Anomalous High-Temperature EPR Linewidths in the Spinel Solid Solution Cu2xCr2xSn2−2xS4
| Autor: | P. Colombet, W. S. Glaunsinger |
|---|---|
| Rok vydání: | 1985 |
| Předmět: |
Chemistry
media_common.quotation_subject Spinel Frustration Spin structure engineering.material Atmospheric temperature range Condensed Matter Physics Electronic Optical and Magnetic Materials law.invention Ion Crystallography Nuclear magnetic resonance law engineering Antiferromagnetism Electron paramagnetic resonance media_common Solid solution |
| Zdroj: | physica status solidi (b). 128:141-149 |
| ISSN: | 1521-3951 0370-1972 |
| DOI: | 10.1002/pssb.2221280117 |
| Popis: | The spinel spin-glasses Cu2xCr2xSb2−2xS4 are studied by electron paramagnetic resonance in the temperature range 4 to 560 K. The linewidths at high temperatures are much larger than expected from magnetic measurements, and for 0.25 ≦ x ≦ 0.50 the linewidths are effectively dipolar although the lineshape is Lorentzian. The experimental and estimated exchange-narrowed line-widths at high temperatures are then compared for ferromagnetic-antiferromagnetic and predominantly antiferromagnetic insulating spin-glasses in which the magnetic ions occupy face-centered-cubic lattice sites or B-sites of the spinel structure. Les verres de spin structure spinelle Cu2xCr2xSn2−2xS4 ont ete etudies par resonance paramagnetique electronique de 4 a 560 K. Dans le domaine haute-temperature, les raies sont beaucoup plus larges que celles que l'on peut calculer en tenant compte de l'interaction d'echange. Pour 0,25 ≦ x ≦ 0,50, les raies ne sont pas retrecies par l'echange bien que leur forme soit Lorentzienne. Les verres de spin isolants a interactions dominantes antiferromagnetiques sont ensuite compares a leurs homologues a frustration de type ferromagnetique-antiferrcmagnetique pour des sous-reseaux magnetiques cubique faces centrees et sites B de la structure spinelle. |
| Databáze: | OpenAIRE |
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