Comment on `Experimental and Theoretical Constraints of Bipolaronic Superconductivity in High Tc Materials: An Impossibility'
Abstract
We show that objections raised by Chakraverty et al (Phys. Rev. Lett. 81, 433 (1998)) to the bipolaron model of superconducting cuprates are the result of an incorrect approximation for the bipolaron energy spectrum and misuse of the bipolaron theory. The consideration, which takes into account the multiband energy structure of bipolarons and the unscreened electron-phonon interaction clearly indicates that cuprates are in the Bose-Einstein condensation regime with mobile charged bosons.
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