A mean-field theory for strongly disordered non-frustrated antiferromagnets
Research output: Contribution to journal › Research article › Contributed › peer-review
Contributors
Abstract
Motivated by impurity-induced magnetic ordering phenomena in spin-gap materials like TlCuCl3, we develop a mean-field theory for strongly disordered antiferromagnets, designed to capture the broad distribution of coupling constants in the effective model for the impurity degrees of freedom. Based on our results, we argue that in the presence of random magnetic couplings the conventional first-order spin-flop transition of an anisotropic antiferromagnet is split into two transitions at low temperatures, associated with separate order parameters along and perpendicular to the field axis. We demonstrate the existence of either a bicritcal point or a critical endpoint in the temperature-field phase diagram, with the consequence that signatures of the spin flop are more pronounced at elevated temperature.
Details
Original language | English |
---|---|
Pages (from-to) | 185-192 |
Number of pages | 8 |
Journal | European Physical Journal B |
Volume | 53 |
Issue number | 2 |
Publication status | Published - Sept 2006 |
Peer-reviewed | Yes |
Externally published | Yes |