Heat Capacity of the Pressure-induced Superconductivity in Itinerant Ferromagnet UGe${}_2$

Abstract

Recently co-existence of the ferromagnetism and superconductivity was reported in the high-pressure region (1.0-1.6 GPa) in UGe${}_2$. We performed the heat capacity measurement on UGe${}_2$ under high pressure. At 1.13 GPa, we found a peak corresponding to the superconducting transition. The superconducting temperature $T_{SC}$ and $\Delta C/(\gamma T_{SC})$ are 0.6 K and 0.25, respectively. The superconducting transition was also confirmed by the appearance of the Meissner effect in the {\it ac} susceptibility. From these results, we confirm a bulk nature of the superconductivity in UGe${}_2$. The value of $C/T$ ($\sim$ 95 mJ/moleK${}^2$) just above $T_{SC}$ at 1.15 GPa is as much as 3 times larger than that at ambient pressure, which indicates a large mass enhancement of quasiparticles under high pressure.

submitted to the International Conference on Strongly Correlated Electron Systems 2001

References in corpus (1)

• Magnetic Properties of a Pressure-induced Superconductor UGe${}_2$

Cited by in corpus (2)

• Evidence for ferromagnetic spin-pairing superconductivity in UGe${}_2$: A ${}^{73}$Ge-NQR study under pressure
• Stoner gap in the superconducting ferromagnet UGe2