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SUMMARY:Magnetic field-induced anisotropy in specific heat and transport p
 roperties of unconventional superconductors. - Ilya Vekhter\, Louisiana St
 ate University
DTSTART:20110317T141500Z
DTEND:20110317T151500Z
UID:TALK29929@talks.cam.ac.uk
CONTACT:Dr G Moller
DESCRIPTION:The energy gap in many novel superconductors is highly\nanisot
 ropic\, with either nodes (zeroes) or deep minima at the Fermi\nsurface. L
 ocating these nodes\, i.e. identifying the directions along\nwhich the gap
  vanishes is a crucial step in identifying the correct\nunderlying pairing
  interactions. I will show that rotation of the\napplied magnetic field re
 lative to the nodes produces oscillations in\nthe specific heat and electr
 onic thermal conductivity that can be used\nto determine the location of t
 he gap nodes or minima from bulk\nmeasurements. I will review the relevant
  experimental results\, and\ndescribe the current status of the theoretica
 l underpinnings of these\nmeasurements\, emphasizing the new physics that 
 resolved apparent\ncontradictions between different probes. I will pay spe
 cial attention\nto the inversion of the anisotropy as a function of temper
 ature and\nfield\, theoretically predicted and recently found experimental
 ly. I\nwill provide a comparison of experiment and theory in the 115 heavy
  fermion compounds\, two-dimensional organic superconductors\, and pnictid
 es.
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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