Neutron powder diffraction study on Eu-substituted Bi2Sr2CaCu2O8+y high temperature superconductor

Olli Antson, Tarja Karlemo, Maarit Karppinen, Kari Ullakko

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Abstract

We have used a neutron powder diffraction method to study the structural changes in the Bi2Sr2Ca1−xEuxCu2O8+y compound caused by the partial substitution of Ca by Eu. Besides the systematic variation of the parameters of the orthorhombic 5.4 ÅX5.4 ÅX30.7 Å sub-cell, we observed atomic rearrangement in the BiO-layer and modifications in the square-pyramidal coordination polyhedra of the Cu ion. The onset temperature Tonset as determined by the AC susceptibility method has a broad maximum at x = 0.3, and no superconductivity is observed at x = 0.6 in the temperature range T > 4.2 K. We discuss also about the reasons for the broadening of the transition range and the decrease of the Meissner fraction concomitant to the increase of the Eu concentration.

Original languageEnglish
Pages (from-to)65 - 74
Number of pages10
JournalPhysica C: Superconductivity and its Applications
Volume173
Issue number1-2
DOIs
Publication statusPublished - 1991
MoE publication typeA1 Journal article-refereed

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Neutron powder diffraction
High temperature superconductors
high temperature superconductors
neutrons
Superconductivity
polyhedrons
diffraction
alternating current
Substitution reactions
superconductivity
Ions
substitutes
magnetic permeability
Temperature
temperature
cells
ions

Cite this

Antson, Olli ; Karlemo, Tarja ; Karppinen, Maarit ; Ullakko, Kari. / Neutron powder diffraction study on Eu-substituted Bi2Sr2CaCu2O8+y high temperature superconductor. In: Physica C: Superconductivity and its Applications. 1991 ; Vol. 173, No. 1-2. pp. 65 - 74.
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abstract = "We have used a neutron powder diffraction method to study the structural changes in the Bi2Sr2Ca1−xEuxCu2O8+y compound caused by the partial substitution of Ca by Eu. Besides the systematic variation of the parameters of the orthorhombic 5.4 {\AA}X5.4 {\AA}X30.7 {\AA} sub-cell, we observed atomic rearrangement in the BiO-layer and modifications in the square-pyramidal coordination polyhedra of the Cu ion. The onset temperature Tonset as determined by the AC susceptibility method has a broad maximum at x = 0.3, and no superconductivity is observed at x = 0.6 in the temperature range T > 4.2 K. We discuss also about the reasons for the broadening of the transition range and the decrease of the Meissner fraction concomitant to the increase of the Eu concentration.",
author = "Olli Antson and Tarja Karlemo and Maarit Karppinen and Kari Ullakko",
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Neutron powder diffraction study on Eu-substituted Bi2Sr2CaCu2O8+y high temperature superconductor. / Antson, Olli; Karlemo, Tarja; Karppinen, Maarit; Ullakko, Kari.

In: Physica C: Superconductivity and its Applications, Vol. 173, No. 1-2, 1991, p. 65 - 74.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Neutron powder diffraction study on Eu-substituted Bi2Sr2CaCu2O8+y high temperature superconductor

AU - Antson, Olli

AU - Karlemo, Tarja

AU - Karppinen, Maarit

AU - Ullakko, Kari

PY - 1991

Y1 - 1991

N2 - We have used a neutron powder diffraction method to study the structural changes in the Bi2Sr2Ca1−xEuxCu2O8+y compound caused by the partial substitution of Ca by Eu. Besides the systematic variation of the parameters of the orthorhombic 5.4 ÅX5.4 ÅX30.7 Å sub-cell, we observed atomic rearrangement in the BiO-layer and modifications in the square-pyramidal coordination polyhedra of the Cu ion. The onset temperature Tonset as determined by the AC susceptibility method has a broad maximum at x = 0.3, and no superconductivity is observed at x = 0.6 in the temperature range T > 4.2 K. We discuss also about the reasons for the broadening of the transition range and the decrease of the Meissner fraction concomitant to the increase of the Eu concentration.

AB - We have used a neutron powder diffraction method to study the structural changes in the Bi2Sr2Ca1−xEuxCu2O8+y compound caused by the partial substitution of Ca by Eu. Besides the systematic variation of the parameters of the orthorhombic 5.4 ÅX5.4 ÅX30.7 Å sub-cell, we observed atomic rearrangement in the BiO-layer and modifications in the square-pyramidal coordination polyhedra of the Cu ion. The onset temperature Tonset as determined by the AC susceptibility method has a broad maximum at x = 0.3, and no superconductivity is observed at x = 0.6 in the temperature range T > 4.2 K. We discuss also about the reasons for the broadening of the transition range and the decrease of the Meissner fraction concomitant to the increase of the Eu concentration.

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DO - 10.1016/0921-4534(91)90794-Y

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JF - Physica C: Superconductivity and its Applications

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