Pressure dependence of the superconducting transition and electron correlations in Na_xCoO_2 \cdot 1.3H_2O

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dc.creatorKusano, E.
dc.creatorKawasaki, S.
dc.creatorMatano, K.
dc.creatorZheng, G. -q.
dc.creatorMeng, R. L.
dc.creatorCmaidalka, J.
dc.creatorChu, C. W.
dc.date2007-12-04
dc.date.accessioned2026-07-07T08:47:08Z
dc.date.available2026-07-07T08:47:08Z
dc.descriptionWe report T_c and ^{59}Co nuclear quadrupole resonance (NQR) measurements on the cobalt oxide superconductor Na_{x}CoO_{2}\cdot 1.3H_{2}O (T_c=4.8 K) under hydrostatic pressure (P) up to 2.36 GPa. T_c decreases with increasing pressure at an average rate of -0.49\pm0.09 K/GPa. At low pressures P\leq0.49 GPa, the decrease of T_c is accompanied by a weakening of the spin correlations at a finite wave vector and a reduction of the density of states (DOS) at the Fermi level. At high pressures above 1.93 GPa, however, the decrease of T_c is mainly due to a reduction of the DOS. These results indicate that the electronic/magnetic state of Co is primarily responsible for the superconductivity. The spin-lattice relaxation rate 1/T_1 at P=0.49 GPa shows a T^3 variation below T_c down to T\sim 0.12T_c, which provides compelling evidence for the presence of line nodes in the superconducting gap function.
dc.descriptionpublished on 19, Sept. 2007 on Phys. Rev. B
dc.identifierhttps://arxiv.org/abs/0712.0419
dc.identifierhttp://arxiv.org/abs/0712.0419
dc.identifierPhys. Rev. B76, 100506(R) (2007)
dc.identifierdoi:10.1103/PhysRevB.76.100506
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/143494
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titlePressure dependence of the superconducting transition and electron correlations in Na_xCoO_2 \cdot 1.3H_2O
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