Volume 76, Number 3, November 2006
|Page(s)||471 - 476|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||07 October 2006|
Large magnetoresistance in intermetallic compounds ( = , and )
Tata Institute of Fundamental Research - Mumbai 400 005 India
2 Department of Chemistry, Moscow State University Moscow, GSP-2, 119992, Russia
3 School of Materials Science, Japan Advanced Institute of Science and Technology - Ishikawa 923-1292, Japan
Corresponding author: firstname.lastname@example.org
Accepted: 12 September 2006
Magnetization (M) and magnetoresistance (MR) measurements on polycrystalline ( = , and ) compounds (tetragonal, space group ) have been carried out in the temperature range of 2–300, in various applied fields. Both, the rare earth and Mn, are found to carry magnetic moments in these compounds. Mn has two sub-lattices (Mn1 and Mn2) that order magnetically at two different temperatures. Rare-earth and Mn1 moments order ferromagnetically at whereas Mn2 is found to magnetically order at (, 86, 78 and , 34, 16 for R = Tb, Dy and Ho compounds, respectively). Magnetoresistance measurements reveal large negative MR values of about 50% near at 9 in all these compounds. This giant magnetoresistance is attributed to the spin-dependent scattering effects, competing exchange interactions and the layered structure of these compounds.
PACS: 71.20.Eh – Rare earth metals and alloys / 72.15.-v – Electronic conduction in metals and alloys / 75.47.-m – Magnetotransport phenomena; materials for magnetotransport
© EDP Sciences, 2006
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