Crystal structure of the tetragonal superconductor CaLaBaCu3Ox (6.69≤x≤6.94)

S. Katano; K. Yamaya; J. A. Fernandez-Baca; S. Funahashi

doi:10.1016/0921-4534(93)90795-R

Crystal structure of the tetragonal superconductor CaLaBaCu₃O_x (6.69≤x≤6.94)

S. Katano, K. Yamaya, J. A. Fernandez-Baca, S. Funahashi

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Abstract

The room-temperature crystalline structure of CaLaBaCu₃O_x has been studied by high-resolution neutron powder diffraction. The profile analysis on specimens with oxygen contents x ranging from 6.94 (80 K superconductor) to 6.69 (non-superconductor) indicates that these compounds are isostructural with the non-superconducting tetragonal YBa₂Cu₃O_y (y<6.4, space group P4/mmm), and that Ca and La atoms occupy the Y and Ba sites of the YBCO structure almost randomly. The changes in bond lengths with x are essentially the same as those of YBa₂Cu₃O_y. The superconductivity of the system can be understood in terms of the charge transfer between the superconducting CuO₂ plane and the basal CuO plane, which would explain the variation of T_c with the change in oxygen content. The similarities and differences between this system and YBa₂Cu₃O_y are discussed.

Original language	English
Pages (from-to)	73-78
Number of pages	6
Journal	Physica C: Superconductivity and its Applications
Volume	217
Issue number	1-2
DOIs	https://doi.org/10.1016/0921-4534(93)90795-R
State	Published - Nov 10 1993

Funding

Scienceo f the US Departmenot f Energy under Contract No. DE-AC05-84OR21400.

Funders	Funder number
US Departmenot f Energy

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10.1016/0921-4534(93)90795-R

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abstract = "The room-temperature crystalline structure of CaLaBaCu3Ox has been studied by high-resolution neutron powder diffraction. The profile analysis on specimens with oxygen contents x ranging from 6.94 (80 K superconductor) to 6.69 (non-superconductor) indicates that these compounds are isostructural with the non-superconducting tetragonal YBa2Cu3Oy (y<6.4, space group P4/mmm), and that Ca and La atoms occupy the Y and Ba sites of the YBCO structure almost randomly. The changes in bond lengths with x are essentially the same as those of YBa2Cu3Oy. The superconductivity of the system can be understood in terms of the charge transfer between the superconducting CuO2 plane and the basal CuO plane, which would explain the variation of Tc with the change in oxygen content. The similarities and differences between this system and YBa2Cu3Oy are discussed.",

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AU - Fernandez-Baca, J. A.

AU - Funahashi, S.

PY - 1993/11/10

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N2 - The room-temperature crystalline structure of CaLaBaCu3Ox has been studied by high-resolution neutron powder diffraction. The profile analysis on specimens with oxygen contents x ranging from 6.94 (80 K superconductor) to 6.69 (non-superconductor) indicates that these compounds are isostructural with the non-superconducting tetragonal YBa2Cu3Oy (y<6.4, space group P4/mmm), and that Ca and La atoms occupy the Y and Ba sites of the YBCO structure almost randomly. The changes in bond lengths with x are essentially the same as those of YBa2Cu3Oy. The superconductivity of the system can be understood in terms of the charge transfer between the superconducting CuO2 plane and the basal CuO plane, which would explain the variation of Tc with the change in oxygen content. The similarities and differences between this system and YBa2Cu3Oy are discussed.

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Crystal structure of the tetragonal superconductor CaLaBaCu₃O_x (6.69≤x≤6.94)

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