New low frequency ac susceptibility measurements on two different spin glasses show that cooling/heating the sample at a constant rate yields an essentially reversible (but rate dependent) χ(T) curve; a downward relaxation of χ occurs during a temporary stop at constant temperature (aging). Two main features of our results are (i) when cooling is resumed after such a stop, χ goes back to the reversible curve (chaos), and (ii) upon reheating, χ perfectly traces the previous aging history (memory). We discuss implications of our results for a real space (as opposed to phase space) picture of spin glasses.
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Jonason et al. (1998) studied this question.
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