Evidence of nodal superconductivity in Na0.35CoO2·1.3H2O: A specific-heat study
H. D. Yang, J.-Y. Lin, C. P. Sun, Y. C. Kang, C. L. Huang, K. Takada, T. Sasaki, H. Sakurai, E. Takayama-Muromachi
DOI 10.1103/PhysRevB.71.020504 · Physical Review B
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Abstract
Comprehensive low-temperature specific-heat data C(T,H) of Na0.35CoO2·1.3H2O with temperature T down to 0.6K and the magnetic field H up to 8T are presented. In the normal state, the values of γn=13.94mJ∕molK2 and Debye temperature ΘD=362K are reported. At zero field, a very sharp superconducting anomaly was observed at Tc=4.5K with ΔC∕γnsTc=1.45 if the specific-heat jump is normalized to the superconducting volume fraction, which is estimated to be 47.4% based on the consideration of entropy balance at Tc for the second-order superconducting phase transition. In the superconducting state, the electronic contribution Ces at H=0 can be well described by the model of the line nodal order parameter. In low H, δγ(H)∝H1∕2, which is also a manifestation of the line nodes. The behaviors of both Tc(H) and γ(H) suggest the anisotropy of Hc2, or possible crossovers or transitions occurring in the mixed state.
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 | midpoint |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| MgCNi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La1.78Sr0.22CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Sr2RuO4 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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