NEW METAL/SUPERCONDUCTOR-INSULATOR TRANSITIONS AND THEIR EFFECTS ON HIGH-TC SUPERCONDUCTIVITY IN UNDERDOPED AND OPTIMALLY DOPED CUPRATES
DOI:
https://doi.org/10.31489/2024No1/21-27Keywords:
polaron formation and charge density waves, metal/superconductor-insulator transition, cuprates, Bose-liquid superconductivity, different disorders, suppression and enhancement of high-T superconductivityAbstract
A new approach to the metal/superconductor-insulator transition in doped cuprates by studying the polaron formation and localization of doped charge carriers (holes) in them and the possibility of transforming a metallic or superconducting system into an insulator was developed. A more suitable criterion for such a phase transition by comparing the bandwidth (or Fermi energy) of large polarons with their binding energies in the cuprates was derived. The possibility of the metal/superconductor-insulator transition and phase separation in doped cuprates resulting in the formation of competing metallic/superconducting and insulating phases in underdoped, optimally doped and even in overdoped high-Tc cuprates was predicted. Then the possible detrimental and beneficial effects of the different disorders (e.g. polaron formation and charge-density-wave transition) and the coexisting insulating and superconducting phases on the critical temperature of the superconducting transition of underdoped and optimally doped cuprates was examined. The actual superconducting transition temperature in these materials using the theory of Bose-liquid superconductivity, and not the Bardeen-Cooper-Schrieffer-like theory of Fermi-liquid superconductivity, which is incapable of predicting the relevant value of in high- cuprates was determined. We find that the suppressing of the polaronic and charge-density-wave effects in optimally doped cuprates results in the enhancement of , while some lattice defects (e.g., anion vacancies) in the cuprates may strongly affect, on and enhance high- superconductivity in them.
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