Magnetic transitions and scaling behavior in Gd-rich glasses

Authors

M.J. O'Shea, Cardwell Hall, Department of Physics, Kansas State University, Manhattan, Kansas Follow
David J. Sellmyer, University of Nebraska-LincolnFollow

Date of this Version

December 1985

Comments

Published by American Physical Society. Phys. Rev. B 32, 7502 (1985). http://prb.aps.org. Copyright © 1985 American Physical Society. Permission to use.

Abstract

The magnetic properties of amorphous alloys with composition Gd_xLa_72-xGa₁₈B₁₀ have been investigated using ac-susceptibilty and dc-magnetization techniques in the temperature range 4.2–300 K. This system shows double-transition behavior for x≳67 and paramagnetic–spin-glass transition behavior for x<67. Time-dependent magnetization effects are present in the spin-glass phase and these effects vanish in finite fields, in qualitative agreement with mean-field theory. The magnetic isotherms around both the paramagnetic-ferromagnetic and ferromagnetic–spin-glass transitions scale according to the scaling hypothesis, and these results are discussed in some detail. A magnetic phase diagram for this system is obtained from the transition temperatures determined from scaling.