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Magnetic and electrical transport properties of DyxGd5-xSi2Ge2 (x 0, 1.5, 2.5, 3.0, 3.5, 4.5 and 5.0) compounds,статья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
- Авторы: Nirmala R., Sankaranarayanan V., Sethupathi K., Morozkin A.V., Joshi A.G., Malik S.K.
- Журнал: Journal of Magnetism and Magnetic Materials
- Том: 309
- Год издания: 2007
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Первая страница: 212
- Последняя страница: 215
- DOI: 10.1016/j.jmmm.2006.07.002
- Аннотация: Effect of Dy substitution at the Gd-site on the magnetic and electrical transport properties of the giant magnetocaloric effect material, Gd5Si2Ge2, has been explored. At room temperature, DyxGd5xSi2Ge2 (xp3.5) compounds have the monoclinic Gd5Si2Ge2-type crystal structure (Space group P21/a), while those with x=3.5, have orthorhombic Sm5Ge4-type structure(Space group Pnma). The Dy substitution contracts the unit cell and also reduces the monoclinic distortion. The compound Gd5Si2Ge2 orders ferromagnetically at 276 K; with increasing Dy substitution, the magnetic transition temperature decreases (TN ¼ 56K for Dy5Si2Ge2) and the nature of magnetic coupling becomes antiferromagnetic in Dy-rich end. The electrical resistivity shows a marked drop near TC/TN. The thermoelectric power undergoes a slope change in the vicinity of magnetic transition and the signature of phonon and magnon drag effects is observed at low temperatures. Thus progressive Dy substitution in Gd5Si2Ge2 leads to a class of materials with interesting magnetic ground states, with magnetic ordering temperatures spanning from 56 to 276 K.
- Добавил в систему: Морозкин Александр Владимирович