Unusual Magnetic Phase Transitions in Gd Clusters in Multicomponent Oxide Glasses
Magnetic susceptibility, EPR and optical properties have been studied in a glass system {20La2O3-22Al2O3-23B2O3-35(SiO2+GeO2)} with a part of La2O3 substituted by Gd2O3 in different concentrations. Positive Weiss constants have been found in more heavily doped glasses; two magnetic transitions at 55...
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Published in | Journal of superconductivity and novel magnetism Vol. 20; no. 2; pp. 149 - 153 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
01.02.2007
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Online Access | Get full text |
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Summary: | Magnetic susceptibility, EPR and optical properties have been studied in a glass system {20La2O3-22Al2O3-23B2O3-35(SiO2+GeO2)} with a part of La2O3 substituted by Gd2O3 in different concentrations. Positive Weiss constants have been found in more heavily doped glasses; two magnetic transitions at 55 and 12 K have been detected and ascribed, respectively, to ferromagnetic and antiferromagnetic clusters of Gd ions. The EPR spectra confirm the clustering at higher Gd contents. At low temperatures the cluster-related resonance indicates an onset of magnetic anisotropy. The clustering, depending on the Gd concentration, correlates with a shift to lower energies of the strong optical absorption band edge. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 1557-1939 |
DOI: | 10.1007/s10948-006-0116-4 |