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.
| 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 | |
| State | Published - 15 Sep 1989 |
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Superlattice modulation and superconductivity in the electron-doped Nd2CuO4-xFx and Nd2-xCexCuO4 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
TY - JOUR
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.
UR - http://www.scopus.com/inward/record.url?scp=0024733297&partnerID=8YFLogxK
U2 - 10.1016/0921-4534(89)90078-6
DO - 10.1016/0921-4534(89)90078-6
M3 - Article
AN - SCOPUS:0024733297
VL - 160
SP - 375
EP - 380
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
SN - 0921-4534
IS - 3-4
ER -