Quantum Physics Division
Faculty of PhysicsAdam Mickiewicz University

Electron-electron interaction effects in magnetic layered structures

V. K. Dugaev1 , J. Barnaś2,3

1 Chernovtsy Department of the Institute of Materials Science Problems Vilde 5, 58001 Chernovtsy, Ukraine
2 Department of Physics, A. Mickiewicz University, ul. Umultowska 85, 61-614 Poznań, Poland
3 Institute of Molecular Physics, Polish Academy of Sciences, ul. M. Smoluchowskiego 17, 60-179 Poznań, Poland

Europhysics Letters, 54, 105-111 (2001)
DOI: 10.1209/epl/i2001-00235-7


We consider some peculiarities of the logarithmic electron-electron interaction corrections to conductivity, which can arise in magnetic quantum wells due to spin-splitting of energy levels. The matrix elements of Coulomb interaction include different screening contributions from spin-up and spin-down electrons, which can lead to anomalous behavior of the interaction constant when the width of a spin quantum well is changed. Our results explain qualitatively the physical origin of the recently observed anomalous behavior of the logarithmic term in electrical resistivity of Co/Cr/Ag/Co layered structures (Aliev F. G. et al., Phys. Rev. Lett., 78 (1997) 134).


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