Magnetoresistance in La- and Ca-doped YBa2Cu3O7−δ

Magnetic properties and colossal magnetoresistance of La(Ca)MnO3 materials doped with Fe.

The effect of Fe doping ~,20%! on the Mn site in the ferromagnetic ~x50.37! and the antiferromagnetic ~x50.53! phases of La12xCaxMnO3 has been studied. The same ionic radii of Fe 31 and Mn cause no structure change in either series, yet conduction and ferromagnetism have been consistently suppressed by Fe doping. Colossal magnetoresistance has been shifted to lower temperatures, and in some cas...

Magnetoresistance in Sn-Doped In2O3Nanowires

In this work, we present transport measurements of individual Sn-doped In2O3nanowires as a function of temperature and magnetic field. The results showed a localized character of the resistivity at low temperatures as evidenced by the presence of a negative temperature coefficient resistance in temperatures lower than 77 K. The weak localization was pointed as the mechanism responsible by the n...

Colossal Magnetoresistance in Ce Doped Manganese Oxides

T\inneling Magnetoresistance in a Two-Layered La^^Ca^^MnjO Polycrystal

The discovery of giant magnetoresistance (GMR) in magnetic multilayer films [1 -2 ] and granular solids [3 4] has triggered considerable interest in relating the spin-dependent transport phenomena from the viewpoint of both the underlying physics and their immediate application to magnetic storage and sensor technology. A number of the GMR structures have so far been studied, such as magnetic m...

Wigner Crystal and Colossal Magnetoresistance in InSb Doped with Mn

We report magnetotransport investigation of nonmagnetic InSb single crystal doped with manganese at Mn concentration NMn ~ 1,5 × 10(17) cm(-3) in the temperature range T = 300 K-40 mK, magnetic field B = 0-25T and hydrostatic pressure P = 0-17 kbar. Resistivity saturation was observed in the absence of magnetic field at temperatures below 200 mK while applied increasing external magnetic field ...