Magnetic and superconducting nature of Na0.35CoO2⋅yH2O and Na0.35CoO2⋅yD2O investigated by muon-spin spectroscopy
Jun Sugiyama, Yutaka Ikedo, Martin Månsson, Jess H. Brewer, Scott L. Stubbs, Eduardo J. Ansaldo, Kim H. Chow, James S. Lord, Hiroto Ohta, Chishiro Michioka, Kazuyoshi Yoshimura
DOI 10.1103/PhysRevB.82.214505 · Physical Review B
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Abstract
In order to clarify the carrier density dependence of the microscopic magnetic nature in NaxCoO2⋅yH2O, we have performed a positive muon-spin rotation/relaxation (μ+SR) study of H2O and D2O intercalated samples. Based on the zero-field (ZF) μ+SR measurements, there was no clear difference between the two superconducting phases (SCI and SCII). This is also likely to exclude the exotic scenario for the superconductivity of the SCII phase, in which the superconducting state breaks the time-reversal symmetry of the Cooper pairs, resulting in the appearance of a weak internal magnetic field below Tc. Furthermore, the ZF spectrum for the H2O intercalated sample exhibits a clear oscillation in the whole T range measured (1.4–100 K), suggesting the formation of “[H3O]+-like” H2μ+O ions in the sample. The absence of the oscillation in the D2O-intercalated sample also evidences the presence of the H2μ+O complex. Considering the fraction of the H2μ+O signal, we have demonstrated the coexistence of [H3O]+ ions and H2O in this compound.
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. | 4.7 | Pressure unresolved | onset |
| 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 unresolved | onset |
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