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SUMMARY:The enigmatic pseudogap phase of cuprate superconductors - Louis T
 aillefer - Institut Quantique\, Université de Sherbrooke\, Sherbrooke\, C
 anada Canadian Institute for Advanced Research
DTSTART:20190618T100000Z
DTEND:20190618T113000Z
UID:TALK124042@talks.cam.ac.uk
CONTACT:Romy Hall
DESCRIPTION:The pseudogap phase of cuprate superconductors is arguably the
  most enigmatic phase of\nquantum matter. We aim to shed new light on this
  phase by investigating the nonsuperconducting\nground state of several cu
 prate materials at low temperature across a wide\ndoping range\, suppressi
 ng superconductivity with a magnetic field.\n\nHall effect and thermal con
 ductivity measurements across the pseudogap critical doping p reveal a sha
 rp drop in carrier density n from n = 1 + p above p to n = p below p [1\,2
 \,3]\, signaling a major transformation of the Fermi surface. From specifi
 c heat measurements\, we observe the classic thermodynamic signatures of q
 uantum criticality: the electronic specific heat Cel shows a sharp peak at
  p\, where it varies in temperature as Cel ~ – T logT [4]. At p and just
  above\, the electrical resistivity is linear in T at low T\, with an inel
 astic scattering rate that obeys the Planckian limit [5]. Finally\, the ps
 eudogap phase is found to have a large negative thermal Hall conductivity\
 , which extends to zero doping [6]. Remarkably\, the Mott insulator La2CuO
 4 exhibits the largest thermal Hall signal of any insulator\, reminiscent 
 of spin liquid states in insulators with spin chirality.\n\nUnderstanding 
 the mechanisms responsible for these various new signatures will help\nelu
 cidate the nature of the pseudogap phase.\n\nReferences\n[1] Badoux et al.
 \, Nature 531\, 210 (2016).\n[2] Collignon et al.\, Physical Review B 95\,
  224517 (2017).\n[3] Michon et al.\, Physical Review X 8\, 041010 (2018).\
 n[4] Michon et al.\, Nature 567\, 218 (2019).\n[5] Legros et al.\, Nature 
 Physics 15\, 142 (2019).\n[6] Grissonnanche et al.\, Nature (in press)\; a
 rXiv:1901.03104 (2019).
LOCATION:Mott Seminar Room (531)\, Cavendish Laboratory\, Department of Ph
 ysics
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