Heat-capacity anomalies at Tsc and T* in the ferromagnetic superconductor UGe2
N. Tateiwa, T. C. Kobayashi, K. Amaya, Y. Haga, R. Settai, Y. Ōnuki
DOI 10.1103/PhysRevB.69.180513 · Physical Review B
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Abstract
The heat-capacity and magnetization measurements under high pressure have been carried out in a ferromagnetic superconductor UGe2. Both measurements were done using a same pressure cell in order to obtain both data for one pressure. Contrary to the heat capacity at ambient pressure, an anomaly is found in the heat capacity at the characteristic temperature T* where the magnetization shows an anomalous enhancement under high pressure where the superconductivity appears. This suggests that a thermodynamic phase transition takes place at T* at least under high pressure slightly below Pc* where T* becomes zero. The heat-capacity anomaly associated with the superconducting transition is also investigated, where a clear peak of C/T is observed in a narrow pressure region (ΔP∼0.1GPa) around Pc* contrary to the previous results of the resistivity measurement. Present results suggest the importance of the thermodynamic critical point Pc* for the appearance of the superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| UGe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.6 | 1.22 GPa | midpoint |
| UGe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.72 | 1.22 GPa | zero_resistance |
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