Phase diagrams of a model diluted fcc magnet with arbitrary spin and modified RKKY interaction: Influence of external magnetic field and structural short-range order

Karol Szałowski and Tadeusz Balcerzak
Phys. Rev. B 77, 115204 – Published 11 March 2008

Abstract

A diluted fcc magnet with modified long-range Ruderman–Kittel–Kasuya–Yosida interaction and arbitrary Ising spin S is considered within a two-sublattice model. The exponential damping for the long-range interaction as well as the nearest-neighbor antiferromagnetic superexchange couplings are taken into account. In the molecular field approximation, the Gibbs free energy is derived, from which all magnetic thermodynamic properties can be self-consistently obtained. In particular, the phase diagrams are studied for different magnetic ion and free charge carrier concentrations, taking into account the atomic short-range-order (Warren–Cowley) parameter and the external magnetic field. The stability regions of paramagnetic, ferromagnetic, and three characteristic antiferromagnetic phases are discussed. Moreover, the critical temperature and degree of magnetic frustration are evaluated to be dependent on the short-range order.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
2 More
  • Received 10 December 2007

DOI:https://doi.org/10.1103/PhysRevB.77.115204

©2008 American Physical Society

Authors & Affiliations

Karol Szałowski* and Tadeusz Balcerzak

  • Department of Solid State Physics, University of Łódź, ulica Pomorska 149/153, 90-236 Łódź, Poland

  • *kszalowski@uni.lodz.pl

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 77, Iss. 11 — 15 March 2008

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×