Tricritical point and wing structure in the itinerant ferromagnet UGe 2

V. Taufour, D. Aoki, G. Knebel, J. Flouquet

Research output: Contribution to journalArticle

100 Citations (Scopus)

Abstract

Precise resistivity measurements on the ferromagnetic superconductor UGe2 under pressure p and magnetic field H reveal a previously unobserved change of the anomaly at the Curie temperature. Therefore, the tricritical point (TCP) where the paramagnetic-to-ferromagnetic transition changes from a second order to a first order transition is located in the p-T phase diagram. Moreover, the evolution of the TCP can be followed under the magnetic field in the same way. It is the first report of the boundary of the first order plane which appears in the p-T-H phase diagram of weak itinerant ferromagnets. This line of critical points starts from the TCP and will terminate at a quantum critical point. These measurements provide the first estimation of the location of the quantum critical point in the p-H plane and will inspire similar studies of the other weak itinerant ferromagnets.

Original languageEnglish
Article number217201
JournalPhysical Review Letters
Volume105
Issue number21
DOIs
Publication statusPublished - 2010 Nov 15
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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