EPR studies of (Bi, Pb)-2223 phase substituted by Ruthenium ions

被引：11

作者：

Abou-Aly, A. I. ^{[1
]}

Awad, R. ^{[1
]}

Mahmoud, S. A. ^{[1
]}

Barakat, M. Me. ^{[1
]}

机构：

[1] Univ Alexandria, Fac Sci, Dept Phys, Alexandria, Egypt

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2011年 / 509卷 / 27期

关键词：

(Bi; Pb)-2223; phase; Ru-content; EPR; Curie temperature; ELECTRON-PARAMAGNETIC-RESONANCE; PHYSICAL-PROPERTIES; SINGLE-CRYSTAL; SUPERCONDUCTOR; OXIDE; SUSCEPTIBILITY; RESISTIVITY; MOMENT;

D O I：

10.1016/j.jallcom.2011.03.160

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

This work studied X-ray powder diffraction (XRD), electrical resistivity and electron paramagnetic resonance (EPR) measurements for Bi1.8Pb0.4Sr2Ca2.1Cu3-xRuxO10+delta (0.0 <= x <= 0.4) superconducting samples. XRD analysis and electrical resistivity data showed that the low-content of Ru, x <= 0.05, enhanced both the phase formation and the superconducting transition temperature of (Bi, Pb)-2223 phase. A phase change from (Bi, Pb)-2223 phase to (Bi, Pb)-2212 phase was reported for x >= 0.15. Two EPR lines were observed for 0.0 <= x <= 0.075, indicating the presence of both (Bi, Pb)-2223 and (Bi, Pb)-2212 phases. While, one EPR line was observed for x >= 0.15, corresponding to the (Bi, Pb)-2212 phase formation. The number of spins (N) participating in the resonance and its spin paramagnetic susceptibility (chi), for the two phases, were calculated as a function of both Ru-content and temperature. In addition, we reported the variation of activation energy (E-a), Curie constant (C), Curie temperature (theta) and effective magnetic moment (mu) with Ru-content. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：7381 / 7388

页数：8

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