Spin singlet pairing in the superconducting state of NaxCoO2\cdot1.3H2O: evidence from a ^{59}Co Knight shift in a single crystal

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dc.creatorZheng, Guo-qing
dc.creatorMatano, Kazuaki
dc.creatorChen, D. P.
dc.creatorLin, C. T.
dc.date2006-05-09
dc.date.accessioned2026-07-07T07:08:50Z
dc.date.available2026-07-07T07:08:50Z
dc.descriptionWe report a ^{59}Co Knight shift measurement in a single crystal of the cobalt oxide superconductor Na_{x}CoO_2\cdot1.3H_2O (T_c=4.25 K). We find that the shift due to the spin susceptibility, K^s, is substantially large and anisotropic, with the spin shift along the a-axis K^s_a being two times that along the c-axis K^s_c. The shift decreases with decreasing temperature (T) down to T\sim100 K, then becomes a constant until superconductivity sets in. Both K^s_a and K^s_c decrease below T_c. Our results indicate unambiguously that the electron pairing in the superconducting state is in the spin singlet form.
dc.description4 pages, 5 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0605212
dc.identifierhttp://arxiv.org/abs/cond-mat/0605212
dc.identifierPhys. Rev. B 73, 180503(R) (2006)
dc.identifierdoi:10.1103/PhysRevB.73.180503
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/110854
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleSpin singlet pairing in the superconducting state of NaxCoO2\cdot1.3H2O: evidence from a ^{59}Co Knight shift in a single crystal
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