Abstract
Recently, co-existence of the ferromagnetism and superconductivity was reported in the high-pressure region (1.0–1.6GPa) in UGe2. We performed the heat capacity measurement on UGe2 under high pressure. At 1.15GPa, we found a peak corresponding to the superconducting transition. The superconducting temperature TSC and ΔC/(γTSC) are 0.6K and 0.25, respectively. The superconducting transition was also confirmed by the appearance of the Meissner effect in the AC susceptibility. From these results, we confirm a bulk nature of the superconductivity in UGe2. The value of C/T (∼95mJ/molK2) just above TSC at 1.15GPa is as much as 3 times larger than that at ambient pressure, which indicates a large mass enhancement of quasiparticles under high pressure.
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