Structural changes of superconducting YBa2Cu4O8 under high pressure

Y. Yamada; J. D. Jorgensen; Shiyou Pei; P. Lightfoot; Y. Kodama; T. Matsumoto; F. Izumi

doi:10.1016/0921-4534(91)90367-8

Structural changes of superconducting YBa₂Cu₄O₈ under high pressure

Y. Yamada^*, J. D. Jorgensen, Shiyou Pei, P. Lightfoot, Y. Kodama, T. Matsumoto, F. Izumi

^*Corresponding author for this work

School of Chemistry

Research output: Contribution to journal › Article › peer-review

120 Citations (Scopus)

Abstract

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 distance 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.

Original language	English
Pages (from-to)	185-194
Number of pages	10
Journal	Physica C: Superconductivity and its applications
Volume	173
Issue number	3-4
DOIs	https://doi.org/10.1016/0921-4534(91)90367-8
Publication status	Published - 1 Feb 1991

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title = "Structural changes of superconducting YBa2Cu4O8 under high pressure",

abstract = "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 distance 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 Tc under high pressure.",

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AU - Yamada, Y.

AU - Jorgensen, J. D.

AU - Pei, Shiyou

AU - Lightfoot, P.

AU - Kodama, Y.

AU - Matsumoto, T.

AU - Izumi, F.

PY - 1991/2/1

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AB - 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 distance 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 Tc under high pressure.

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Structural changes of superconducting YBa₂Cu₄O₈ under high pressure

Abstract

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