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The connection between our results and the well known ac susceptibility cusp measurements(15) is easy to state if not easy to use: In a typical ac susceptibility experiment what is detected is that part of the magnetisation able to respond to a small ac field(in presence of a fixed static field generally parallel to the ac field). Above Tg a complete response, i.e.Curie law like, is found as expected whereas below Tg only a fraction of the magnetisation rapidly decreasing with T follows the driving field thus producing a sharp cusp a Xac at Tg. It is noteworthy that the high temperature part of the susceptibility cusp should be identical with static magnetisation measurements (in low fields) whereas the.low temperature part of it depend on off equilibrium metastable properties of the spin glass system, hence cannot be compared with the field cooled equilibrium magnetisation.
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The presence of a Curie Weiss temperature indicating a positive Jo will alter only the first term of these expressions.See ref.4 for the complete expressions.
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Monod, P., Bouchiat, H. (1981). Equilibrium magnetisation of a spin glass above and below Tg: Comparison with mean field theory. In: Castellani, C., Di Castro, C., Peliti, L. (eds) Disordered Systems and Localization. Lecture Notes in Physics, vol 149. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0012549
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DOI: https://doi.org/10.1007/BFb0012549
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