SUPERCONDUCTING, MAGNETIC, ELECTRONIC TRANSPORT, AND STRUCTURAL-PROPERTIES OF (R1.5CE0.5)SR2CU2NBO10, R = PR, ND, SM, EU

被引：58

作者：

GOODWIN, TJ ^{[1
]}

RADOUSKY, HB ^{[1
]}

SHELTON, RN ^{[1
]}

机构：

[1] LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550

来源：

PHYSICA C | 1992年 / 204卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0921-4534(92)90592-Z

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The (R1.5Ce0.5)Sr2Cu2NbO10 system has been characterized for R = Pr, Nd, Sn , and Eu using X-ray diffraction, resistivity, and magnetization measurements. (Nd1.5Ce0.5)Sr2Cu2NbO10 has been previously reported and is confirmed to be a superconductor with T(c) near 28 K. (Sm1.5Ce0.5)Sr2Cu2NbO10 and (Eu1.5Ce0.5)Sr2Cu2NbO10 are also superconductors with T(c)s near 28 K. (Pr1.5Ce0.5)Sr2Cu2NbO10 is not superconducting and is an insulator. In addition, magnetic susceptibility data reveal two magnetic ordering transitions at 17 K and 53 K for (Pr1.5Ce0.5)Sr2Cu2NbO10. In contrast, lo such transitions are observed for R = Nd, Sm, or Eu down to 2 K. This behavior is analogous to that found for R = Pr or Cm in the RBa2Cu3O7-x system and for R = Pr in the RBa2Cu2NbO8 system. A proposal is made for the generalization of a correlation between an anomalously high Neel temperature and the lack of superconductivity in RBa2Cu3O7-x related structures.

引用

页码：212 / 224

页数：13

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