Rise and Fall of Reentrant Phase Transitions in a Coupled Spin-Electron Model on a Doubly Decorated Honeycomb Lattice

• Authors: H. Čenčariková , J. Strečka
• Languages of publication: EN

Abstracts

EN

Phase diagrams and spontaneous magnetization are rigorously calculated for a coupled spin-electron model on a doubly decorated honeycomb lattice, which accounts for a quantum-mechanical hopping of the mobile electrons on decorating sites, the nearest-neighbor Ising coupling between mobile electrons and localized spins, as well as the further-neighbor Ising coupling between the localized spins placed on nodal sites. The spontaneously ordered ferromagnetic phase, spontaneously ordered antiferromagnetic phase and disordered paramagnetic phase emerge in a phase diagram depending on an electron filling of the decorating sites, a relative size of the hopping term and both considered coupling constants. It is evidenced that a nature and size of the further-neighbor Ising coupling between the localized spins basically influences rise and fall of reentrant transitions close to a phase boundary between the paramagnetic phase and both spontaneously ordered phases.

Keywords

EN

05.50.+q; 05.70.Fh; 71.27.+a; 75.30.Kz

Discipline

• 71.27.+a: Strongly correlated electron systems; heavy fermions
• 05.70.Fh: Phase transitions: general studies(see also 05.30.Rt Quantum phase transitions in quantum statistical mechanics; 64.70.Tg Quantum phase transitions in specific phase transitions; 73.43.Nq Quantum phase transitions in quantum Hall effects; for superconductivity phase diagrams, see 74.25.Dw; for magnetic phase boundaries, see 75.30.Kz; for ferroelectric phase transitions, see 77.80.B-)
• 05.50.+q: Lattice theory and statistics (Ising, Potts, etc.)(see also 64.60.Cn Order-disorder transformations, and 75.10.Hk Classical spin models)
• 75.30.Kz: Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)(for ferroelectric phase transitions, see 77.80.B-; for superconductivity phase diagrams, see 74.25.Dw)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2017
• Volume: 131
• Issue: 4
• Pages: 1021-1023

Dates

published

2017-04

Contributors

author

H. Čenčariková

• Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia

author

J. Strečka

• Institute of Physics, Faculty of Science, P.J. Šafárik University, Park Angelinum 9, 040 01 Košice, Slovakia

References

• [1] T. Narayanan, A. Kumar, Phys. Rep. 249, 135 (1994), doi: 10.1016/0370-1573(94)90015-9
• [2] F.F. Doria, M.S.S. Pereira, M.L. Lyra, J. Magn. Magn. Mater. 368, 98 (2014), doi: 10.1016/j.jmmm.2014.05.022
• [3] J. Strečka, H. Čenčariková, M.L. Lyra, Phys. Lett. A 379, 2915 (2015), doi: 10.1016/j.physleta.2015.08.027
• [4] H. Čenčariková, J. Strečka, M.L. Lyra, J. Magn. Magn. Mater. 401, 1106 (2016), doi: 10.1016/j.jmmm.2015.11.018

Identifiers

DOI

10.12693/APhysPolA.131.1021