Isotope effect in the translation-invariant bipolaron theory of high-temperature superconductivity

Abstract

It is shown that the translation-invariant bipolaron theory of superconductivity can explain the dependence of the isotope coefficient in high-temperature superconductors on the critical temperature of a superconducting transition: in the case of strong electron-phonon interaction, the isotope coefficient is low when doping is optimal and high when it is weak. It is demonstrated that in the case of London penetration depth, the absolute value of the isotope coefficient behaves in the opposite way. A conclusion of the great role of non-adiabaticity in the case of weak doping is made. The criteria for d-wave phonon input into the isotope effect is established.

arXiv comment8 pages, 1 figure. Enhanced and improved version, published in Condens. Matter

References in corpus (8)

• Direct observation of the oxygen isotope effect on the in-plane magnetic field penetration depth in optimally doped YBa${}_2$Cu${}_3$O${}_{7-\delta }$
• Admixtures to d-wave gap symmetry in untwinned YBa2Cu3O7 superconducting films measured by angle-resolved electron tunneling
• Isotope Effect in the Superfluid Density of HTS Cuprates: Stripes, Pseudogap and Impurities
• Isotope Effect for the Penetration Depth in Superconductors
• Superconducting properties of a nonideal bipolaron gas
• Translational-invariant bipolarons and superconductivity
• Superconducting properties of 3D low-density TI-bipolaron gas in magnetic field
• Translation Invariant Bipolarons and Charge Density Waves in High-Temperature Superconductors

Cited by in corpus (1)

• Pseudogap isotope effect as a probe of bipolaron mechanism in high temperature superconductors