Anisotropic k-ƒ interactions from spin-orbit coupled 5d intermediate states |
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Authors: | G Lacueva PM Levy G Creuzet A Fert JC Ousset |
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Institution: | Department of Physics, New York University, 4 Washington Place, New York, N.Y. 10003, U.S.A.;Laboratoire de Physique des Solides, Université de Paris-Sud 91405 Orsay, France;INSA, 31077, Toulouse, France |
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Abstract: | The anisotropy of the conduction electron-4? local moment interaction () gives rise to anisotropic transport effects. The contribution from the orbital character of the 4? moment has been well documented by magnetotransport studies on noble metals containing non-S state rare-earth ions. To determine whether there is an additional contribution to the anisotropy from the spin-orbit coupled 5d electron states we have studied the magnetoresistivity of Ag: Gd alloys. We have not found any significant anisotropy of the magnetoresistivity. By comparing this result and previous Hall effect and magnetoresistivity data on noble metal-rare earth alloys with our model calculation, we come to the conclusion that the spin-orbit splitting of the 5d virtual bound state is relatively small. We discuss the details of the resulting anisotropy of the interaction. |
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