STRUCTURAL-CHANGES OF SUPERCONDUCTING YBA2CU4O8 UNDER HIGH-PRESSURE

被引：112

作者：

YAMADA, Y

JORGENSEN, JD

PEI, S

LIGHTFOOT, P

KODAMA, Y

MATSUMOTO, T

IZUMI, F

机构：

[1] ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439

[2] ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCOND,ARGONNE,IL 60439

[3] GOVT IND RES INST,KITA KU,NAGOYA,AICHI 462,JAPAN

[4] NATL INST RES INORGAN MAT,TSUKUBA,IBARAKI 305,JAPAN

来源：

PHYSICA C | 1991年 / 173卷 / 3-4期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0921-4534(91)90367-8

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Structural changes in YBa2Cu4O8 have been studied as a function of pressure using TOF neutron powder diffraction with a sample in a helium-gas pressure cell. Its structure contains double chains of edge-sharing [CuO4] squares and two-dimensional CuO2 planes. The distance between an apical oxygen atom and an in-plane copper atom decreases with increasing pressure. The distances between barium and oxygen atoms in the chain and between in-plane copper atoms located on both sides of a Y layer also change significantly with pressure. All of these movements of atoms are closely related to charge transfer from the CuO chain to the CuO2 plane. Calculation of Madelung energies based on our structural parameters shows that the concentration of holes in the conducting CuO2 plane increases appreciably with increasing pressure, which is in good agreement with the observed rise in T(c) under high pressure.

引用

页码：185 / 194

页数：10

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