Add time:07/31/2019         Source:sciencedirect.com

We study the ferromagnetic criticality of the pyrochlore (cas 12174-36-6) magnet Lu2V2O7 at the ferromagnetic transition TC≈70K from the isotherms of magnetization M(H) via an iteration process and the Kouv7el-Fisher method. The critical exponents associated with the transition are determined 7β= 0.32(1), γ= 1.41(1), and δ=5.38. The validity of these critical exponents is further verified by scaling all the M(H) data in the vicinity of TC onto two universal curves in the plot of M/|ε|β versus H/|ε|β+γ, where ε=T/TC-1. The obtained β and γ values show asymmetric behaviors on the TTC sides, and are consistent with the predicted values of 3D Ising and cubic universality classes, respectively. This makes Lu2V2O7 a rare example in which the critical behaviors associated with a ferromagnetic transition belong to different universality classes. We describe the observed criticality from the Ginzburg-Landau theory with the quartic cubic anisotropy that microscopically originates from the anti-symmetric Dzyaloshinskii-Moriya interaction as revealed by recent magnon thermal Hall effect and theoretical investigations.

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