EPR Studies of Tl0.5Pb0.5Sr1.6Ba0.4CaCu2-x Ru x O7-δ Superconductor

被引：3
作者：
Awad, R. [1 ]
Abou-Aly, A. I. [1 ]
Mahmoud, S. A. [1 ]
Barakat, M. M. E. [1 ]
机构：
[1] Univ Alexandria, Dept Phys, Fac Sci, Alexandria 21511, Egypt
来源：
APPLIED MAGNETIC RESONANCE | 2011年 / 41卷 / 01期
关键词：
MAGNETIC-PROPERTIES; ELECTRICAL-RESISTIVITY; STATE; MAGNETORESISTANCE; SUSCEPTIBILITY; SUBSTITUTION; TEMPERATURE; DEPENDENCE; PHASE; OXIDE;
D O I：
10.1007/s00723-011-0245-1
中图分类号：
O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];
学科分类号：
070203 ; 070304 ; 081704 ; 1406 ;
摘要：
Bulk superconducting samples of type Tl0.5Pb0.5Sr1.6Ba0.4CaCu2-x Ru (x) O7-delta, (Tl, Pb)/Sr-1212, with 0.0 a parts per thousand currency sign x a parts per thousand currency sign 0.525 were prepared by the conventional one-step solid-state reaction technique. The prepared samples were investigated using X-ray powder diffraction, electrical resistivity and electron paramagnetic resonance (EPR) measurements. Enhancement of the phase formation, superconducting transition temperature T (c) and hole carriers concentration P was observed up to x = 0.075. For x > 0.075, a reverse trend was observed. EPR spectra were measured at different temperatures (120-290 K) for all prepared samples. The number of spins N participating in the resonance and the paramagnetic susceptibility chi were calculated as a function of both Ru-content and temperature. N and chi increased as the Ru-content increased. A linear relationship between logN and 1/T was established, from which the activation energy E (a) was calculated as a function of the Ru-content. The temperature dependence of chi was fitted according to Curie-Weiss type of magnetic behavior. Curie constant C, Curie temperature theta, the effective magnetic moment mu and the electronic specific heat gamma were estimated as a function of the Ru-content.
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页码：79 / 93
页数：15
相关论文
共 45 条
[1]   Stabilization of Tl-1223 Phase by Arsenic Substitution [J].
Abou Aly, A. I. ;
Ibrahim, I. H. ;
Awad, R. ;
El-Harizy, A. ;
Khalaf, A. .
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM, 2010, 23 (07) :1325-1332
[2]   EPR studies of (Bi, Pb)-2223 phase substituted by Ruthenium ions [J].
Abou-Aly, A. I. ;
Awad, R. ;
Mahmoud, S. A. ;
Barakat, M. Me. .
JOURNAL OF ALLOYS AND COMPOUNDS, 2011, 509 (27) :7381-7388
[3]   Electrical Resistivity and Magnetoresistance Studies of (Bi,Pb)-2223 Phase Substituted by Ru [J].
Abou-Aly, A. I. ;
Mahmoud, S. A. ;
Awad, R. ;
Barakat, M. M. E. .
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM, 2010, 23 (08) :1575-1588
[4]   Study of the localization and Cooper pair breaking in Tl1-xErxBa2Ca2Cu3O9-δ [J].
Abou-Aly, AI ;
Mohammed, NH ;
Awad, R ;
Ibrahim, IH .
SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 2000, 13 (07) :1107-1112
[5]  
ABRIKOSOV AA, 1961, SOV PHYS JETP-USSR, V12, P1243
[6]   The Effect of Ru Substitution on the Thermal, Structural and Magnetic Properties of Bi3Sr2Ca2Cu3O δ Superconducting System [J].
Aksan, M. A. ;
Yakinci, M. E. ;
Kadowaki, K. .
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM, 2010, 23 (03) :371-380
[7]  
Aschcroft N.W., 2001, SOLID STATE PHYS
[8]   Normal-state Conduction Mechanisms in GdBa2Cu3-x Ru x O7-δ Superconducting Phase [J].
Awad, R. ;
Abou-Aly, A. I. ;
Mahmoud, S. A. ;
Barakat, M. Me. .
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM, 2011, 24 (08) :2227-2236
[9]   Improvement the superconducting parameters of Tl-1212 by Ruthenium substitution [J].
Awad, R. .
8TH EUROPEAN CONFERENCE ON APPLIED SUPERCONDUCTIVITY (EUCAS'07), 2008, 97
[10]   Synthesis, superconductivity and magnetism of RSr(2)Cu(2)NbO(7+delta) compounds (R=Y, Pr and Gd) [J].
Awana, VPS ;
Menon, L ;
Malik, SK .
PHYSICA C, 1996, 262 (3-4) :266-271
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