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Les événements de février 2017


  • Séminaire des doctorants

    • Jeudi 23 février 11:00-12:00 - Wojciech Tabis - Laboratoire National des Champs Magnétiques Intenses - Toulouse

      Charge density wave order and the carrier density in cuprate superconductors

      Résumé : A longstanding conundrum regarding the cuprates concerns the nature of the normal state from which the superconductivity develops. For a wide range of charge carrier concentration, the suppression of the superconductivity upon increasing temperature or applying magnetic field leads to the pseudogap phase, a state which is considered a key stumbling block toward understanding the high-Tc superconductivity. The connection of the pseudogap to Mott insulator at low carrier concentrations remains ambiguous and its relation to the charge order, that reconstructs the Fermi surface at intermediate doping, is still unclear. I will discuss the doping dependent study of the CDW order and its consequence on the electronic transport properties in HgBa2CuO4+d [1]. Furthermore, our Hall coefficient measurements on YBa2CuO6+d, in magnetic fields up to 88 T, allowed us to test the relationship between the CDW order and the pseudogap phase [2]. The systematic study of the Hall coefficient revealed a sharp loss of one carrier per Cu atom upon entering the pseudogap in T = 0 K limit [2]. I will discuss the impact of the charge localization on the electronic transport properties in La2-xSrxCuO4 [3] and present some possible underlying mechanisms.
      1. W. Tabis et al., Nat. Comm. 5, 5875 (2014) / W. Tabis et al., preprint
      2. S. Badoux et al., Nature 531, 210 (2016)
      3. F. Laliberte et al., arXiv:1606.04491 (2016)

      Lieu : RDC, Bât. T-18, Parc Club Orsay


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