phase diagram for spin-glasses: An experimental study of Ag:Mn
- 1 June 1982
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 25 (11), 6720-6729
- https://doi.org/10.1103/physrevb.25.6720
Abstract
We present high-resolution SQUID (superconducting quantum interference device) measurements of the dc magnetization on two Ag:Mn samples containing 2.6 and 4.0 at.% Mn. We have measured in detail the temperature dependence of the magnetization on warming through the glass temperature, , (i) after cooling to in a near-zero field and then applying the measurement field, zero-field cooled, and (ii) after cooling to in the measurement field. This has been done for fields Oe. The temperature derivative, , of the ZFC curve shows structure, allowing the identification of several characteristic temperatures associated with the paramagnetic to spin-glass transition in the presence of an external magnetic field. The temperature, , where the crossover from a Curie-like to a nonlinear susceptibility occurs, behaves as . Two further temperatures, and , where are suggested as possible candidates for the theoretical-field-dependent transition temperature given by where and is of order unity. We find , but where is approximately . However, the data are consistent with the theoretical prediction () using no adjustable parameters, but the range of data is insufficient to enable an unambiguous verification of the theory. On the basis of recent theories, we suggest that the system entering the spin-glass phase at should be marked experimentally by
Keywords
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