Ferromagnetic polarons in a one-dimensional t - J model with next-nearest-neighbor hopping
- J. Stefan Institute, University of Ljubljana, 61111 Ljubljana (Yugoslavia)
In a {ital t}-{ital J} model on a chain, an additional next-nearest-neighbor hopping term destroys the complete spin-charge separation at {ital J}/{ital t}{much lt}1 and induces the formation of stable spin-polarized {ital S}{gt}0 states. The properties of a single ferromagnetic polaron are investigated by the exact diagonalization of small systems and by the approximative treatment of an effective model, describing a spinless fermion coupled to the spin background. Both methods give consistent results on the critical {ital J}{sub {ital c}} for the polaron formation on the increase of the spin {ital S} and the polaron size with decreasing {ital J}. A very large enhancement of the polaron mass with increasing {ital S} is observed. Systems with a finite concentration of holes are also studied within the same framework. Analytical considerations indicate on the bound many-hole states and consequently on phase-separated regions in the phase diagram.
- OSTI ID:
- 5132119
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Vol. 44:21; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
HIGH-TC SUPERCONDUCTORS
FERROMAGNETISM
COPPER OXIDES
POLARONS
CHALCOGENIDES
COPPER COMPOUNDS
MAGNETISM
OXIDES
OXYGEN COMPOUNDS
QUASI PARTICLES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
665411* - Basic Superconductivity Studies- (1992-)