On the propensity of magnetism in 3d transition-metal-MgCNi3 alloys
DSpace at IIT Bombay
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Title |
On the propensity of magnetism in 3d transition-metal-MgCNi3 alloys
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Creator |
JIJI THOMAS JOSEPH, P
SINGH, PRABHAKAR P |
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Subject |
magnetic moment
approximation theory ferromagnetism paramagnetism |
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Description |
The effects of disorder and incipient magnetism in MgC(Ni1-xTx)3 (T≡Fe, Co or Cu) alloys are studied using coherent-potential approximation and Ginzburg–Landau coefficients. The first-principles, local-density-functional-based calculations for substitutionally disordered Fe and Co impurities in the Ni sub-lattice of MgCNi3, in low concentrations, show that incipient magnetism resides in these materials. The overestimation of the calculated magnetic properties points to the limitations of the local-density approximation. However, using a phenomenological approach based on Ginzburg–Landau coefficients and the fixed-spin moment method, we show that MgC(Ni1-xTx)3 alloys remain paramagnetic. At expanded volumes, we also find the possibility of a ferromagnetic state for MgC(Ni0.95Fe0.05)3 and MgC(Ni0.90Co0.10)3 alloys.
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Publisher |
Elsevier
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Date |
2009-04-03T09:03:04Z
2011-11-25T20:31:30Z 2011-12-26T13:08:11Z 2011-12-27T05:56:12Z 2009-04-03T09:03:04Z 2011-11-25T20:31:30Z 2011-12-26T13:08:11Z 2011-12-27T05:56:12Z 2007 |
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Type |
Article
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Identifier |
Journal of Magnetism and Magnetic Materials 309(1), 144-148
0304-8853 http://dx.doi.org/10.1016/j.jmmm.2006.06.024 http://hdl.handle.net/10054/1110 http://dspace.library.iitb.ac.in/xmlui/handle/10054/1110 |
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Language |
en
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