CORRELATION BETWEEN TC AND EU LATTICE VIBRATION IN T'-PHASE SUPERCONDUCTOR (LA1-XEUX)2-YCEYCUO4-DELTA OBSERVED BY EU-151 MOSSBAUER-EFFECT

被引：13

作者：

ITOH, H ^{[1
]}

KUSUHASHI, M ^{[1
]}

TANIWAKI, M ^{[1
]}

机构：

[1] HOKKAIDO UNIV, FAC ENGN, DEPT ELECTR ENGN, SAPPORO, HOKKAIDO 060, JAPAN

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS | 1990年 / 29卷 / 09期

关键词：

(La[!sub]1-x[!/sub]Euxl[!sub]2-y[!/sub]CeyCu0[!sub]4-6[!/sub; !sup]151[!/sup]Eu Mossbauer effect; Debye temperature; High- Tc superconductor; Isomer shift; Lattice vibration; T'; -phase; lattice constant; Tc enhancement;

D O I：

10.1143/JJAP.29.L1604

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The electronic state and lattice vibration of Eu in T'-phase (La1-xEux)2-yCeyO4-δ was studied by 151Eu Mössbauer effect. The isomer shift and the Debye temperature of Eu, \varThetaD, showed that Eu is trivalent, and the Eu-O distance is larger than those in the hole-doped superconductors. With increasing Eu concentration, in spite of the shortening of the lattice constants, \varThetaD in T'-phase decreased. This is probably caused by the increase in the Eu-O distance with the change of Eu-O-La bonding into Eu-O-Eu bonding. A tight correlation between Tc and \varThetaD was found and the relation, Tc=0.772\varThetaD exp (-\varThetaD2/13000), was derived. © 1990 The Japan Society of Applied Physics.

引用

页码：L1604 / L1607

页数：4