Correlation between Superconductivity and Ferromagnetism in UGe2

We measured the ac magnetic susceptibility of the ferromagnet UGe2 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, PX∼12 kbar at which an unknown p...

Full description

Saved in:
Bibliographic Details
Published in:Journal of the Physical Society of Japan 2005-03, Vol.74 (3), p.855
Main Authors: Nakane, Hiroyuki, Motoyama, Gaku, Nishioka, Takashi, K. Sato, Noriaki
Format: Article
Language:English
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We measured the ac magnetic susceptibility of the ferromagnet UGe2 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, PX∼12 kbar at which an unknown phase transition terminates and PFM∼16 kbar at which a Curie temperature is suppressed to zero. We observed the following features in the vicinity of PX: the discontinuity in the plot of superconducting transition temperature versus pressure, the maximum superconducting volume fraction in contrast to the small volume fraction near PFM, 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 PX. We conclude therefore that it is the critical point PX, rather than PFM, that plays a crucial role in the appearance of the superconductivity.
ISSN:0031-9015
1347-4073
DOI:10.1143/jpsj.74.855