Abstract
Magnetic properties of garnet single crystals Ho3Fe5−zSczO12 (z=0.3, 0.5, 0.7 and 0.9) are reported under high magnetic field up to 240 kOe in the 4.2–300 K temperature range. To interpret the influence of the diamagnetic Sc3+ substitution in octahedral Fe3+ sublattice, it is shown that the Néel–Dionne model has to be improved; from the analysis of the temperature dependences of the spontaneous magnetizations, it is concluded that the molecular field constant Ndc related to the Fe-Ho superexchange interactions has to be, as Ndd and Nad, a function of z. Furthermore from the M(H,T,z) variations, the “fictive” canting angle of the Dionne model is found to be strongly H, T, and z dependent with two different behaviors below and above the compensation temperatures. Finally in high magnetic field and at low temperatures, unusual field-induced transitions are observed for the higher substituted samples, whereas the onset of the usual canted magnetic phase takes place in higher applied field for all the crystals.
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