title: Nanoscale Conductive Channels in Silicon Whiskers with Nickel Impurity.
abstract: The magnetization and magnetoresistance of Si whiskers doped with <Ni, B> to boron concentrations corresponding to the metal-insulator transition (2 × 1018cm-3÷ 5 × 1018cm-3) were measured at high magnetic fields up to 14 T in a wide temperature range 4.2-300 K. Hysteresis of the magnetic moment was observed for Si p-type whiskers with nickel impurity in a wide temperature range 4.2-300 K indicating a strong interaction between the Ni impurities and the possibility of a magnetic cluster creation. The introduction of Ni impurity in Si whiskers leads to appearance and increase of the magnitude of negative magnetoresistance up to 10% as well as to the decrease of the whisker resistivity in the range of hopping conductance at low temperatures. The abovementioned effects were explained in the framework of appearance of magnetic polarons leading to modification of the conductive channels in the subsurface layers of the whiskers.
authors.affiliation: Lviv Polytechnic National University, 12 S. Bandera Str, 79013, Lviv, Ukraine. didrov13@ukr.net.
authors.forename: Serhii
authors.initials: S
authors.lastname: Yatsukhnenko
authors.affiliation: Lviv Polytechnic National University, 12 S. Bandera Str, 79013, Lviv, Ukraine.|International Laboratory of High Magnetic Fields and Low Temperatures, Gajowicka 95, Wroclaw, Poland.
authors.forename: Anatoly
authors.initials: A
authors.lastname: Druzhinin
authors.affiliation: Lviv Polytechnic National University, 12 S. Bandera Str, 79013, Lviv, Ukraine.|International Laboratory of High Magnetic Fields and Low Temperatures, Gajowicka 95, Wroclaw, Poland.
authors.forename: Igor
authors.initials: I
authors.lastname: Ostrovskii
authors.affiliation: Lviv Polytechnic National University, 12 S. Bandera Str, 79013, Lviv, Ukraine.|International Laboratory of High Magnetic Fields and Low Temperatures, Gajowicka 95, Wroclaw, Poland.
authors.forename: Yuriy
authors.initials: Y
authors.lastname: Khoverko
authors.affiliation: Lviv Polytechnic National University, 12 S. Bandera Str, 79013, Lviv, Ukraine.
authors.forename: Mukhajlo
authors.initials: M
authors.lastname: Chernetskiy
keywords: Clusters; Impurity; Magnetoresistance; Polaron; Whiskers