ESR-SPECTRA AND LOW-FIELD MICROWAVE-ABSORPTION IN BISMUTH AND THALLIUM BASED CUPRATE SUPERCONDUCTORS

被引：7

作者：

EDWARDS, PP

JANES, R

LIU, RS

WU, PT

CHANG, CT

机构：

[1] IND TECHNOL RES INST,MAT RES LABS,HSINCHU,TAIWAN

[2] INST ATOM & MOLEC SCI ACAD,TAIPEI,TAIWAN

[3] NATL TSING HUA UNIV,DEPT CHEM,HSINCHU 300,TAIWAN

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS | 1990年 / 29卷 / 02期

关键词：

Bi(Pb)-Ca-SrCu-0; Bi-Ca-Sr-Cu-0; Electron Spin Resonance; ESR; High- Tc oxide superconductors; TI-Ca-Ba-Cu-0; TI[!sub]0.5[!/sub]Pb[!sub]0.5[!/sub](Ca[!sub]0.8[!/sub]A[!sub]0.2[!/sub])Sr[!sub]2[!/sub]Cu[!sub]2[!/sub]O[!sub]y[!/sub](A=Y or Er);

D O I：

10.1143/JJAP.29.L258

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Electron Spin Resonance and low-field microwave absorption are reported for a range of Bi- and Tl-based superconductors in the Bi-Ca-Sr-Cu-O, Bi(Pb)-Ca-Sr-Cu-O and Tl-Ca-Ba-Cu-O series together with the new monophasic series (Tl0.5Pb0.5)(Ca0.8A0.2)Sr2Cu2Oy(A=Y or Er) superconductors. In contrast to two recent reports of ESR in the Tl-Ca-Ba-Cu-O and Bi(Pb)-Ca-Sr-Cu-O systems, we find: (i) no evidence of any “intrinsic” Cu2+ESR signals close to the free spin region, and (ii) no evidence of a (low-field) microwave absorption at temperatures above Tc. The question of ESR silence in these oxide superconductors and related phases is discussed. © 1990 IOP Publishing Ltd.

引用

页码：L258 / L261

页数：4

共 18 条

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