Magnetic order in palladium-based Heusler alloys part 3: The effects of disorder in Pd2MnIn1−xSn and Pd2MnIn1−ySb |
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| Authors: | P J Webster M R I Ramadan |
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| Institution: | Department of Pure and Applied Physics, University of Salford, Salford, M5 4WT, UK |
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| Abstract: | Magnetization, susceptibility, X-ray and neutron diffraction measurements have already been reported in parts 1 and 2 on the two alloy series Pd2MnIn1?xSnx and Pd2MnIn1?ySby when chemically ordered in the Heusler structure, with the Mn atoms on an fcc sublattice and carrying a moment of about 4.2μB ordered antiferromagnetically or ferromagnetically depending upon the conduction electron concentration. Results are presented here of similar measurements on the same samples, but after heat-treatments designed to produce maximum disorder between the Mn and In/Sn or In/Sb sites, respectively, whilst retaining the Pd order. In this disordered, B2, structure the Mn atoms retain the same magnetic moment but now occupy a simple cubic sublattice and form a new antiferromagnetic structure, simple cubic type 1. The results are discussed in terms of current indirect double resonance exchange interactions. |
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