Magnon excitations and the specific heat of EuxSr1- xS spin glasses in strong magnetic fieldsReport as inadecuate




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Abstract : The density of states of magnon-like excitations of EuxSr 1-xS spin glasses with x = 0.25, 0.44 and 0.54 is calculated for very strong magnetic fields B, i.e. B > 3 T. It is found that for these high fields the magnon-like excitations can be treated as non-interacting bosons up to temperatures far beyond the spin glass freezing temperature at B = 0. From the density of states the magnetic part CH of the specific heat is calculated, without any fit-parameter. The results agree quantitatively with recent experiments, for T between 0.3 K and 5 K 10 K in magnetic fields of 3.6 T 6.6 T.

Keywords : europium alloys magnons specific heat of solids spin glasses strontium alloys density of states magnon like excitations Eu sub x Sr sub 1 x S noninteracting bosons specific heat





Author: U. Krey

Source: https://hal.archives-ouvertes.fr/



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