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, Lynn Schneemeyer

Research output: Contribution to journalArticleResearchpeer-review

49 Citations (Scopus)

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 languageEnglish
Pages (from-to)375-380
Number of pages6
JournalPhysica C: Superconductivity and its applications
Volume160
Issue number3-4
DOIs
StatePublished - 15 Sep 1989

Fingerprint

Superconductivity
superconductivity
Modulation
modulation
Electrons
Electron diffraction
Electron microscopy
electrons
Annealing
Oxygen
electron microscopy
electron diffraction
annealing
oxygen
Temperature

Cite this

Chen, C. H. ; Werder, D. J. ; James, A. C.W.P. ; Murphy, D. W. ; Zahurak, S. ; Fleming, R. M. ; Batlogg, B. ; Schneemeyer, Lynn. / Superlattice modulation and superconductivity in the electron-doped Nd2CuO4-xFx and Nd2-xCexCuO4 systems. In: Physica C: Superconductivity and its applications. 1989 ; Vol. 160, No. 3-4. pp. 375-380.
@article{b4ac263aba8e42038abf4fb5ab7043fe,
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 Lynn Schneemeyer",
year = "1989",
month = "9",
day = "15",
doi = "10.1016/0921-4534(89)90078-6",
language = "English",
volume = "160",
pages = "375--380",
journal = "Physica C: Superconductivity and its Applications",
issn = "0921-4534",
publisher = "Elsevier",
number = "3-4",

}

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, Lynn.

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

Research output: Contribution to journalArticleResearchpeer-review

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, Lynn

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

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 -