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SUMMARY:Unconventional Superconductivity and Quantum Criticality in CeCoIn
 5 - Dr Cigdem Capan (Louisiana State University)
DTSTART:20060619T090000Z
DTEND:20060619T100000Z
UID:TALK5034@talks.cam.ac.uk
CONTACT:Michael Sutherland
DESCRIPTION:A weak attractive interaction among electrons can lead to a ma
 croscopic\nquantum state in which the electrons are paired. The main prope
 rty of this\nstate is to conduct electricity without dissipation. Metallic
  systems which\nexhibit it are known as superconductors. I will start by r
 eviewing our\ncurrent understanding of this phenomenon.  At high magnetic 
 fields\,\nsuperconductivity can survive via the formation of inhomogeneous
  states.\nThis is particularly true for the inhomogeneous superconducting 
 state called\nthe "Fulde-Ferrell-Larkin-Ovchnnikov" (FFLO) state. This sta
 te appears as a\nconsequence of the finite momentum of the superconducting
  electron pairs.\nAlthough it has been predicted more than 40 years ago\, 
 its experimental\nobservation has been a challenge. In the first part of m
 y talk\, I will\nreview recent experimental results suggesting that the FF
 LO state is\nrealized in a heavy fermion superconductor\, CeCoIn5\, with a
  particular\nemphasis on what we learn from the anisotropy of thermal cond
 uctivity about\nthe spatial structure of the superconducting wavefunction.
  The second part\nof my talk will be devoted to the anomalous metallic sta
 te that leads to the\nunconventional superconductivity in CeCoIn5. I will 
 review transport and\nthermodynamic evidence for an effective mass enhance
 ment as the magnetic\nfield approaches the superconducting upper critical 
 field Hc2 from above. In\nour current understanding of heavy fermion compo
 unds\, this is attributed to\na continuous ground state transformation als
 o called a quantum phase\ntransition. I will discuss the possible origin o
 f a quantum phase transition\nclose to Hc2 in CeCoIn5 and its relation to 
 superconductivity\, based on the\nevolution of the magnetic field phase di
 agram with pressure and Sn-doping.\n
LOCATION:Mott Seminar Room\, Cavendish Laboratory\, Department of Physics
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