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Competing magnetic interactions in the intermetallic compound Ho2 Mn3 Si5
Date Issued
27-04-2009
Author(s)
Indian Institute of Technology, Madras
Morozkin, A. V.
Lamsal, Jagat
Chu, Z.
Indian Institute of Technology, Madras
Indian Institute of Technology, Madras
Yamamoto, Y.
Hori, H.
Yelon, W. B.
Malik, S. K.
Abstract
The compound Ho2 Mn3 Si5 exhibits multiple magnetic transitions: (i) an ordering at ∼78 K, (ii) a second magnetic transition at ∼16 K, and (iii) an anomaly at ∼4 K. Its paramagnetic Curie temperature is found to be small but positive. Assuming a free ion effective paramagnetic moment of 10.6 μB for Ho3+ ion, the effective paramagnetic moment per Mn in this compound is calculated to be 1.73 μB, which indicates the itinerant nature of Mn d electrons. The various transitions in magnetization data are perhaps due to the ordering of rare earth and Mn moments. The magnetization at 2 K in applied fields of up to 7 T has linear field dependence, indicating dominant antiferromagnetic interactions in the system. Neutron diffraction studies point to a complex amplitude modulated incommensurate magnetic structure at 9 K. © 2009 American Institute of Physics.
Volume
105