Enhanced Magnetocaloric Effect due to Selective Dilution in a Triangular Ising Antiferromagnet

• Authors: M. Borovský , M. Žukovič
• Languages of publication: EN

Abstracts

EN

We employ an effective-field theory with correlations in order to study a magnetocaloric effect on a triangular Ising antiferromagnet, which is selectively diluted by non-magnetic impurities on one of the three sublattices. Such a dilution generally relieves massive degeneracy in our system and therefore the ground-state entropy diminishes and the magnetocaloric effect weakens at low temperatures. However, at relatively higher temperatures we can observe significantly enhanced negative isothermal entropy changes for the sublattice concentration p_A=0.8.

Keywords

EN

05.50.+q; 75.50.Ee; 75.30.Sg; 05.10.Ln

Discipline

• 75.50.Ee: Antiferromagnetics
• 75.30.Sg: Magnetocaloric effect, magnetic cooling(for cryogenics, see 07.20.Mc)
• 05.10.Ln: Monte Carlo methods(see also 02.70.Tt, Uu in mathematical methods in physics; for Monte Carlo methods extensively used in subdivisions of physics, see the appropriate section; for example, see 52.65.Pp in plasma simulation)
• 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)

• Journal: Acta Physica Polonica A
• Year: 2017
• Volume: 131
• Issue: 4
• Pages: 645-647

Dates

published

2017-04

Contributors

author

M. Borovský

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

author

M. Žukovič

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

References

• [1] G.H. Wannier, Phys. Rev. 79, 357 (1950), doi: 10.1103/PhysRev.79.357
• [2] M. Borovský, M. Žukovič, A. Bobák, Physica A 392, 157 (2013), doi: 10.1016/j.physa.2012.08.016
• [3] M.E. Zhitomirsky, Phys. Rev. B 67, 104421 (2003), doi: 10.1103/PhysRevB.67.104421
• [4] T. Kaneyoshi, Acta Phys. Pol. A 83, 703 (1993), doi: 10.12693/APhysPolA.83.703

Identifiers

DOI

10.12693/APhysPolA.131.645