Titlebook: Heidelberg Colloquium on Spin Glasses; Proceedings of a Col J. L. Hemmen,I. Morgenstern Conference proceedings 1983 Springer-Verlag Berlin

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Experimental studies of the low-temperature properties of spin glasses, character is found to characterize the spin glass state at low T, whatever its remanence O , and can be modified at will in RKKY spin glasses by addition of non magnetic impurities. The irreversible properties of spin glasses might be explained by successive jumps in phase space over energy barrier

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,The ferro- and ferrimagnetic — spin glass transition as studied by Mössbauer spectroscopy,ferri magnetic (last) to a spin-glass-like state can be determined by Mössbauer spectros copy. Spectra taken in external magnetic field show that strong spin canting starts at this transition, while in zero external field the transition is accompanied by an anomalous increase in the saturation avera

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A study of short-range spin glasses,e phase, in particular the stability and consistency of mean field theory and identify the most divergent fluctuations and the resulting special dimensionalities of the model. The dynamic critical behaviour is studied within an e expansion around the upper critical dimension d.=6.