Year: 2017
Type: article
Abstract: Phase transitions in isotropic quantum antiferromagnets are associated with the condensation of bosonic triplet excitations. In three-dimensional quantum antiferromagnets, such as ${\mathrm{TlCuCl}}_{3}$, condensation can be either pressure or magnetic field induced. The corresponding magnetic order obeys universal scaling with thermal critical exponent $\ensuremath{\phi}$. Employing a relativistic quantum field theory, the present work predicts the emergence of multiple (three) universalities under combined pressure and field tuning. Changes of universality are signaled by changes of the critical exponent $\ensuremath{\phi}$. Explicitly, we predict the existence of two new exponents $\ensuremath{\phi}=1$ and $1/2$ as well as recovering the known exponent $\ensuremath{\phi}=3/2$. We also predict logarithmic corrections to the power law scaling.
Authors: H. D. Scammell, O. P. Sushkov
Institution: UNSW Sydney
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funder: Australian Research Council
OpenAlex ID: W2574954420