Superconducting and magnetic properties of Sn-doped Ru-1222

被引：10

作者：

Balchev, N. ^{[1
]}

Nenkov, K. ^{[2
,3
]}

Mihova, G. ^{[1
]}

Kunev, B. ^{[4
]}

Pirov, J. ^{[5
]}

机构：

[1] Bulgarian Acad Sci, Inst Solid State Phys, Sofia 1784, Bulgaria

[2] Inst Festkorper & Werkstofforsch, D-01171 Dresden, Germany

[3] Int Lab High Magnet Fields & Low Temp, PL-53421 Wroclaw, Poland

[4] Bulgarian Acad Sci, Inst Catalysis, Sofia 1113, Bulgaria

[5] Bulgarian Acad Sci, Ctr Lab Photoproc, Sofia 1113, Bulgaria

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2007年 / 467卷 / 1-2期

关键词：

Ru-1222; Sn-doping; superconductivity; magnetism;

D O I：

10.1016/j.physc.2007.10.008

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Samples with nominal compositions Ru1-xSnxSr2Gd1.4Ce0.6Cu0.6Oy (0 <= x <= 0.2) were synthesized and their superconducting and magnetic properties were investigated. A non-monotonic behaviour of the lattice parameters and T, with the increase of the dopant content was observed. It was established that small doping levels (O < x <= 0.05) significantly increase the T. of the Ru-1222 samples, prepared at the same conditions - from 20 K for the undoped sample to 35 K for the x = 0.03 one. The 0.1 <= x <= 0.2 samples are not superconducting, i.e. the Sn-doping more rapidly destroys the superconductivity in Ru- 1222 than in the conventional superconductors. The initial increase of T-c was associated with an increase of the hole concentration. The decrease of T-c and suppression of SC at higher doping levels may be explained by an enhanced disorder in the system, due to a possible presence of Sn in both Ru and Cu sites. The latter fact could also explain that the onset of the magnetic transition T-mag weakly depends on the dopant content. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：174 / 178

页数：5

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