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SUMMARY:Fermi surface and superconductivity in URhGe and other     nonsymm
 orphic crystals - Ed Yelland\, University of Edinburgh and University of S
 t Andrews
DTSTART:20130123T111500Z
DTEND:20130123T121500Z
UID:TALK41209@talks.cam.ac.uk
CONTACT:Michael Sutherland
DESCRIPTION:URhGe orders ferromagnetically below 9.5K and coexisting super
 conductivity develops in the cleanest samples at ~300mK. For magnetic fiel
 ds applied along the b-axis\, superconductivity is first destroyed at a cr
 itical field ~2T but a second superconducting phase forms at higher fields
  8<B<12T. I discuss the apparent role of a small\, strongly magnetic field
 -dependent Fermi surface pocket of heavy quasiparticles in driving the re-
 entrant superconductivity [Yelland et al.\, Nat. Phys. 7\, 890 (2011)] and
  how this affects our view of the magnetic and superconducting phase diagr
 am. New quantum oscillation results have revealed other sections of the Fe
 rmi surface including quasiparticles of  ~100 electron masses. I compare t
 he experimental Fermi surface with that obtained from electronic structure
  calculations and discuss the possible role of symmetry required degenerac
 ies in the electronic structure in this and other materials.
LOCATION:TCM Seminar Room\, Cavendish Laboratory\, Department of Physics
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