Pressure dependence of the superconducting transition and electron correlations in NaxCoO2∙1.3H2O
E. Kusano, S. Kawasaki, K. Matano, Guo-qing Zheng, R. L. Meng, J. Cmaidalka, C. W. Chu
DOI 10.1103/PhysRevB.76.100506 · Physical Review B
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Abstract
We report Tc and Co59 nuclear quadrupole resonance measurements on the cobalt oxide superconductor NaxCoO2∙1.3H2O (Tc=4.8K) under hydrostatic pressure (P) up to 2.36GPa. Tc decreases with increasing pressure at an average rate of −0.49±0.09K∕GPa. At low pressures P⩽0.49GPa, 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 1.93GPa, 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=0.49GPa shows a T3 variation below Tc down to T∼0.12Tc, which provides compelling evidence for the presence of line nodes in the superconducting gap function.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NaxCoO2.1.3H2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.8 | Pressure unresolved | onset |
| NaxCoO2.1.3H2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.8 | 0.49 GPa | onset |
| NaxCoO2.1.3H2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.7 | Pressure not reported | unknown |
| NaxCoO2.1.3H2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.6 | Pressure not reported | unknown |
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