Spin singlet pairing in the superconducting state of NaxCoO2∙1.3H2O: Evidence from a Co59 Knight shift in a single crystal
Guo-qing Zheng, Kazuaki Matano, D. P. Chen, C. T. Lin
DOI 10.1103/PhysRevB.73.180503 · Physical Review B
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Abstract
We report a Co59 Knight-shift measurement in a single crystal of the cobalt oxide superconductor NaxCoO2∙1.3H2O (Tc=4.25K). We find that the shift due to the spin susceptibility, Ks, is substantially large and anisotropic, with the spin shift along the a-axis Kas being two times that along the c-axis Kcs. The shift decreases with decreasing temperature (T) down to T≈100 K, then becomes a constant until superconductivity sets in. Both Kas and Kcs decrease below Tc. Our results indicate unambiguously that the electron pairing in the superconducting state is in the spin singlet form.
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. | 4.25 | Pressure not reported | onset |
| Na0.42CoO2.1.3H2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.25 | Pressure not reported | onset |
| (Pr0.91La0.09)2CeCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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