NMR and NQR studies of the pairing symmetry in the superconducting state of Nax CoO2 · 1.3 H2 O

K. Matano; G. q. Zheng; D. P. Chen; C. T. Lin; J. Cmaidalka; R. L. Meng; C. W. Chu

doi:10.1016/j.jmmm.2006.10.531

NMR and NQR studies of the pairing symmetry in the superconducting state of Na_x CoO₂ · 1.3 H₂ O

K. Matano, G. q. Zheng, D. P. Chen, C. T. Lin, J. Cmaidalka, R. L. Meng, C. W. Chu

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Abstract

We report intensive studies on the cobalt oxide superconductors Na_x CoO₂ · 1.3 H₂ O via ⁵⁹Co NMR and NQR measurements. In the sample with x = 0.26 and T_c = 4.6, we find that the spin-lattice relaxation rate 1 / T₁ shows a T³ variation below T_c and down to very low temperatures, which indicates the presence of line nodes in the superconducting (SC) gap function. We have also studied the spin susceptibility below T_c via the Knight shift measurement. The spin part of the Knight shift decreases below T_c in both the a- and c-directions indicating singlet spin state of the Cooper pairs. Our results strongly suggest that the superconducting state is a d-wave state.

Original language	English
Pages (from-to)	687-689
Number of pages	3
Journal	Journal of Magnetism and Magnetic Materials
Volume	310
Issue number	2 SUPPL. PART 1
DOIs	https://doi.org/10.1016/j.jmmm.2006.10.531
Publication status	Published - 2007 Mar

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1016/j.jmmm.2006.10.531

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@article{1374d08346434926aef5ac199a30b26a,

title = "NMR and NQR studies of the pairing symmetry in the superconducting state of Nax CoO2 · 1.3 H2 O",

abstract = "We report intensive studies on the cobalt oxide superconductors Nax CoO2 · 1.3 H2 O via 59Co NMR and NQR measurements. In the sample with x = 0.26 and Tc = 4.6, we find that the spin-lattice relaxation rate 1 / T1 shows a T3 variation below Tc and down to very low temperatures, which indicates the presence of line nodes in the superconducting (SC) gap function. We have also studied the spin susceptibility below Tc via the Knight shift measurement. The spin part of the Knight shift decreases below Tc in both the a- and c-directions indicating singlet spin state of the Cooper pairs. Our results strongly suggest that the superconducting state is a d-wave state.",

author = "K. Matano and Zheng, {G. q.} and Chen, {D. P.} and Lin, {C. T.} and J. Cmaidalka and Meng, {R. L.} and Chu, {C. W.}",

year = "2007",

month = mar,

doi = "10.1016/j.jmmm.2006.10.531",

language = "English",

volume = "310",

pages = "687--689",

journal = "Journal of Magnetism and Magnetic Materials",

issn = "0304-8853",

publisher = "Elsevier",

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TY - JOUR

T1 - NMR and NQR studies of the pairing symmetry in the superconducting state of Nax CoO2 · 1.3 H2 O

AU - Matano, K.

AU - Zheng, G. q.

AU - Chen, D. P.

AU - Lin, C. T.

AU - Cmaidalka, J.

AU - Meng, R. L.

AU - Chu, C. W.

PY - 2007/3

Y1 - 2007/3

N2 - We report intensive studies on the cobalt oxide superconductors Nax CoO2 · 1.3 H2 O via 59Co NMR and NQR measurements. In the sample with x = 0.26 and Tc = 4.6, we find that the spin-lattice relaxation rate 1 / T1 shows a T3 variation below Tc and down to very low temperatures, which indicates the presence of line nodes in the superconducting (SC) gap function. We have also studied the spin susceptibility below Tc via the Knight shift measurement. The spin part of the Knight shift decreases below Tc in both the a- and c-directions indicating singlet spin state of the Cooper pairs. Our results strongly suggest that the superconducting state is a d-wave state.

AB - We report intensive studies on the cobalt oxide superconductors Nax CoO2 · 1.3 H2 O via 59Co NMR and NQR measurements. In the sample with x = 0.26 and Tc = 4.6, we find that the spin-lattice relaxation rate 1 / T1 shows a T3 variation below Tc and down to very low temperatures, which indicates the presence of line nodes in the superconducting (SC) gap function. We have also studied the spin susceptibility below Tc via the Knight shift measurement. The spin part of the Knight shift decreases below Tc in both the a- and c-directions indicating singlet spin state of the Cooper pairs. Our results strongly suggest that the superconducting state is a d-wave state.

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DO - 10.1016/j.jmmm.2006.10.531

M3 - Article

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SN - 0304-8853

VL - 310

SP - 687

EP - 689

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

IS - 2 SUPPL. PART 1

ER -

NMR and NQR studies of the pairing symmetry in the superconducting state of Na_x CoO₂ · 1.3 H₂ O

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