Blog
About

  • Record: found
  • Abstract: found
  • Article: found
Is Open Access

Inverse correlation between quasiparticle mass and Tc in a cuprate high-Tc superconductor

Preprint

Read this article at

Bookmark
      There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

      Abstract

      Close to a zero temperature transition between ordered and disordered electronic phases, quantum fluctuations can lead to a strong enhancement of the electron mass and to the emergence of competing phases such as superconductivity. A correlation between the existence of such a quantum phase transition and superconductivity is quite well established in some heavy fermion and iron-based superconductors and there have been suggestions that high temperature superconductivity in the copper oxide materials (cuprates) may also be driven by the same mechanism. Close to optimal doping, where the superconducting transition temperature \(T_c\) is maximum in the cuprates, two different phases are known to compete with superconductivity: a poorly understood pseudogap phase and a charge ordered phase. Recent experiments have shown a strong increase in quasiparticle mass \(m^*\) in the cuprate YBa\(_2\)Cu\(_3\)O\(_{7-\delta}\) as optimal doping is approached suggesting that quantum fluctuations of the charge ordered phase may be responsible for the high-\(T_c\) superconductivity. We have tested the robustness of this correlation between \(m^*\) and \(T_c\) by performing quantum oscillation studies on the stoichiometric compound YBa\(_2\)Cu\(_4\)O\(_8\) under hydrostatic pressure. In contrast to the results for YBa\(_2\)Cu\(_3\)O\(_{7-\delta}\), we find that in YBa\(_2\)Cu\(_4\)O\(_8\) the mass decreases as \(T_c\) increases under pressure. This inverse correlation between \(m^*\) and \(T_c\) suggests that quantum fluctuations of the charge order enhance \(m^*\) but do not enhance \(T_c\).

      Related collections

      Most cited references 46

      • Record: found
      • Abstract: found
      • Article: not found

      Long-range incommensurate charge fluctuations in (Y,Nd)Ba2Cu3O(6+x).

      The concept that superconductivity competes with other orders in cuprate superconductors has become increasingly apparent, but obtaining direct evidence with bulk-sensitive probes is challenging. We have used resonant soft x-ray scattering to identify two-dimensional charge fluctuations with an incommensurate periodicity of ~3.2 lattice units in the copper-oxide planes of the superconductors (Y,Nd)Ba(2)Cu(3)O(6+)(x), with hole concentrations of 0.09 to 0.13 per planar Cu ion. The intensity and correlation length of the fluctuation signal increase strongly upon cooling down to the superconducting transition temperature (T(c)); further cooling below T(c) abruptly reverses the divergence of the charge correlations. In combination with earlier observations of a large gap in the spin excitation spectrum, these data indicate an incipient charge density wave instability that competes with superconductivity.
        Bookmark
        • Record: found
        • Abstract: not found
        • Article: not found

        Quantum oscillations and the Fermi surface in an underdoped high-Tc superconductor

          Bookmark
          • Record: found
          • Abstract: not found
          • Article: not found

          Direct observation of competition between superconductivity and charge density wave order in YBa2Cu3O6.67

            Bookmark

            Author and article information

            Journal
            29 March 2016
            1603.08897 10.1126/sciadv.1501657

            http://arxiv.org/licenses/nonexclusive-distrib/1.0/

            Custom metadata
            Science Advances 2, e1501657 (2016)
            11 pages includes supplementary information
            cond-mat.supr-con

            Condensed matter

            Comments

            Comment on this article