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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Chen, C. H., Werder, D. J., James, A. C. W. P., Murphy, D. W., Zahurak, S., Fleming, R. M., Batlogg, B., & Schneemeyer, L. F. (1989). Superlattice modulation and superconductivity in the electron-doped Nd₂CuO_4-xF_x and Nd_2-xCe_xCuO₄ systems. Physica C: Superconductivity and its applications, 160(3-4), 375-380. https://doi.org/10.1016/0921-4534(89)90078-6

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Superlattice modulation and superconductivity in the electron-doped Nd₂CuO_4-xF_x and Nd_2-xCe_xCuO₄ systems. / Chen, C. H.; Werder, D. J.; James, A. C.W.P.; Murphy, D. W.; Zahurak, S.; Fleming, R. M.; Batlogg, B.; Schneemeyer, L. F.

In: Physica C: Superconductivity and its applications, Vol. 160, No. 3-4, 15.09.1989, p. 375-380.

Research output: Contribution to journal › Article

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AU - Chen, C. H.

AU - Werder, D. J.

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

AU - Murphy, D. W.

AU - Zahurak, S.

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AU - Batlogg, B.

AU - Schneemeyer, L. F.

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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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