Vibronic pairing mechanism for La,2-xSrxCuO4. The role of local structural distortions

Borissov, M.; Georgiev, M.

doi:10.1080/13642818908205908

Cited by 6 publications

(1 citation statement)

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“…Vibronic polarons form following electron self‐trapping and subsequent relaxation to an off‐center state. The two‐band electron–phonon Hamiltonian in site representation is extended so as to incorporate pairing interactions and terms higher‐order in the electron‐mode coupling 16–18. Here, i , j , l are site labels, μ, μ′, μ″; ν, ν′, ν″ = g , u are band labels, a

_{†}^{italicig}

( a ig ) creates (annihilates) a g ‐band electron at site i , while a

_{†}^{italiclu}

( a lu ) does so for a u ‐band electron at site I .…”

Section: Vibronic Polaronsmentioning

confidence: 99%

Vibronic polarons: Self‐trapping, local rotation, and band features

Andreev

Ivanovich

Georgiev

2002

Int J of Quantum Chemistry

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ABSTRACT:We revisit basic theoretical concepts of local and itinerant vibronic polarons in crystals. The following results may be regarded as novel: (1) The electron self-trapping rate to a small polaron is calculated via the reaction rate method; subsequently, self-trapped on-center small polarons relax to an off-center vibronic polaron state. (2) The general vibronic Hamiltonian is redefined so as to incorporate both local and itinerant behavior and pairing into bipolarons or Cooper pairs. (3) The planar rotation and diametral tunneling of an off-center polaron around and across its centrosymmetrical site are dealt with to adiabatic approximation. (4) Variational calculations are made for vibronic polarons itinerant along 1-D chains by means of a two-band extension of Merrifield's ansatz. This investigation of vibronic polarons is undertaken in view of their presumed role in high-temperature superconductivity and colossal magnetoresistance.

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