CPA density of states and conductivity in a double-exchange system containing impurities |
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| Authors: | M Auslender E Kogan |
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| Institution: | (1) Department of Electrical and Computer Engineering, Ben-Gurion University of the Negev POB 653, Beer-Sheva 84105, Israel, IL;(2) Jack and Pearl Resnick Institute of Advanced Technology, Department of Physics, Bar-Ilan University, Ramat-Gan 52900, Israel, IL |
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| Abstract: | We study density of states and conductivity of the doped double-exchange system, treating interaction of charge carriers both
with the localized spins and with the impurities in the coherent potential approximation. It is shown that under appropriate
conditions there is a gap between the conduction band and the impurity band in paramagnetic phase, while the density of states
is gapless in ferromagnetic phase. This can explain metal-insulator transition frequently observed in manganites and magnetic
semiconductors. Activated conductivity in the insulator phase is numerically calculated.
Received 13 June 2000 and Received in final form 5 January 2001 |
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| Keywords: | PACS 75 50 Pp Magnetic semiconductors – 75 30 Vn Colossal magnetoresistance – 72 10 -d Theory of electronic transport scattering mechanisms |
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