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Fermi surface and superconductivity in URhGe and other nonsymmorphic crystals

10/01/2013, Ed Yeland, University of St Andrews, Scotland,

 

URhGe orders ferromagnetically below 9.5K and coexisting superconductivity develops in the cleanest samples at 300mK. For magnetic fields applied along the b-axis, superconductivity is first destroyed at a critical field 2T but a second superconducting phase forms at higher fields 8<B<12T. I discuss the 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 diagram. New quantum oscillation results have revealed other sections of the Fermi surface including quasiparticles of  100 electron masses. I compare the experimental Fermi surface with that obtained from electronic structure calculations and discuss the possible role of symmetry required degeneracies in the electronic structure in this and other materials.