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Condensed Matter Colloquium Thursday, October 6, 2011
 

Summary: Condensed Matter Colloquium
Thursday, October 6, 2011
2 pm, Room 1201
Refreshments at 1:30 pm in Room 1305F
Alexander Gurevich
Old Dominion University, Norfolk, VA
Fe-based superconductors at high magnetic fields
Low carrier densities and short coherence lengths in the recently discovered semi-
metallic Fe-based superconductors (FBS) can result in exotic behaviors at strong
magnetic fields due to the interplay of multiband superconductivity, unconventional
pairing symmetry and the Zeeman and orbital pairbreaking. In this talk I will give an
overview of these effects in FBS, particularly the anomalous temperature
dependencies of the upper critical field Hc2(T) which often extrapolate to Hc2 > 100
Tesla at low temperatures. The materials features of FBS and the multiband są
pairing
symmetry with the sign change of the order parameter on different sheets of the
Fermi surface can significantly increase Hc2(T) and facilitate the Fulde-Ferrel-Larkin-
Ovchinnikov (FFLO) transition to the state with a spatially modulated order
parameter. Small shifts of the chemical potential upon doping of FBS can produce
new small pockets of the Fermi surface, triggering the FFLO instability due to the

  

Source: Appelbaum, Ian - Department of Physics, University of Maryland at College Park

 

Collections: Engineering; Materials Science