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Title: Superlight small bipolarons from realistic long-range Coulomb and Frohlich interactions
Authors: Alexandrov, A.S.
Samson, J.H.
Sica, G.
Issue Date: 2012
Publisher: © Americal Physical Society
Citation: ALEXANDROV, A.S., SAMSON, J.H. and SICA, G., 2012. Superlight small bipolarons from realistic long-range Coulomb and Frohlich interactions. Physical Review B, 85 (10), 104520 (4pp.).
Abstract: We report analytical and numerical results on the two-particle states of the polaronic t-Jp model derived recently with realistic Coulomb and electron-phonon (Fr¨ohlich) interactions in doped polar insulators. Eigenstates and eigenvalues are calculated for two different geometries. Our results show that the ground state is a bipolaronic singlet, made up of two polarons. The bipolaron size increases with increasing ratio of the polaron hopping integral t to the exchange interaction Jp but remains small in the whole range 0 t/Jp 1. Furthermore, the model exhibits a phase transition to a superconducting state with a critical temperature well in excess of 100K since the small bipolarons are perfectly mobile. In the range t/Jp 1, there are distinct charge and spin gaps opening in the density of states, specific heat, and magnetic susceptibility well above Tc.
Version: Published
DOI: 10.1103/PhysRevB.85.104520
URI: https://dspace.lboro.ac.uk/2134/11606
Publisher Link: http://dx.doi.org/10.1103/PhysRevB.85.104520
ISSN: 1098-0121
Appears in Collections:Published Articles (Physics)

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