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Magnetism of Rare-Earth Compounds with Non-Magnetic Crystal-Field Ground Levels |
| LIU Zhao-Sen |
| Department of Physics, Nanjing University of Information Science and Technology, Nanjing 210044 |
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| Cite this article: |
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LIU Zhao-Sen 2007 Chin. Phys. Lett. 24 207-209 |
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Abstract Among rare-earth compounds, there are many materials having non-magnetic crystal-field (CF) ground levels. To understand their magnetic behaviour at low temperatures, we study the effects of the CF levels and the Heisenberg-like coupling on the magnetic process of such a crystalline with mean-field and CF theory. It is found that the material can be magnetically ordered if the Heisenberg exchange is sufficiently strong. Additionally we obtain a condition for initial magnetic ordering, and derive a formula for estimating the Curie temperature if the ordering occurs.
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| Keywords:
75.10.Dg
75.10.-b
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Published: 01 January 2007
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| PACS: |
75.10.Dg
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(Crystal-field theory and spin Hamiltonians)
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75.10.-b
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(General theory and models of magnetic ordering)
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