PHASE-TRANSFORMATION IN THE SYSTEM SR2LN1-XCEXMCU2O8+DELTA (LN = RARE-EARTH, M = NB, TA) AND SUPERCONDUCTIVITY

被引：7

作者：

BRNICEVIC, N ^{[1
]}

BASIC, I ^{[1
]}

PLANINIC, P ^{[1
]}

GRZETA, B ^{[1
]}

TONKOVIC, M ^{[1
]}

FORSTHUBER, M ^{[1
]}

HILSCHER, G ^{[1
]}

HOLUBAR, T ^{[1
]}

MICHOR, H ^{[1
]}

KIRCHMAYR, H ^{[1
]}

SCHAUDY, G ^{[1
]}

机构：

[1] VIENNA TECH UNIV, INST EXPTL PHYS, A-1040 VIENNA, AUSTRIA

来源：

APPLIED SUPERCONDUCTIVITY | 1993年 / 1卷 / 3-6期

关键词：

D O I：

10.1016/0964-1807(93)90264-3

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Structural and magnetic investigations of the series Sr2Ln1-xCexMCU208+delta, Ln = Pr, Nd, Sm, Eu, Gd, M = Nb, Ta, which can be derived from YBa2CU3O7-delta by replacement of the CuO4 chains with MO6 octahedra, have been performed. Substitution of the rare earth metal atoms by cerium atoms in this series causes the appearance of a second tetragonal phase. For x=0.5 only this second tetragonal phase exists. It has a structure as that found for the superconducting compound Sr2Nd1.5Ce0.5NbCU2O10-delta. Between the semiconducting Sr2Ln0.5Ce0.5MCU2O8+delta and superconducting Sr2Ln1.5Ce0.5MCU2O10-delta compounds, keeping the Ce content constant (Ce0.5), the rare earth stoichiometry can be varied without changing the type of the crystal structure, with superconductivity occurring for Ln>0.9, except for Ln = Pr.

引用

页码：519 / 526

页数：8

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