Charging effects and quantum crossover in granular superconductors
E. Granato, M. A. Continentino
DOI 10.1103/PhysRevB.48.15977 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
The effects of the charging energy in the superconducting transition of granular materials or Josephson-junction arrays are investigated using a pseudo-spin-one model. Within a mean-field renormalization-group approach, we obtain the phase diagram as a function of temperature and charging energy. In contrast to earlier treatments, we find no sign of a reentrant transition in agreement with more recent studies. A crossover line is identified in the nonsuperconducting side of the phase diagram and along which we expect to observe anomalies in the transport and thermodynamic properties. We also study a charge ordering phase, which can appear for large nearest-neighbor Coulomb interaction, and show that it leads to first-order transitions at low temperatures. We argue that, in the presence of charge ordering, a nonmonotonic behavior with decreasing temperature is possible with a maximum in the resistance just before entering the superconducting phase.
Similar papers
Electric-field tuning of the superconductor-insulator transition in granular Al films
similarity 0.90Wenhao Wu & P. W. Adams
Source status unknown — claims are unverified
Fluctuation conductivity and microscopic granularity in Bi-based high-temperature superconductors
similarity 0.90A. R. Jurelo et al.
Source status unknown — claims are unverified
Rare-Region Onset of Superconductivity in Granular Systems
similarity 0.89Malcolm Durkin et al. · 2016 · arXiv:1607.06842
Source status unknown — claims are unverified
Approach to a superconductor-to-Bose-insulator transition in disordered films
similarity 0.88Myles A. Steiner et al.
Source status unknown — claims are unverified
Model for large arrays of Josephson junctions with unconventional superconductors
similarity 0.88D. V. Khveshchenko & R. Crooks
Source status unknown — claims are unverified
Origin of high-Tc superconductivity in doped Hubbard models and their extensions: Roles of uniform charge fluctuations
similarity 0.88Takahiro Misawa & Masatoshi Imada
Source status unknown — claims are unverified