Structural and physical properties of the tetragonal superconductors LaBaACu3O7-δ (A = Ca and Sr)

W. T. Fu; H. W. Zandbergen; C. J. Van Der Beek; A. A. Verheijen; L. J. De Jongh; V. A.M. Brabers

doi:10.1016/0022-5088(89)90319-6

Structural and physical properties of the tetragonal superconductors LaBaACu₃O_7-δ (A = Ca and Sr)

W. T. Fu
, H. W. Zandbergen
, C. J. Van Der Beek
, A. A. Verheijen
, L. J. De Jongh
, V. A.M. Brabers

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

Abstract

The compounds LaBaACu₃O_7-δ (A = Ca and Sr) have been prepared and characterized by X-ray diffraction and electron microscopy. Their structure is similar to that of YBa₂Cu₃O₇, except that they are tetragonal. Electron diffraction of LaCaBaCu₃O_7-δ reveals the presence of a weak superstructure having doubled, a, b and c axes. The oxygen content and superconducting transition temperature were found to vary significantly, depending on the post-annealing conditions. Oxygen- and air-annealed samples have T_c values of 76 K and 60 K for A = Ca and 50 K and 33 K for A = Sr respectively. Air-quenched samples exhibit semiconductor-like behaviour in both cases. The d.c. resistivity and a.c. susceptibility vs. temperature data for LaBaSrCu₃O_7-δ are presented. The absence of an orthorhombic unit cell for these compounds is discussed and a model for the oxygen-vacancy ordering is proposed to explain the observed superstructure in LaBaCaCu₃O_7-δ.

Original language	English
Pages (from-to)	213-220
Number of pages	8
Journal	Journal of The Less-Common Metals
Volume	151
Issue number	C
DOIs	https://doi.org/10.1016/0022-5088(89)90319-6
Publication status	Published - 15 May 1989
Externally published	Yes

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10.1016/0022-5088(89)90319-6

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@article{54cde70242c740129b19e02a806d32a4,

title = "Structural and physical properties of the tetragonal superconductors LaBaACu3O7-δ (A = Ca and Sr)",

abstract = "The compounds LaBaACu3O7-δ (A = Ca and Sr) have been prepared and characterized by X-ray diffraction and electron microscopy. Their structure is similar to that of YBa2Cu3O7, except that they are tetragonal. Electron diffraction of LaCaBaCu3O7-δ reveals the presence of a weak superstructure having doubled, a, b and c axes. The oxygen content and superconducting transition temperature were found to vary significantly, depending on the post-annealing conditions. Oxygen- and air-annealed samples have Tc values of 76 K and 60 K for A = Ca and 50 K and 33 K for A = Sr respectively. Air-quenched samples exhibit semiconductor-like behaviour in both cases. The d.c. resistivity and a.c. susceptibility vs. temperature data for LaBaSrCu3O7-δ are presented. The absence of an orthorhombic unit cell for these compounds is discussed and a model for the oxygen-vacancy ordering is proposed to explain the observed superstructure in LaBaCaCu3O7-δ.",

author = "Fu, \{W. T.\} and Zandbergen, \{H. W.\} and \{Van Der Beek\}, \{C. J.\} and Verheijen, \{A. A.\} and \{De Jongh\}, \{L. J.\} and Brabers, \{V. A.M.\}",

year = "1989",

month = may,

day = "15",

doi = "10.1016/0022-5088(89)90319-6",

language = "English",

volume = "151",

pages = "213--220",

journal = "Journal of The Less-Common Metals",

issn = "0022-5088",

number = "C",

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TY - JOUR

T1 - Structural and physical properties of the tetragonal superconductors LaBaACu3O7-δ (A = Ca and Sr)

AU - Fu, W. T.

AU - Zandbergen, H. W.

AU - Van Der Beek, C. J.

AU - Verheijen, A. A.

AU - De Jongh, L. J.

AU - Brabers, V. A.M.

PY - 1989/5/15

Y1 - 1989/5/15

N2 - The compounds LaBaACu3O7-δ (A = Ca and Sr) have been prepared and characterized by X-ray diffraction and electron microscopy. Their structure is similar to that of YBa2Cu3O7, except that they are tetragonal. Electron diffraction of LaCaBaCu3O7-δ reveals the presence of a weak superstructure having doubled, a, b and c axes. The oxygen content and superconducting transition temperature were found to vary significantly, depending on the post-annealing conditions. Oxygen- and air-annealed samples have Tc values of 76 K and 60 K for A = Ca and 50 K and 33 K for A = Sr respectively. Air-quenched samples exhibit semiconductor-like behaviour in both cases. The d.c. resistivity and a.c. susceptibility vs. temperature data for LaBaSrCu3O7-δ are presented. The absence of an orthorhombic unit cell for these compounds is discussed and a model for the oxygen-vacancy ordering is proposed to explain the observed superstructure in LaBaCaCu3O7-δ.

AB - The compounds LaBaACu3O7-δ (A = Ca and Sr) have been prepared and characterized by X-ray diffraction and electron microscopy. Their structure is similar to that of YBa2Cu3O7, except that they are tetragonal. Electron diffraction of LaCaBaCu3O7-δ reveals the presence of a weak superstructure having doubled, a, b and c axes. The oxygen content and superconducting transition temperature were found to vary significantly, depending on the post-annealing conditions. Oxygen- and air-annealed samples have Tc values of 76 K and 60 K for A = Ca and 50 K and 33 K for A = Sr respectively. Air-quenched samples exhibit semiconductor-like behaviour in both cases. The d.c. resistivity and a.c. susceptibility vs. temperature data for LaBaSrCu3O7-δ are presented. The absence of an orthorhombic unit cell for these compounds is discussed and a model for the oxygen-vacancy ordering is proposed to explain the observed superstructure in LaBaCaCu3O7-δ.

U2 - 10.1016/0022-5088(89)90319-6

DO - 10.1016/0022-5088(89)90319-6

M3 - Article

AN - SCOPUS:0024663161

SN - 0022-5088

VL - 151

SP - 213

EP - 220

JO - Journal of The Less-Common Metals

JF - Journal of The Less-Common Metals

IS - C

ER -

Structural and physical properties of the tetragonal superconductors LaBaACu3O7-δ (A = Ca and Sr)

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Structural and physical properties of the tetragonal superconductors LaBaACu₃O_7-δ (A = Ca and Sr)