Phase diagram of diluted Ising ferromagnet LiHoxY1−xF4

Babkevich, Peter; Nikseresht, N.; Kovacevic, I.; Piatek, Julian; Dalla Piazza, B.; Kraemer, Conradin; Krämer, Karl; Prokes, K.; Matas, S.; Jensen, Jens; Ronnow, Henrik M. (2016). Phase diagram of diluted Ising ferromagnet LiHoxY1−xF4. Physical review. B - condensed matter and materials physics, 94(17) American Physical Society 10.1103/PhysRevB.94.174443

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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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