Magnetic order, spin correlations, and superconductivity in single-crystal Nd1.85Ce0.15CuO4+

M. Matsuda, Y. Endoh, K. Yamada, H. Kojima, I. Tanaka, R. J. Birgeneau, M. A. Kastner, G. Shirane

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Abstract

Measurements are reported of the static, instantaneous, and dynamic spin correlations in single crystals of Nd1.85Ce0.15CuO4+. 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+. 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.

Original languageEnglish
Pages (from-to)12548-12555
Number of pages8
JournalPhysical Review B
Volume45
Issue number21
DOIs
StatePublished - 1992
Externally publishedYes

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