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SUMMARY:Heavy fermion states and quantum criticality - Prof. Yoshichika On
 uki\, Osaka University
DTSTART:20081119T111500Z
DTEND:20081119T121500Z
UID:TALK14932@talks.cam.ac.uk
CONTACT:Michael Sutherland
DESCRIPTION:The heavy fermion state in the f-electron systems is due to co
 mpetition between the\nRKKY interaction and the Kondo effect. The typical 
 compound is CeCu6. To understand\nthe electronic state\, we studied the Fe
 rmi surface properties via de Haas-van Alphen\n(dHvA) experiments and ener
 gy band calculations for CeSn3\, CeRu2Si2\, UPt3\, and\nnowadays\, transur
 anium compounds of NpGe3 and PuIn3\, together with YbCu2Si2.\nPressure is 
 also an important technique to control the electronic state. For example\,
  the\nNéel temperature TN decreases with increasing pressure P and become
 s zero at the\ncritical pressure Pc : TN → 0 for P → Pc. The typical c
 ompound is an antiferromagnet\nCeRhIn5\, which we studied from the dHvA ex
 periment under pressure. A change of the\n4 f-electron states from localiz
 ed to itinerant is realized at Pc ≈ 2.4GPa\, revealing the\nfirst-order 
 phase transition\, together with a divergent tendency of the cyclotron mas
 s at\nPc. It is stressed that appearance of superconductivity in CeRhIn5 i
 s closely related to\nthe heavy fermion state. It is also noted that the p
 arity-mixed novel superconducting\nstate might be realized in a pressure-i
 nduced superconductor CeIrSi3 without inversion\nsymmetry in the crystal s
 tructure.
LOCATION:Mott Seminar Room\, Cavendish Laboratory\, Department of Physics
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