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000052029 0247_ $$2DOI$$a10.1103/PhysRevLett.97.026404
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000052029 084__ $$2WoS$$aPhysics, Multidisciplinary
000052029 1001_ $$0P:(DE-Juel1)VDB37180$$aLezaic, M.$$b0$$uFZJ
000052029 245__ $$aThermal Collapse of Spin Polarization in Half-Metallic Ferromagnets
000052029 260__ $$aCollege Park, Md.$$bAPS$$c2006
000052029 300__ $$a
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000052029 440_0 $$04925$$aPhysical Review Letters$$v97$$x0031-9007$$y026404
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000052029 520__ $$aWe propose two novel approaches to study the temperature dependence of the magnetization and the spin polarization at the Fermi level in magnetic compounds, and apply them to half-metallic ferromagnets. We reveal a new mechanism, where the hybridization of states forming the half-metallic gap depends on thermal spin fluctuations and the polarization can drop abruptly at temperatures much lower than the Curie point. We verify this for NiMnSb by ab initio calculations. The thermal properties are studied by mapping ab initio results to an extended Heisenberg model which includes longitudinal fluctuations and is solved by a Monte Carlo method.
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000052029 7001_ $$0P:(DE-Juel1)130823$$aMavropoulos, Ph.$$b1$$uFZJ
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000052029 7001_ $$0P:(DE-Juel1)130545$$aBihlmayer, G.$$b3$$uFZJ
000052029 7001_ $$0P:(DE-Juel1)130548$$aBlügel, S.$$b4$$uFZJ
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000052029 8567_ $$uhttp://hdl.handle.net/2128/1442$$uhttp://dx.doi.org/10.1103/PhysRevLett.97.026404
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