Possible unconventional superconductivity in NaxCoO2·yH2O probed by muon spin rotation and relaxation
Wataru Higemoto, Kazuki Ohishi, Akihiro Koda, Shanta Ranjan Saha, Ryosuke Kadono, Kenji Ishida, Kazunori Takada, Hiroya Sakurai, Eiji Takayama-Muromachi, Takayoshi Sasaki
DOI 10.1103/PhysRevB.70.134508 · Physical Review B
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Abstract
The superconducting property of sodium cobalt oxyhydrate, Na0.35CoO2·1.3H2O(Tc=4.5K), has been studied by means of muon spin rotation/relaxation down to 2K. It was found that the zero-field muon spin relaxation rate is independent of the temperature, indicating that no static magnetism appears in this compound, at least above 2K. The result also provides evidence of no breaking of time-reversal symmetry for the superconductivity. Meanwhile, the muon Knight shift at 60kOe, which is proportional to the local spin susceptibility, shows no obvious reduction below Tc. Considering these observations, possible unconventional superconductivity of Na0.35CoO2∙1.3H2O is discussed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Na0.35CoO2·1.3H2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.5 | Pressure not reported | unknown |
| NaxCoO2·yH2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5 | Pressure not reported | unknown |
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