Phase Separation in the Ground State of the Model 2D Spin-Pseudospin System

• Authors: A. Chikov , Yu. Panov , A. Moskvin , K. Budrin
• Languages of publication: EN

Abstracts

EN

We addressed a simplified static 2D spin-pseudospin model which takes into account both conventional Heisenberg spin exchange coupling and the on-site and inter-site charge correlations. Classical Monte-Carlo calculations for large square lattices show that homogeneous ground state solutions found in a mean-field approximation are unstable with respect to phase separation with the charge and spin subsystems behaving like immiscible quantum liquids. For instance, with lowering the temperature one can observe two sequential phase transitions: first, antiferromagnetic ordering in the spin subsystem diluted by randomly distributed charges, then, the charge condensation in the charge droplets. Thermodynamic properties and phase diagram of the 2D spin-pseudospin system are studied by Monte-Carlo simulation with a special attention given to the role played by the on-site correlation.

Keywords

EN

75.25.Dk; 74.81.-g

Discipline

• 74.81.-g: Inhomogeneous superconductors and superconducting systems, including electronic inhomogeneities
• 75.25.Dk: Orbital, charge, and other orders, including coupling of these orders

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2018
• Volume: 133
• Issue: 3
• Pages: 432-434

Dates

published

2018-03

Contributors

author

A. Chikov

• Ural Federal University, Institute of Natural Sciences, 620002, 19 Mira street, Ekaterinburg, Russia

author

Yu. Panov

• Ural Federal University, Institute of Natural Sciences, 620002, 19 Mira street, Ekaterinburg, Russia

author

A. Moskvin

• Ural Federal University, Institute of Natural Sciences, 620002, 19 Mira street, Ekaterinburg, Russia

author

K. Budrin

• Ural Federal University, Institute of Natural Sciences, 620002, 19 Mira street, Ekaterinburg, Russia

References

• [1] E. Fradkin, S.A. Kivelson, J.M. Tranquada, Rev. Mod. Phys. 87, 457 (2015), doi: 10.1103/RevModPhys.87.457
• [2] Yu.D. Panov, A.S. Moskvin, A.A. Chikov, I.L Avvakumov, J. Supercond. Nov. Magn. 29, 1077 (2016), doi: 10.1007/s10948-016-3378-5
• [3] Yu.D. Panov, A.S. Moskvin, A.A. Chikov, K.S. Budrin, J. Low Temp. Phys. 187, 646 (2017), doi: 10.1007/s10909-017-1743-9
• [4] A. Moskvin, Physical Review B 84, 075116 (2011), doi: 10.1103/PhysRevB.84.075116

Identifiers

DOI

10.12693/APhysPolA.133.432