation rate, 1 / T₁, these results indicate unambiguously that the Cooper pairs are in the spin-singlet form and that there exist nodes in the gap function. The data are most consistent with a d-wave symmetry.

Original language	English
Pages (from-to)	1107-1108
Number of pages	2
Journal	Physica B: Condensed Matter
Volume	403
Issue number	5-9
DOIs	https://doi.org/10.1016/j.physb.2007.10.251
Publication status	Published - Apr 1 2008

Keywords

NMR
Na CoO · y H O
Superconductivity
d-Wave symmetry

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

Access to Document

10.1016/j.physb.2007.10.251

Cite this

@article{ca3308c440ad4988878b50a79f40224d,

title = "Evidence for d-wave pairing in the cobalt oxide superconductor Nax CoO2 · 1.3 H2 O",

abstract = "We report the spin susceptibility in the superconducting state of the cobalt oxide superconductor Nax CoO2 · 1.3 H2 O, via the 59Co Knight shift measurements. Along both a- and c-axis directions, the shift decreases below Tc. At T = 1.7 K, the shift along the a-axis, Ka, increases with increasing the strength of magnetic field (H), following a sqrt(H) variation. Together with the T3 dependence of the spin-lattice relaxation rate, 1 / T1, these results indicate unambiguously that the Cooper pairs are in the spin-singlet form and that there exist nodes in the gap function. The data are most consistent with a d-wave symmetry.",

keywords = "NMR, Na CoO · y H O, Superconductivity, d-Wave symmetry",

author = "K. Matano and Zheng, {Guo Qing} and Chen, {D. P.} and Lin, {C. T.}",

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T1 - Evidence for d-wave pairing in the cobalt oxide superconductor Nax CoO2 · 1.3 H2 O

AU - Matano, K.

AU - Zheng, Guo Qing

AU - Chen, D. P.

AU - Lin, C. T.

PY - 2008/4/1

Y1 - 2008/4/1

N2 - We report the spin susceptibility in the superconducting state of the cobalt oxide superconductor Nax CoO2 · 1.3 H2 O, via the 59Co Knight shift measurements. Along both a- and c-axis directions, the shift decreases below Tc. At T = 1.7 K, the shift along the a-axis, Ka, increases with increasing the strength of magnetic field (H), following a sqrt(H) variation. Together with the T3 dependence of the spin-lattice relaxation rate, 1 / T1, these results indicate unambiguously that the Cooper pairs are in the spin-singlet form and that there exist nodes in the gap function. The data are most consistent with a d-wave symmetry.

AB - We report the spin susceptibility in the superconducting state of the cobalt oxide superconductor Nax CoO2 · 1.3 H2 O, via the 59Co Knight shift measurements. Along both a- and c-axis directions, the shift decreases below Tc. At T = 1.7 K, the shift along the a-axis, Ka, increases with increasing the strength of magnetic field (H), following a sqrt(H) variation. Together with the T3 dependence of the spin-lattice relaxation rate, 1 / T1, these results indicate unambiguously that the Cooper pairs are in the spin-singlet form and that there exist nodes in the gap function. The data are most consistent with a d-wave symmetry.

KW - NMR

KW - Na CoO · y H O

KW - Superconductivity

KW - d-Wave symmetry

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