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Phase diagram of diluted Ising ferromagnet LiHoxY1-xF4

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Babkevich P., Nikseresht N., Kovacevic I., Piatek J.O., Dalla Piazza B., Kraemer C., Krämer K.W., Prokes K., Mataš S., Jensen J., Rønnow H.M.,
Project Dimensional and Anisotropy Control of Model Quantum Magnets
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Original article (peer-reviewed)

Journal Phys. Rev. B
Volume (Issue) 94
Page(s) 174443 - 8
Title of proceedings Phys. Rev. B
DOI 10.1103/physrevb.94.174443

Open Access

URL https://arxiv.org/abs/1611.09777
Type of Open Access Repository (Green Open Access)

Abstract

We present a systematic study of the phase diagram of LiHoxY1−xF4 (0.25 x 1) Ising ferromagnets obtained from neutron scattering measurements and mean-field calculations. We show that while the thermal phase transition decreases linearly with dilution, as predicted by mean-field theory, the critical transverse field at the quantum critical point is suppressed much faster. This behavior is related to competition between off-diagonal dipolar coupling and quantum fluctuations that are tuned by doping and applied field, respectively. In this paper, we quantify the deviation of the experimental results from mean-field predictions, with the aim that this analysis can be used in future theoretical efforts towards a quantitative description.
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