• Metal-insulator crossover in high Tc cuprates: A gauge field approach

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      https://www.ias.ac.in/article/fulltext/pram/058/05-06/0803-0808

    • Keywords

       

      Resistivity; crossover; t-J

    • Abstract

       

      A metal-insulator crossover appears in the experimental data for in-plane resistivity of underdoped cuprates and a range of superconducting cuprates in the presence of a strong magnetic field suppressing superconductivity. We propose an explanation for this phenomenon based on a gauge field theory approach to the t-J model. In this approach, based on a formal spin-charge separation, the low energy effective action describes gapful spinons (with a theoretically derived doping dependence of the gap ms2δ¦ ln δ¦) and holons with finite Fermi surface (ɛF ∼ ) interacting via a gauge field whose basic effect on the spinons is to bind them into overdamped spin waves, shifting their gap by a damping term linear in T, which causes the metal-insulator crossover. The presence of a magnetic field perpendicular to the plane acts by increasing the damping, in turn producing a big positive transverse in-plane magnetoresistance at low T, as experimentally observed.

    • Author Affiliations

       

      PA Marchetti1 ZB Su2 L Yu2 3

      1. Dipartimento di Fisica ‘G.Galilei’ and INFN-Sez. di Padova, Italy
      2. Institute of Theoretical Physics, CAS Beijing - 100080, China
      3. International Centre for Theoretical Physics, Trieste - I-34100, Italy
    • Dates

       
  • Pramana – Journal of Physics | News

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