Abstract
We measured the ac magnetic susceptibility of the ferromagnet UGe 2 that exhibits superconductivity at high pressures within a ferromagnetic phase. It is known that the ferromagnetic phase is separated into two phases and thus there are two critical pressures, namely, P X ∼12 kbar at which an unknown phase transition terminates and P FM ∼16 kbar at which a Curie temperature is suppressed to zero. We observed the following features in the vicinity of P X : the discontinuity in the plot of superconducting transition temperature versus pressure, the maximum superconducting volume fraction in contrast to the small volume fraction near P FM , and the markedly enhanced initial slope of the upper critical magnetic field (exceeding 200 kOe/K). These results indicate that the superconductivity directly correlates with P X . We conclude therefore that it is the critical point P X , rather than P FM , that plays a crucial role in the appearance of the superconductivity.
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