Superconductivity in lanthanum barium cuprate perovskites

S. A. Sunshine; J. V. Waszczak; D. W. Murphy; S. Miraglia; A. Santoro; F. Beech

doi:https://doi.org/10.1016/0022-0248(87)90036-4

Superconductivity in lanthanum barium cuprate perovskites

S. A. Sunshine, J. V. Waszczak, D. W. Murphy, S. Miraglia, A. Santoro, F. Beech

Chemistry and Biochemistry

Montclair State University

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

34 Scopus citations

Abstract

Samples in the system Ba_2-xLa_1+xCu₃O_7-δ (0.0 ≤ x ≤ 0.5; 0 < δ < 0.25) have been prepared and characterized by X-ray powder diffraction, magnetic susceptibility, electrical resistivity, and for x = 0.5 powder neutron diffraction. This neutron diffraction study on Ba_1.5La_1.5Cu₃O_7.25 indicates that the structure is similar to the 92 K superconductor Ba₂YCu₃O₇ with two exceptions. First, the "Ba site" contains 75% Ba and 25% La and second, the symmetry is tetragonal. At x = 0.5 the material is a semiconductor, but as x decreases metallic behavior and superconductivity are observed. Compositions with x < 0.2 contain traces of BaCuO₂, but exhibit T^onset_c ≈ 90 K and R = 0 near 80 K. For x = 0.2-0.3, T^onset_c ≈ 60 K and R = 0 near 50 K are observed . For x ≤ 0.1 orthorhombic symmetry is observed. These results provide further evidence that oxygen stoichiometry and details of the oxygen ordering are important to superconductivity.

Original language	English
Pages (from-to)	632-638
Number of pages	7
Journal	Journal of Crystal Growth
Volume	85
Issue number	4
DOIs	https://doi.org/10.1016/0022-0248(87)90036-4
State	Published - Dec 1987

ASJC Scopus subject areas

Condensed Matter Physics
Inorganic Chemistry
Materials Chemistry

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title = "Superconductivity in lanthanum barium cuprate perovskites",

abstract = "Samples in the system Ba2-xLa1+xCu3O7-δ (0.0 ≤ x ≤ 0.5; 0 < δ < 0.25) have been prepared and characterized by X-ray powder diffraction, magnetic susceptibility, electrical resistivity, and for x = 0.5 powder neutron diffraction. This neutron diffraction study on Ba1.5La1.5Cu3O7.25 indicates that the structure is similar to the 92 K superconductor Ba2YCu3O7 with two exceptions. First, the {"}Ba site{"} contains 75% Ba and 25% La and second, the symmetry is tetragonal. At x = 0.5 the material is a semiconductor, but as x decreases metallic behavior and superconductivity are observed. Compositions with x < 0.2 contain traces of BaCuO2, but exhibit Tonsetc ≈ 90 K and R = 0 near 80 K. For x = 0.2-0.3, Tonsetc ≈ 60 K and R = 0 near 50 K are observed . For x ≤ 0.1 orthorhombic symmetry is observed. These results provide further evidence that oxygen stoichiometry and details of the oxygen ordering are important to superconductivity.",

author = "Sunshine, {S. A.} and Waszczak, {J. V.} and Murphy, {D. W.} and S. Miraglia and A. Santoro and F. Beech",

year = "1987",

month = dec,

doi = "https://doi.org/10.1016/0022-0248(87)90036-4",

language = "English",

volume = "85",

pages = "632--638",

journal = "Journal of Crystal Growth",

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T1 - Superconductivity in lanthanum barium cuprate perovskites

AU - Sunshine, S. A.

AU - Waszczak, J. V.

AU - Murphy, D. W.

AU - Miraglia, S.

AU - Santoro, A.

AU - Beech, F.

PY - 1987/12

Y1 - 1987/12

N2 - Samples in the system Ba2-xLa1+xCu3O7-δ (0.0 ≤ x ≤ 0.5; 0 < δ < 0.25) have been prepared and characterized by X-ray powder diffraction, magnetic susceptibility, electrical resistivity, and for x = 0.5 powder neutron diffraction. This neutron diffraction study on Ba1.5La1.5Cu3O7.25 indicates that the structure is similar to the 92 K superconductor Ba2YCu3O7 with two exceptions. First, the "Ba site" contains 75% Ba and 25% La and second, the symmetry is tetragonal. At x = 0.5 the material is a semiconductor, but as x decreases metallic behavior and superconductivity are observed. Compositions with x < 0.2 contain traces of BaCuO2, but exhibit Tonsetc ≈ 90 K and R = 0 near 80 K. For x = 0.2-0.3, Tonsetc ≈ 60 K and R = 0 near 50 K are observed . For x ≤ 0.1 orthorhombic symmetry is observed. These results provide further evidence that oxygen stoichiometry and details of the oxygen ordering are important to superconductivity.

AB - Samples in the system Ba2-xLa1+xCu3O7-δ (0.0 ≤ x ≤ 0.5; 0 < δ < 0.25) have been prepared and characterized by X-ray powder diffraction, magnetic susceptibility, electrical resistivity, and for x = 0.5 powder neutron diffraction. This neutron diffraction study on Ba1.5La1.5Cu3O7.25 indicates that the structure is similar to the 92 K superconductor Ba2YCu3O7 with two exceptions. First, the "Ba site" contains 75% Ba and 25% La and second, the symmetry is tetragonal. At x = 0.5 the material is a semiconductor, but as x decreases metallic behavior and superconductivity are observed. Compositions with x < 0.2 contain traces of BaCuO2, but exhibit Tonsetc ≈ 90 K and R = 0 near 80 K. For x = 0.2-0.3, Tonsetc ≈ 60 K and R = 0 near 50 K are observed . For x ≤ 0.1 orthorhombic symmetry is observed. These results provide further evidence that oxygen stoichiometry and details of the oxygen ordering are important to superconductivity.

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U2 - https://doi.org/10.1016/0022-0248(87)90036-4

DO - https://doi.org/10.1016/0022-0248(87)90036-4

M3 - Article

VL - 85

SP - 632

EP - 638

JO - Journal of Crystal Growth

JF - Journal of Crystal Growth

SN - 0022-0248

IS - 4

ER -

Superconductivity in lanthanum barium cuprate perovskites

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