title: Spin-dependent variable range hopping and magnetoresistance in Ti(1-x)Co(x)O(2) and Zn(1-x)Co(x)O magnetic semiconductor films.
abstract: Magnetic transport properties in Ti(1-x)Co(x)O(2) and Zn(1-x)Co(x)O magnetic semiconductors have been studied experimentally and theoretically. A linear relation of lnρ versus T(-1/2) (ρ is sheet resistance and T is temperature), which shows different slopes and intersections at different magnetic fields, was observed experimentally in the low temperature range. The spin-dependent variable range hopping model has been proposed by taking into account the electron-electron Coulomb interaction and the spin-spin exchange interaction in the same frame, which can well describe the observed magnetic transport properties in Ti(1-x)Co(x)O(2) and Zn(1-x)Co(x)O magnetic semiconductors.
authors.affiliation: School of Physics and Microelectronics, and National Key Laboratory of Crystal Materials, Shandong University, Jinan, Shandong 250100, People's Republic of China. Department of Physics, The University of Texas at Arlington, Box 19059, Arlington, TX 76019, USA.
authors.forename: Shi-Shen
authors.initials: SS
authors.lastname: Yan
authors.forename: J P
authors.initials: JP
authors.lastname: Liu
authors.forename: L M
authors.initials: LM
authors.lastname: Mei
authors.forename: Y F
authors.initials: YF
authors.lastname: Tian
authors.forename: H Q
authors.initials: HQ
authors.lastname: Song
authors.forename: Y X
authors.initials: YX
authors.lastname: Chen
authors.forename: G L
authors.initials: GL
authors.lastname: Liu