Experimental evidence for a new magnetic structure between incommensurate and commensurate phases in antiferromagnetic Cr-Al dilute alloys
J B Sousa; M M Amado; R P Pinto; M F Pinheiro; M E Braga; J M Moreira; L E Hedman; H U Astrom; L Khlaif; P Walker; G Garton; D Hukin; J B Sousa; Centro de Fisica, Univ. do Porto, Porto, Portugal; M M Amado; Centro de Fisica, Univ. do Porto, Porto, Portugal; R P Pinto; Centro de Fisica, Univ. do Porto, Porto, Portugal; M F Pinheiro; Centro de Fisica, Univ. do Porto, Porto, Portugal; M E Braga; Centro de Fisica, Univ. do Porto, Porto, Portugal; J M Moreira; Centro de Fisica, Univ. do Porto, Porto, Portugal; L E Hedman; Centro de Fisica, Univ. do Porto, Porto, Portugal; H U Astrom; Centro de Fisica, Univ. do Porto, Porto, Portugal; L Khlaif; Centro de Fisica, Univ. do Porto, Porto, Portugal; P Walker; Centro de Fisica, Univ. do Porto, Porto, Portugal; G Garton; Centro de Fisica, Univ. do Porto, Porto, Portugal; D Hukin; Centro de Fisica, Univ. do Porto, Porto, Portugal
Журнал:
Journal of Physics F: Metal Physics
Дата:
1980-11-01
Аннотация:
High-accuracy measurements of the temperature derivative of the electrical resistivity (d rho /dT) and magnetic susceptibility ( chi ) are used to study the complex antiferromagnetic behaviour of dilute Cr-Al alloys (c<or approximately=7 at.%Al). Striking anomalies appear in both properties at intermediate compositions (1.1<or approximately=c<or approximately=3 at.%Al), suggesting the onset of a new inhomogeneous structure with some form of localised magnetic moments. Possible implications of recent models on point-defect-induced magnetism are examined. The authors' results provide very detailed information on the complex dependence of the Neel temperature on Al content (T<sub>N</sub>(c)). They also explain the reason for the apparently strong discrepancies among T<sub>N</sub> values quoted in the literature for samples with intermediate Al concentrations.
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