Magnetic properties of Er1-xDyxAl2(0 <= x <= 1) compounds in low applied fields

TitleMagnetic properties of Er1-xDyxAl2(0 <= x <= 1) compounds in low applied fields
Publication TypeJournal Article
Year of Publication2010
AuthorsNirmala R, Paudyal D, Pecharsky VK, Gschneidner KA
Journal TitleJournal of Applied Physics
Volume107
Pages09a723
Date Published05/01
ISBN Number0021-8979
Accession NumberISI:000277834300082
Abstract

Low field magnetic properties of the Laves phase RAl2 compounds (where R is a mixture of Er and Dy, i.e., Er1-xDyx and x=0, 0.1, 0.14, 0.18, 0.25, 0.33, 0.5, and 1) have been studied. These compounds order ferromagnetically, and the middle members show both metastability in a narrow temperature window within the ferromagnetically ordered state and signatures of first order transitions in low applied fields. Results of first principles electronic structure calculations on Er0.75Dy0.25Al2 indicate a significant difference in the spin polarization in the 5d states of Er3+ and Dy3+ moments. In addition, anisotropic exchange and crystalline electric field effects arise from the random distribution of rare earth ions in the lattice. These and quadrupolar effects triggered by aspherical charge distributions of Er3+ and Dy3+ ions may compete and lead to the low temperature anomalies observed in low field magnetization data. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3339778]

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