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URL:https://murmitoyen.com/events/vanille/udem/detail/803812-the-quantum-cr
 itical-point-of-cuprate-superconductors-louis-taillefer-sherbrooke
LOCATION:Université de Montréal - Pavillon J.-Armand-Bombardier\, 5155\, 
 chemin de la rampe \, Montréal\, QC\, Canada\, H3T 2B2
SUMMARY:The quantum critical point of cuprate superconductors - Louis Taill
 efer (Sherbrooke)
DESCRIPTION:The quantum critical point of cuprate superconductorsLouis Tail
 leferInstitut Quantique\, Département de physique\, Université de Sherbr
 ookeCanadian Institute for Advanced Research\, Toronto\, Canada
\nAbstract
 : By suppressing superconductivity with a large magnetic field\, we have i
 nvestigated the metallic ground state of several cuprate superconductors i
 n the T = 0 limit (YBCO\, Bi2212\, LSCO\, Nd-LSCO\, Eu-LSCO\, Bi2201)\, vi
 a measurements of resistivity\, Hall and Seebeck coefficients\, thermal co
 nductivity and specific heat. We observe a sharp transition at a critical 
 doping p*\, into the enigmatic pseudogap phase. The key signature is a dro
 p in carrier density n from n = 1 + p above p* to n = p below p* [1\,2]\, 
 signaling a major transformation of the Fermi surface. At p*\, we observe 
 the classic signatures of quantum criticality: the electrical resistivity 
 is linear in T at low T [2\,3\,4] and the electronic specific heat Cel sho
 ws a sharp peak at p*\, where it varies in temperature as Cel ~ – T logT
  [5]. Understanding the mechanisms responsible for these various signature
 s will help elucidate the nature of the enigmatic pseudogap phase of cupra
 tes.[1] Badoux et al.\, Nature 531\, 210 (2016). [2] Collignon et al.\, Ph
 ys. Rev. B 95\, 224517 (2017). [3] Daou et al.\, Nat. Phys. 5\, 31 (2009).
  [4] Legros et al.\, arXiv:1805.02512. [5] Michon et al.\, arXiv:1804.0850
 2.
\nLien vers le site web du professeur Taillefer.
\nCette conférence es
 t présentée par le RQMP Versant Nord du Département de physique de 
 l'Université de Montréal et de Génie physique de la Polytechnique.
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