Hamburg 2001 – scientific programme

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TT: Tiefe Temperaturen

TT 5: Fachsymposium 1: Unkonventionelle Supraleitung

TT 5.1: Invited Talk

Monday, March 26, 2001, 14:30–15:00, A

A ferromagnetic spin triplet superconductor, UGe2. — •Andrew Huxley, Ilya Sheikin, Nolwenn Kernavanois, Georg Knebel, Eric Ressouche, Roberto Calemczuk, Daniel Braithwaite, and Jacques Flouquet — DRFMC/SPSMS, CEA Grenoble, Grenoble 38054, France

FS1: Unconventional superconductors

The identification of a spin triplet superfluid phase in 3He naturally led to more general theoretical predictions that spin triplet superconductivity might occur near to a ferromagnetic instability in some metals. The talk will address the recent discovery of superconductivity near to a ferromagnetic quantum critical point in UGe2, where surprisingly superconductivity has only been detected in the ferromagnetic phase and not also at pressures above the critical pressure for the suppression of ferromagnetism. Evidence is provided that the superconductivity is indeed a bulk property and that the ferromagnetic component of the order is still present at a pressure and temperature where superconductivity is found. An additional transition within the ferromagnetic state occrus at a characteristic temperature Tx that decreases with pressure and disappears at a pressure, Px, close to the pressure at which the superconductivity is strongest. This transition is also induced by a magnetic field at pressures just above Px which could explain an unusual re-entrant behaviour of the superconductivity with field at these pressures.