An investigation of magnetic ordering in Gd<sub><i>x</i></sub>Ce<sub>1−<i>x</i></sub>Ru<sub>2</sub> by <sup>155</sup>Gd mössbauer spectroscopy
K. RuebenbauerInstitut of Nuclear Physics, CracowJ. FinkInstitut für Angewandte Kernphysik, Kernforschungszentrum KarlsruheHelmut SchmidtInstitut für Angewandte Kernphysik, Kernforschungszentrum KarlsruheG. CzjzekInstitut für Angewandte Kernphysik, Kernforschungszentrum KarlsruheK. TomalaGuest scentist at Institut für Angewandte Kernphysik, Kernforschungszentrum Karlsruhe
ABI
Аннотация
Abstract Hyperfine interactions at 155 Gd nuclei in alloys Gd x Ce 1− x Ru 2 with 0.05 ≦ x ≦ 0.5 are investigated by Mössbauer spectroscopy. For x ≧ 0.11 a linear variation of the magnetic ordering temperature T M with x is found. The temperature dependence of the magnetic hyperfine fields below T M indicates a gradual reduction of the extension of ferromagnetic correlations with decreasing Gd concentration. For dilute alloys (0.11 ≦ x ≦ 0.18), the temperature and field dependence of the hyperfine field is characterized by nearly critical behaviour over a large range of temperatures.
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