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

Kazuaki Matano, Guo-Qing Zheng, D. P. Chen, C. T. Lin, J. Cmaidalka, R. L. Meng, C. W. Chu

Research output: Contribution to journalArticle

1 Citation (Scopus)

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.

Original languageEnglish
Pages (from-to)687-689
Number of pages3
JournalJournal of Magnetism and Magnetic Materials
Volume310
Issue number2 SUPPL. PART 1
DOIs
Publication statusPublished - Mar 2007

Fingerprint

Nuclear magnetic resonance
Oxide superconductors
nuclear magnetic resonance
Spin-lattice relaxation
symmetry
Cobalt
cobalt oxides
spin-lattice relaxation
magnetic permeability
Temperature
Direction compound
cobalt oxide

Keywords

  • Na CoO · y H O
  • NMR
  • NQR
  • Superconductivity
  • Triangular lattice

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

NMR and NQR studies of the pairing symmetry in the superconducting state of Nax CoO2 · 1.3 H2 O. / Matano, Kazuaki; Zheng, Guo-Qing; Chen, D. P.; Lin, C. T.; Cmaidalka, J.; Meng, R. L.; Chu, C. W.

In: Journal of Magnetism and Magnetic Materials, Vol. 310, No. 2 SUPPL. PART 1, 03.2007, p. 687-689.

Research output: Contribution to journalArticle

Matano, Kazuaki ; Zheng, Guo-Qing ; Chen, D. P. ; Lin, C. T. ; Cmaidalka, J. ; Meng, R. L. ; Chu, C. W. / NMR and NQR studies of the pairing symmetry in the superconducting state of Nax CoO2 · 1.3 H2 O. In: Journal of Magnetism and Magnetic Materials. 2007 ; Vol. 310, No. 2 SUPPL. PART 1. pp. 687-689.
@article{3b527cbad9e747728496bc43bb4bd7a1,
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.",
keywords = "Na CoO · y H O, NMR, NQR, Superconductivity, Triangular lattice",
author = "Kazuaki Matano and Guo-Qing Zheng and Chen, {D. P.} and Lin, {C. T.} and J. Cmaidalka and Meng, {R. L.} and Chu, {C. W.}",
year = "2007",
month = "3",
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",
number = "2 SUPPL. PART 1",

}

TY - JOUR

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

AU - Matano, Kazuaki

AU - Zheng, Guo-Qing

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.

KW - Na CoO · y H O

KW - NMR

KW - NQR

KW - Superconductivity

KW - Triangular lattice

UR - http://www.scopus.com/inward/record.url?scp=33847370425&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33847370425&partnerID=8YFLogxK

U2 - 10.1016/j.jmmm.2006.10.531

DO - 10.1016/j.jmmm.2006.10.531

M3 - Article

AN - SCOPUS:33847370425

VL - 310

SP - 687

EP - 689

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

SN - 0304-8853

IS - 2 SUPPL. PART 1

ER -