SYNTHESIS, MAGNETIC AND TRANSPORT PROPERTIES OF Ru_1-xSb_xSr₂GdCu₂O₈ COMPOUNDS

Abstract

Polycrystalline samples with a nominal composition Ru 1-x Sb x Sr 2 GdCu 2 O 8-d were prepared by a solid state reaction technique. A mixture of RuO 2, Sb 2 O 3, Gd 2 O 3, SrCO 3 and CuO was used to obtain the samples. We performed X-ray diffraction analyses, DC susceptibility and transport measurements and the studies showed that the samples were almost pure Ru -1212 phase. We also observed that 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 octahedral which is responsible for the increase of holes localization.

Transport, thermal and magnetic properties of Ru1−xSbxSr2(Gd0.7Ce0.3)2Cu2O10−d

“…7 The Sb +3 ion substitutes for Ru +5 in solid solution has a dramatic effect on the transport and magnetic properties in agreement with Refs. [4,5,7].…”

“…It is known that the Sb 3+ substitution by Ru 5+ should change the hole concentration in CuO 2 planes and might change the superconductivity and magnetic properties in Ru:1222 system [4]. In this report, we have investigated Ru 1Àx Sb x Sr 2 (Gd 0.7 Ce 0.3 ) 2 Cu 2 O 10Àd system, where 0pxp0.06, using electrical resistivity, Hall effect, heat capacity and magnetic measurements.…”

“…The discovery of the coexistence of magnetic order (FM) at T m ¼ 60-180 K and superconductivity (SC) below T c ¼ 30-50 K in the tetragonal rutheno-cuprate layered Ru: 1212, Ru:1222 and, recently, Ru:1232 [1][2][3][4][5][6] raises the question how these two antagonistic states of matter can accommodate each other?. The physical nature of superconducting and ferromagnetic states is far from being understood.…”

HALL EFFECT, THERMOPOWER AND ELECTRICAL RESISTIVITY OF DOPED RuSr2GdCu2O8 SYSTEM

“…The samples microstructure of Ru 1−x Sb x Sr 2 GdCu 2 O 8−d was investigated by X-ray diffraction and the results were presented in the previous work. 17 The lattice parameters are presented in Table 1. The Sb 3+ ion substitutes for Ru in solid solution has a dramatic effect on the transport and magnetic properties, as can be see in the previous work.…”

“…17 In the present work we focus our attention mainly on thermopower and Hall effect measurements on Ru 1−x Sb x GdCu 2 O 3 system.…”