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SUMMARY:Quantum criticality and Fermi surface instabilities in the ferroma
 gnetic superconductor UCoGe - Gael Bastien\, 1. Univ. Grenoble Alpes\, Fra
 nce.  2.INAC/SPSMS\, CEA-Grenoble\, France.
DTSTART:20161124T114500Z
DTEND:20161124T124500Z
UID:TALK68956@talks.cam.ac.uk
CONTACT:Helen Verrechia
DESCRIPTION:UCoGe shows microscopic coexistence of ferromagnetism and supe
 rconductivity with a Curie temperature TC=2.7K and a superconducting trans
 ition temperature Tsc=0.6K. The Curie temperature decreases with pressure 
 and vanishes at a critical pressure: pc~1GPa. We measured resistivity and 
 magnetoresistance for field along c axis in UCoGe up to 10.5GPa. Supercond
 uctivity was observed both below pc and above pc up to 4 GPa with a maximu
 m of Tsc just below the critical pressure. Non Fermi liquid behavior can b
 e observed on a broad pressure range around the critical pressure. The tem
 perature and pressure dependence of the upper critical field shows the str
 ong influence of magnetic field on the pairing interaction. We report also
  here magnetoresistance Hall effect and thermopower measurements on UCoGe 
 under high magnetic field applied along the easy magnetization axis c. Qua
 ntum oscillations were detected both in resistivity and Seebeck effect. A 
 cascade of Fermi surface reconstructions without magnetic phase transition
 s were observed in high magnetic fields up to 34 T and they were discussed
  in terms of topological Lifshitz transitions. Shubnikov-de Haas oscillati
 ons were also measured under pressure up to 2.5GPa and the evolution of Fe
 rmi surface through the critical pressure is relatively small. 
LOCATION:Mott Seminar Room (531)\, Cavendish Laboratory\, Department of Ph
 ysics
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