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SUMMARY:High Temperature Superconductivity: Correlation Effects and Itiner
 ant Particles
DTSTART:20140131T141500
DTSTAMP:20260407T020644Z
UID:52e4518ba61ca0ec689edd12538971206959c23d7406149930019ee2
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Neven Barišić\, Institute of Solid State Physics\, Vie
 nna University of Technology\nBio: PhD from EPFL\, 2005\nResearch interes
 ts: the link between the physics of cuprate superconductors and quantum cr
 itical heavy fermion systems\nUnderstanding the nature of quasiparticles i
 n the presence of strong correlations is one of the most challenging topic
 s in physics. In the case of high-temperature superconductors it is consid
 ered that the description of their physical properties is related to the i
 nteraction of itinerant quasiparticles with localized degrees of freedom (
 charge and magnetic). Contrary to conventional wisdom\, we find that the i
 n-plane resistivity in the pseudogap phase(1) of the model cuprate HgBa2Cu
 O4+δ (2\,3) exhibits a quadratic temperature dependence of the resistivit
 y (r µ T2)\, the same behavior that is seen in conventional Fermi liquids
  (4). Furthermore\, for a large variety of cuprate superconductors\, a uni
 versal sheet resistance was found throughout the temperature-doping phase 
 diagram (4). The quadratic frequency dependence and the temperature-freque
 ncy scaling of the optical conductivity confirm the correlated Fermi liqui
 d nature of the itinerant carriers (5). We arrive at the unexpected conclu
 sion that\, even close to the Mott-insulating state at zero doping\, the h
 igh temperature cuprate superconductors behave like Fermi liquids. Similar
  conclusions will be drawn for optimally-doped 122-iron pnictide supercond
 uctors. Current theoretical models can now be benchmarked against these un
 iversal results.\nReferences:\n1. Y. Li\, V. Baledént\, N. Barišić\, Y.
  Cho\, B. Fauque\, Y. Sidis\, G. Yu\, X. Zhao\, P. Bourges\, M. Greven. Na
 ture 455\, 372 (2008).\n2. N. Barišić\, Y. Li\, X. Zhao\, Y. Cho\, G. Ch
 abot-Couture\, G. Yu\, M. Greven. Phys. Rev. B 78\, 054518 (2008).\n3. N. 
 Barišić\, S. Badoux\, M. K. Chan\, C. Dorow\, W. Tabis\, B. Vignolle\, G
 . Yu\, J. Béard\, X. Zhao\, C. Proust\, and Martin Greven. Nature Physics
  9\, 761 (2013).\n4. N. Barišić\, Y. Li\, G. Yu\, X. Zhao\, M. Dressel\,
  A. Smontara\, M. Greven. Proc. Natl. Acad. Sci. 110\, 12235 (2013).\n5. S
 . I. Mirzaei\, D. Stricker\, J. N. Hancock\, C. Berthod\, A. Georges\, E. 
 van Heumen\, M. K. Chan\, X. Zhao\, Y. Li\, M. Greven\, N. Barišić\, D. 
 van der Marel. Proc. Natl. Acad. Sci. 110\, 5774 (2013).
LOCATION:PH L1 503 http://plan.epfl.ch/?room=PHL1503
STATUS:CONFIRMED
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