Abstract
AbstractFrom room temperature down to temperatures near the Curie point (TC = 2.21 K) the ESR linewidths of GdCl3 ellipsoids narrow according to the simple law ΔH(T) = ΔH(∞) × [1 – (θ(0) – CNz)/T], where Nz denotes the demagnetization factor parallel to the applied static field. The result is explained by linearized modified Bloch equations, which describe the time development of the magnetization M(t) under the influence of a molecular field and of relaxation forces driving M(t) to a state of equilibrium determined by the instantaneous molecular field.
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