Magnetic order, spin correlations, and superconductivity in single-crystal Nd1.85Ce0.15CuO4+δ
M. Matsuda, Y. Endoh, K. Yamada, H. Kojima, I. Tanaka, R. J. Birgeneau, M. A. Kastner, G. Shirane
DOI 10.1103/PhysRevB.45.12548 · Physical Review B
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Abstract
Measurements are reported of the static, instantaneous, and dynamic spin correlations in single crystals of Nd1.85Ce0.15CuO4+δ. The as-grown crystals show antiferromagnetic long-range order. However, the Néel temperatures and spin-stiffness constants are greatly reduced from their respective values in Nd2CuO4+δ. After reduction and annealing, the crystals superconduct with Tc=23 K, but inclusions of the antiferromagnetic phase, albeit with reduced Néel temperatures, are always present. Based on these data, we suggest that the disorder due to excess oxygen in as-grown samples stabilizes the magnetic correlations. This leads to a speculative model for the effects of deoxygenation in which the removal of the excess oxygen causes the magnetic correlations to diminish and hence superconductivity to become possible.
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. | 23 | Pressure not reported | unknown |
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