Ferromagnetic polarons in a one-dimensional t - J model with next-nearest-neighbor hopping

Journal Article · Sun Dec 01 04:00:00 EST 1991 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.44.11795· OSTI ID:5132119

Prelovsek, P; Ramsak, A; Sega, I ^[1]

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1. 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), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 44:21; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

665411* -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
FERROMAGNETISM
HIGH-TC SUPERCONDUCTORS
MAGNETISM
OXIDES
OXYGEN COMPOUNDS
POLARONS
QUASI PARTICLES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS