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SUMMARY:Quantum criticality points - heavy fermions and beyond
DTSTART:20121116T110000
DTSTAMP:20260510T185819Z
UID:267ef0542fb9ff4c77a8ab5d55eaf158b7bf9773d91110d6206458bf
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Silke Bühler - Paschen\, Institute of Solid State Physi
 cs\, Vienna University of Technology\nTemperature agitates. To bring matte
 r to a quiet and well defined state it is necessary to cool it down. Yet\,
  there are situations in which certain degrees of freedom resist freezing 
 out and remain violently fluctuating even at absolute zero in temperature.
  This phenomenon of “quantum criticality” has been reported in distinc
 t systems such as high-temperature superconductors\, heavy fermion compoun
 ds\, metamagnets\, ferroelectrics\, 3He films\, quantum dots\, or cold ato
 m systems and is a topic of intense worldwide research. This talk will spo
 tlight heavy fermion compounds which have in recent years emerged as proto
 typical quantum critical systems. Studies in anisotropic heavy-fermion com
 pounds have shown that different types of quantum critical points (QCPs) m
 ay be induced by the variation of different control parameters (magnetic f
 ield\, chemical or external pressure)\, raising the question of the extent
  to which heavy-fermion quantum criticality is universal. Recently\, we ha
 ve made the unexpected observation of a cubic heavy-fermion material exhib
 iting a QCP that is accompanied by an abrupt change of Fermi surface. Prev
 iously\, this kind of QCP was believed to require reduced dimensionality. 
 From these results we have proposed a materials-based global phase diagram
  for heavy fermion compounds that points to the importance of dimensionali
 ty - and may serve as guide in the search for a unified theoretical descri
 ption [1].\n\n[1] J. Custers\, K.-A. Lorenzer\, M. Müller\, A. Prokofiev\
 , A. Sidorenko\, H. Winkler\, A. M. Strydom\, Y. Shimura\, T. Sakakibara\,
  R. Yu\, Q. Si\, and S. Paschen\, Nature Materials 11\, 189 (2012).
LOCATION:PH L1 503 http://plan.epfl.ch/?room=PHL1503
STATUS:CONFIRMED
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