Superlattice modulation and superconductivity in the electron-doped Nd2CuO4-xFx and Nd2-xCexCuO4 systems

C. H. Chen; D. J. Werder; A. C.W.P. James; D. W. Murphy; S. Zahurak; R. M. Fleming; B. Batlogg; L. F. Schneemeyer

doi:10.1016/0921-4534(89)90078-6

Superlattice modulation and superconductivity in the electron-doped Nd₂CuO_4-xF_x and Nd_2-xCe_xCuO₄ systems

C. H. Chen, D. J. Werder, A. C.W.P. James, D. W. Murphy, S. Zahurak, R. M. Fleming, B. Batlogg, L. F. Schneemeyer

Chemistry and Biochemistry

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Abstract

We have observed a periodic superlattice modulation in Nd₂CuO₄ and in the "electron-doped" Nd₂CuO_4-xF_x and Nd_2-xCe_x-CuO₄ by electron diffraction and microscopy. The superlattice modulation characterized by a wave vector q=( 1 4 1 4,0) parallel to the Cu-O plane was found in both superconducting and non-superconducting samples, but most of the samples examined were not homogeneous with respect to the superlattice. The orthorhombic superlattice phase is found to exist in four possible variants with its c-axis parallel to the four equivalent [111] zone-axes in the underlying tetragonal lattice. Samples quenched from high temperature invariably showed no superlattice or superconductivity; bulk superconductivity and regions of superlattice were observed on annealing in the range 250-750°C. We believe that oxygen migration is responsible for this disproportionation into superlattice and nonsuperlattice regions.

Original language	English
Pages (from-to)	375-380
Number of pages	6
Journal	Physica C: Superconductivity and its applications
Volume	160
Issue number	3-4
DOIs	https://doi.org/10.1016/0921-4534(89)90078-6
State	Published - 15 Sep 1989

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title = "Superlattice modulation and superconductivity in the electron-doped Nd2CuO4-xFx and Nd2-xCexCuO4 systems",

abstract = "We have observed a periodic superlattice modulation in Nd2CuO4 and in the {"}electron-doped{"} Nd2CuO4-xFx and Nd2-xCex-CuO4 by electron diffraction and microscopy. The superlattice modulation characterized by a wave vector q=( 1 4 1 4,0) parallel to the Cu-O plane was found in both superconducting and non-superconducting samples, but most of the samples examined were not homogeneous with respect to the superlattice. The orthorhombic superlattice phase is found to exist in four possible variants with its c-axis parallel to the four equivalent [111] zone-axes in the underlying tetragonal lattice. Samples quenched from high temperature invariably showed no superlattice or superconductivity; bulk superconductivity and regions of superlattice were observed on annealing in the range 250-750°C. We believe that oxygen migration is responsible for this disproportionation into superlattice and nonsuperlattice regions.",

author = "Chen, {C. H.} and Werder, {D. J.} and James, {A. C.W.P.} and Murphy, {D. W.} and S. Zahurak and Fleming, {R. M.} and B. Batlogg and Schneemeyer, {L. F.}",

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T1 - Superlattice modulation and superconductivity in the electron-doped Nd2CuO4-xFx and Nd2-xCexCuO4 systems

AU - Chen, C. H.

AU - Werder, D. J.

AU - James, A. C.W.P.

AU - Murphy, D. W.

AU - Zahurak, S.

AU - Fleming, R. M.

AU - Batlogg, B.

AU - Schneemeyer, L. F.

PY - 1989/9/15

Y1 - 1989/9/15

N2 - We have observed a periodic superlattice modulation in Nd2CuO4 and in the "electron-doped" Nd2CuO4-xFx and Nd2-xCex-CuO4 by electron diffraction and microscopy. The superlattice modulation characterized by a wave vector q=( 1 4 1 4,0) parallel to the Cu-O plane was found in both superconducting and non-superconducting samples, but most of the samples examined were not homogeneous with respect to the superlattice. The orthorhombic superlattice phase is found to exist in four possible variants with its c-axis parallel to the four equivalent [111] zone-axes in the underlying tetragonal lattice. Samples quenched from high temperature invariably showed no superlattice or superconductivity; bulk superconductivity and regions of superlattice were observed on annealing in the range 250-750°C. We believe that oxygen migration is responsible for this disproportionation into superlattice and nonsuperlattice regions.

AB - We have observed a periodic superlattice modulation in Nd2CuO4 and in the "electron-doped" Nd2CuO4-xFx and Nd2-xCex-CuO4 by electron diffraction and microscopy. The superlattice modulation characterized by a wave vector q=( 1 4 1 4,0) parallel to the Cu-O plane was found in both superconducting and non-superconducting samples, but most of the samples examined were not homogeneous with respect to the superlattice. The orthorhombic superlattice phase is found to exist in four possible variants with its c-axis parallel to the four equivalent [111] zone-axes in the underlying tetragonal lattice. Samples quenched from high temperature invariably showed no superlattice or superconductivity; bulk superconductivity and regions of superlattice were observed on annealing in the range 250-750°C. We believe that oxygen migration is responsible for this disproportionation into superlattice and nonsuperlattice regions.

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JO - Physica C: Superconductivity and its Applications

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IS - 3-4

ER -

Superlattice modulation and superconductivity in the electron-doped Nd₂CuO_4-xF_x and Nd_2-xCe_xCuO₄ systems

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