Translation-invariant bipolarons and the problem of high-temperature superconductivity

It is shown that the bipolaron ground state is described by a delocalized wave function. For a two-parameter wave function, the lowest variation estimate of the ground state energy in the strong coupling limit is found to be E=−0,414125α2. This is much lower than that derived with the use of the loc...

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Bibliographic Details
Published in:	Solid state communications Vol. 152; no. 7; pp. 621 - 623
Main Author:	Lakhno, V.D.
Format:	Journal Article
Language:	English
Published:	Elsevier Ltd 01-04-2012
Subjects:	A. Superconductors C. Delocalized bipolarons D. Froehlich Hamiltonian D. Lee, Low and Pines transformation C. Delocalized bipolarons D. Froehlich Hamiltonian D. Lee, Low and Pines transformation A. Superconductors
Online Access:	Get full text
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Summary:	It is shown that the bipolaron ground state is described by a delocalized wave function. For a two-parameter wave function, the lowest variation estimate of the ground state energy in the strong coupling limit is found to be E=−0,414125α2. This is much lower than that derived with the use of the localized bipolaron wave function. The results obtained testify to the possibility of a bipolaron mechanism of high-temperature superconductivity. ► The lowest variational estimate for bipolaron energy is obtained. ► The possibility of translation-invariant bipolaron mechanism is considered. ► The superconductivity without Bose condensation is suggested.
ISSN:	0038-1098 1879-2766
DOI:	10.1016/j.ssc.2012.01.013