Magnetic behavior of stoichiometric and nonstoichiometric GdAs single crystals

Abstract
The magnetizations, magnetic susceptibilities, and specific heats of both stoichiometric and nonstoichiometric single crystals GdAs are measured at temperatures 1.7≤T≤300 K and magnetic fields 0≤H≤24 T. A systematic comparison between the magnetic behavior of the stoichiometric and nonstoichiometric samples is carried out. The stoichiometric sample shows the magnetic features expected for a Heisenberg antiferromagnet. For the nonstoichiometric sample, some anomalous magnetic properties are observed and explained by the trapped magnetic polaron model. © 1996 The American Physical Society.

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