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- W3104014957 abstract "Prior to the onset of the ferromagnetic transition in semimetallic EuB_6, unusual magnetic and electric behavior have been reported. Using a highly sensitive magneto-optical imaging (MOI) technique, we visualize the behavior of magnetic domains in a EuB_6 single crystal.The transformation from a paramagnetic to a ferromagnetic state is shown to be non-Curie Weiss like and proceeds via multiple breaks in the curvature of the temperature-dependent local magnetization. From our experiments, we identify three characteristic boundaries, T^*(H),T^*_c1(H) and T_c2(H),in a field - temperature magnetic phase diagram.Using scaling and Modified Arrott plot analysis of isothermal bulk magnetization data, we determine the critical exponents $beta$ = 0.22 $pm$ 0.01, $gamma$ = 0.88 $pm$ 0.05 and $delta$= 5.0 $pm$ 0.1 and a critical transition temperature = 12.0 $pm$ 0.2 K which is found to be equal to T_c2. The critical exponents are close to those associated with the universality class of tricritical mean field model. The absence of a model with which the exponents correspond with directly, suggests the presence of large critical fluctuations in this system. The critical fluctuations in this system are sensitive to the applied magnetic field, which leads to field dependence of boundaries in the magnetic phase diagram. With increasing T the magnetic domains disintegrate into finger-like patterns before fragmenting into disjoint magnetized puddles at T^*_c1 and ultimately disappearing at T*. At T^*_c1 we observe a significant increase in the spatial inhomogeneity of the local magnetic field distribution associated with the magnetic domain structure disintegrating into smaller magnetized structures. We explain our results via the formation of magnetic polaronic clusters and their coalescing into larger domains." @default.
- W3104014957 created "2020-11-23" @default.
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- W3104014957 date "2018-11-27" @default.
- W3104014957 modified "2023-10-10" @default.
- W3104014957 title "Magneto-optical imaging of stepwise magnetic domain disintegration at characteristic temperatures in EuB6" @default.
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- W3104014957 doi "https://doi.org/10.1103/physrevmaterials.2.113404" @default.
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