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Critical exponents of amorphous Gd0.70Pd0.30

Physical Review B, ISSN: 0163-1829, Vol: 31, Issue: 1, Page: 287-292
1985
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The magnetization of liquid-quenched amorphous Gd0.70Pd0.30 was measured between temperatures of 77 and 300 K in fields up to 6 kOe. The ferromagnetic Curie temperature TC and the critical exponents and were found to be 131.77 0.20 K, 0.34 0.02, 1.010 0.003, and 3.95 0.10, respectively. These experimentally determined values of the critical exponents very clearly satisfy the scaling law =(-1). Of special interest is the value of unity for in the neighborhood of the ferromagnetic Curie temperature, the usual Curie-Weiss plot of inverse susceptibility yielding a paramagnetic Curie temperature of 155.20 0.20 K. EPR measurements made over the temperature range of 135 to 100 K reveal an almost-free Gd3+-ion response broadened and made asymmetric by conduction-electron effects, while at the same time exhibiting no significant directional dependence on the applied field. This result and the lack of hysteresis at 77 K support the idea that liquid-quenched Gd0.70Pd0.30 becomes an isotropic amorphous ferromagnet at TC. Finally, examination of sections of a given sample (produced via the hammer-and-anvil technique) reveal that, even at the highest cooling rates (107 K s-1), entirely amorphous material may be produced only toward the sample edges, in agreement with current models of amorphous cooling in liquid-quenched samples. © 1985 The American Physical Society.

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