The interplay of strong local electron-lattice and electron-electron interaction is analyzed in the two-dimensional Hubbard-Holstein model using an effective single band Hamiltonian. The effect of the strain field acting on the CuO2 plane and the local cooperative pseudo Jahn Teller vibronic electron-lattice coupling appropriate to cuprate superconductors at optimum doping ji.e.; at doping larger than 1/8) are included via the effective next near neighbor electronic hopping integral t ' (determined by the strain field) close to the local vibronic frequency omega (o) (involved in the pseudo Jahn Teller electron lattice coupling). The system shows a characteristic feature of the physics of complex systems, the competition and fluctuation between two states: 1) a first phase of charges self trapped in domains with local lattice distortions (a generalisation to a many polaron system of the idea of single intermediate polaron) and 2) a second phase of free carriers.

Coexistence of charges trapped in local lattice distortions and free carriers in cuprates / V., Cataudella; G., DE FILIPPIS; G., Iadonisi; Bianconi, Antonio; Saini, Naurang Lal. - In: INTERNATIONAL JOURNAL OF MODERN PHYSICS B. - ISSN 0217-9792. - STAMPA. - 14:(2000), pp. 3398-3405. [10.1142/S0217979200003605]

Coexistence of charges trapped in local lattice distortions and free carriers in cuprates

BIANCONI, Antonio;SAINI, Naurang Lal
2000

Abstract

The interplay of strong local electron-lattice and electron-electron interaction is analyzed in the two-dimensional Hubbard-Holstein model using an effective single band Hamiltonian. The effect of the strain field acting on the CuO2 plane and the local cooperative pseudo Jahn Teller vibronic electron-lattice coupling appropriate to cuprate superconductors at optimum doping ji.e.; at doping larger than 1/8) are included via the effective next near neighbor electronic hopping integral t ' (determined by the strain field) close to the local vibronic frequency omega (o) (involved in the pseudo Jahn Teller electron lattice coupling). The system shows a characteristic feature of the physics of complex systems, the competition and fluctuation between two states: 1) a first phase of charges self trapped in domains with local lattice distortions (a generalisation to a many polaron system of the idea of single intermediate polaron) and 2) a second phase of free carriers.
2000
01 Pubblicazione su rivista::01a Articolo in rivista
Coexistence of charges trapped in local lattice distortions and free carriers in cuprates / V., Cataudella; G., DE FILIPPIS; G., Iadonisi; Bianconi, Antonio; Saini, Naurang Lal. - In: INTERNATIONAL JOURNAL OF MODERN PHYSICS B. - ISSN 0217-9792. - STAMPA. - 14:(2000), pp. 3398-3405. [10.1142/S0217979200003605]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/251110
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