Search for Dimensionality Crossover of Spin-Glass Freezing in Superlattices of Cd0.50Mn0.50Te/CdTe
M. Sawicki, T. Dietl, G. Karczewski, T. Wojtowicz, J. Kossut and T. Skośkiewicz
Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warszawa, Poland
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SQUID measurements of the time decay of the thermoremanent magnetization (field-cooled in 1000 Oe) at long time scale, 102 < t < 105 s, are presented for MBE grown Cd0.50Mn0.50Te. We found that for both thin (32 Å) and thick (2500 Å) layers the spin-glass dynamics is characterized by a similar value of k = -(1/Tf)(dTf/dlogt) > 0.05, indicating the absence of the phase transition at nonzero temperature under the experimental conditions.
DOI: 10.12693/APhysPolA.90.919
PACS numbers: 75.50.-y, 75.50.Rr, 75.50.Lk