HALL EFFECT, THERMOPOWER AND ELECTRICAL RESISTIVITY OF DOPED RuSr₂GdCu₂O₈ SYSTEM

Abstract

Polycrystalline samples of Ru 1−x SbxSr 2 GdCuO 8 doped with Sb, in which magnetic order and superconductivity coexist with T magnetic Tc, were prepared by a solid state reaction technique. Lattice parameters, electrical resistivity, Hall and thermopower coefficients measurements on the same sintered ceramic samples are presented.Both Hall effect and thermopower show anomalous decreases below T magnetic which might be explained with a simple two-band model in the RuO 2 layer at T magnetic . It was also observed that the Sb doping reduce the conductivity of the system and the transition temperature decreases with increasing Sb content. This may be due to a distortion of RuO 6 octahedra which is responsible for the increase of hole localization.

Investigation of electrical characteristics of different ceramic samples using Hall effect measurement

“…Hall measurement was used in material investigation often, for semiconductors especially [1]. It has been used for investigation of polycrystalline and superconductivity [2,3], canonical spin glass [4], superconduc-tors based on semiconductor (Si, Ge) substrate [5], and high temperature superconductors [2]. Lately, the quantum Hall effect [6,7] has become very interesting.…”