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DTSTAMP:20260424T143152Z
UID:1699524000@ist.ac.at
DTSTART:20231109T110000
DTEND:20231109T120000
DESCRIPTION:Speaker: Arkady Shekhter\nhosted by Kimberly Modic\nAbstract: Q
 uantum-critical metal CeCoIn5 exhibits T-linear resistivity and inverse-T-
 square Hall angle\, similar to the cuprates. Unlike cuprates\, it has very
  low Fermi- and superconducting energy scales allowing a more thorough stu
 dy of the thermodynamics of its quantum criticality. After 20 years of suc
 h studies\, the microscopic origin of metallic criticality in CeCoIn5 in g
 eneral\, and the nature of its interaction with the magnetic field\, in pa
 rticular\, are still in flux. Thermal impedance spectroscopy allows acces
 s to the electronic density of states in two independent ways—via the sp
 ecific heat and the nuclear spin-lattice relaxation rate — simultaneousl
 y in the same measurement. Magnetic field and temperature dependence of t
 he nuclear spin-lattice relaxation rate show that the density of states on
  the Fermi surface in CeCoIn5 is determined entirely by the energy-scale c
 ompetition near the quantum critical point. Such dynamic effect of magneti
 c field near quantum critical point has been established in the cuprates t
 hrough magnetotransport and Hall measurements. However\, in CeCoIn5\, dir
 ect interpretation of magnetic field and temperature dependence of the spe
 cific heat in terms of such energy-scale competition reveals an excess ent
 ropy in the normal state. This suggests quantum critical physics beyond ma
 ss renormalization on the Fermi surface\, e.g.\, the second “flavor” o
 f quantum critical bosons. We argue that such a multi-flavour quantum crit
 icality is at play in a broader class of quantum critical systems. 
LOCATION:Heinzel Seminar Room\, Office Building West\, ISTA
ORGANIZER:dbooukalo@ist.ac.at
SUMMARY:Arkady Shekhter: Multi-flavor quantum criticality
URL:https://talks-calendar.ista.ac.at/events/4570
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