Structure and oxygen stoichiometry for the electron-doped cuprate superconductor Nd1.85Ce0.15CuO4−δ
G. H. Kwei, S-W. Cheong, Z. Fisk, F. H. Garzon, J. A. Goldstone, J. D. Thompson
DOI 10.1103/PhysRevB.40.9370 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We have determined the structure of the newly discovered electron-doped superconductor Nd1.85Ce0.15CuO4−δ at 11 and 300 K using high-resolution neutron-powder-diffraction techniques. Both nonsuperconducting oxygenated and superconducting Zr-gettered (Tc=24 K with shielding and Meissner fractions of 30 and 16% at 5 K, respectively) samples were investigated to study the effect of Zr gettering on the crystal structure and oxygen stoichiometry. We find that the structure remains tetragonal (I4/mmm), with no evidence for Nd/Ce ordering, for both samples at both temperatures. Structure and oxygen stoichiometry of the oxygenated and Zr-gettered samples remain remarkably similar at both temperatures, the only difference being a slight decrease (but greater than three standard deviations) in the thermal parameters of the rare-earth ions along the c axis for the superconducting sample. Thermogravimetric analyses confirm the oxygen stoichiometry determined from the structural refinements.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nd1.85Ce0.15CuO4-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 24 | Pressure not reported | onset |
Similar papers
Effect of Ce doping on the Cu charge in the electron superconductor Nd2−xCexCuO4
similarity 0.96E. E. Alp et al.
Source status unknown — claims are unverified
Momentum Dependence of Charge Excitations in the Electron-Doped Superconductor Nd1.85Ce0.15CuO4: A Resonant Inelastic X-Ray Scattering Study
similarity 0.95K. Ishii et al.
Source status unknown — claims are unverified
Angle-Resolved Photoemission Spectroscopy of Electron-Doped Cuprate Superconductors: Isotropic Electron-Phonon Coupling
similarity 0.95Seung Ryong Park et al.
Source status unknown — claims are unverified
Macroscopic evidence for quantum criticality and field-induced quantum fluctuations in cuprate superconductors
similarity 0.95A. D. Beyer et al.
Source status unknown — claims are unverified
Time-Resolved Optical Reflectivity of the Electron-Doped Nd2−xCexCuO4+δ Cuprate Superconductor: Evidence for an Interplay between Competing Orders
similarity 0.94J. P. Hinton et al.
Source status unknown — claims are unverified
Magnetic order, spin correlations, and superconductivity in single-crystal Nd1.85Ce0.15CuO4+δ
similarity 0.94M. Matsuda et al.
Source status unknown — claims are unverified