Pressure dependence of the superconducting transition and electron correlations in Nax Co O2·1.3 H2 O

E. Kusano, Shinji Kawasaki, Kazuaki Matano, Guo-Qing Zheng, R. L. Meng, J. Cmaidalka, C. W. Chu

Research output: Contribution to journalArticle

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Abstract

We report Tc and Co59 nuclear quadrupole resonance measurements on the cobalt oxide superconductor Nax Co O2·1.3 H2 O (Tc =4.8 K) under hydrostatic pressure (P) up to 2.36 GPa. Tc decreases with increasing pressure at an average rate of -0.49±0.09 K/GPa. At low pressures P≤0.49 GPa, the decrease of Tc 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 Tc is mainly due to a reduction of the DOS. These results indicate that the electronic and magnetic state of Co is primarily responsible for the superconductivity. The spin-lattice relaxation rate 1/T1 at P=0.49 GPa shows a T3 variation below Tc down to T∼0.12 Tc, which provides compelling evidence for the presence of line nodes in the superconducting gap function.

Original languageEnglish
Article number100506
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume76
Issue number10
DOIs
Publication statusPublished - Sep 19 2007

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Electron correlations
Electron transitions
pressure dependence
cobalt oxides
nuclear quadrupole resonance
Nuclear quadrupole resonance
hydrostatic pressure
spin-lattice relaxation
Oxide superconductors
electrons
superconductivity
Spin-lattice relaxation
low pressure
Hydrostatic pressure
Superconductivity
Fermi level
Cobalt
electronics

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Pressure dependence of the superconducting transition and electron correlations in Nax Co O2·1.3 H2 O. / Kusano, E.; Kawasaki, Shinji; Matano, Kazuaki; Zheng, Guo-Qing; Meng, R. L.; Cmaidalka, J.; Chu, C. W.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 76, No. 10, 100506, 19.09.2007.

Research output: Contribution to journalArticle

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AU - Kusano, E.

AU - Kawasaki, Shinji

AU - Matano, Kazuaki

AU - Zheng, Guo-Qing

AU - Meng, R. L.

AU - Cmaidalka, J.

AU - Chu, C. W.

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N2 - We report Tc and Co59 nuclear quadrupole resonance measurements on the cobalt oxide superconductor Nax Co O2·1.3 H2 O (Tc =4.8 K) under hydrostatic pressure (P) up to 2.36 GPa. Tc decreases with increasing pressure at an average rate of -0.49±0.09 K/GPa. At low pressures P≤0.49 GPa, the decrease of Tc 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 Tc is mainly due to a reduction of the DOS. These results indicate that the electronic and magnetic state of Co is primarily responsible for the superconductivity. The spin-lattice relaxation rate 1/T1 at P=0.49 GPa shows a T3 variation below Tc down to T∼0.12 Tc, which provides compelling evidence for the presence of line nodes in the superconducting gap function.

AB - We report Tc and Co59 nuclear quadrupole resonance measurements on the cobalt oxide superconductor Nax Co O2·1.3 H2 O (Tc =4.8 K) under hydrostatic pressure (P) up to 2.36 GPa. Tc decreases with increasing pressure at an average rate of -0.49±0.09 K/GPa. At low pressures P≤0.49 GPa, the decrease of Tc 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 Tc is mainly due to a reduction of the DOS. These results indicate that the electronic and magnetic state of Co is primarily responsible for the superconductivity. The spin-lattice relaxation rate 1/T1 at P=0.49 GPa shows a T3 variation below Tc down to T∼0.12 Tc, which provides compelling evidence for the presence of line nodes in the superconducting gap function.

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