The influence of further-neighbor spin-spin interaction on a ground state of 2D coupled spin-electron model in a magnetic field

An exhaustive ground-state analysis of extended two-dimensional (2D) correlated spin-electron model consisting of the Ising spins localized on nodal lattice sites and mobile electrons delocalized over pairs of decorating sites is performed within the framework of rigorous analytical calculations. Th...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2018-05, Vol.536, p.432-438
Main Authors: Čenčariková, Hana, Strečka, Jozef, Gendiar, Andrej, Tomašovičová, Natália
Format: Article
Language:English
Subjects:
Antiferromagnetism
Correlated electron systems
Correlation analysis
Coupling
Electron spin
Electrons
Ferromagnetism
Ising model
Ising spins
Kinetic energy
Kinetics
Lattice sites
Magnetic fields
Magnetic ordering
Mobile electrons
Phase transitions
Quantum dots
Two dimensional analysis
Two dimensional models
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Summary:An exhaustive ground-state analysis of extended two-dimensional (2D) correlated spin-electron model consisting of the Ising spins localized on nodal lattice sites and mobile electrons delocalized over pairs of decorating sites is performed within the framework of rigorous analytical calculations. The investigated model, defined on an arbitrary 2D doubly decorated lattice, takes into account the kinetic energy of mobile electrons, the nearest-neighbor Ising coupling between the localized spins and mobile electrons, the further-neighbor Ising coupling between the localized spins and the Zeeman energy. The ground-state phase diagrams are examined for a wide range of model parameters for both ferromagnetic as well as antiferromagnetic interaction between the nodal Ising spins and non-zero value of external magnetic field. It is found that non-zero values of further-neighbor interaction leads to a formation of new quantum states as a consequence of competition between all considered interaction terms. Moreover, the new quantum states are accompanied with different magnetic features and thus, several kinds of field-driven phase transitions are observed.
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2017.10.029