The compound Ho2Mn3Si5 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 10.6µB for Ho3+ ion, the effective paramagnetic moment per Mn in this compound is calculated to be 1.73µB, 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.
R. Nirmala and A. V. Morozkin and J. Lamsal and Z. Chu and V. Sankaranarayanan and K. Sethupathi and Y. Yamamoto and H. Hori and W. B. Yelon and S. K. Malik, "Competing Magnetic Interactions in the Intermetallic Compound Ho₂Mn₃Si₅," Journal of Applied Physics, American Institute of Physics (AIP), Mar 2009.
The definitive version is available at http://dx.doi.org/10.1063/1.3072772
Keywords and Phrases
Curie Temperature; Antiferromagetic Materials; Exchange Interactions (Electron); Holmium Alloys; Magnetic Moments; Magnetic Structure; Magnetisation; Manganese Alloys; Neutron Diffraction; Paramagnetic Materials; Silicon Alloys
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