Spin Correlations in Electron-Doped High-T^sub c^ Superconductor

• Published in: Journal of the Physical Society of Japan 2011-01, Vol.80, p.1
• Main Authors: Fujita, Masaki, Shigiya, Kosuke, Kaminaga, Junya, Nakagawa, Masaaki, Enoki, Masanori, Yamada, Kazuyoshi
• Format: Article
• Language: English
• Subjects: Correlation analysis; Electrons; Experiments; Scattering; Superconductivity; Superconductors
• ISSN: 0031-9015; 1347-4073

The interplay between the magnetism and the high- T ... superconductivity is one of the central issues for elucidating the pairing mechanism. For the hole-doped system it is now established that the spin fluctuations closely correlate with the superconductivity. Although the comparable study for hole- and electron-doped system is indispensable for the unified understanding of high- T ... mechanism, many key experiments have been lacking for the electron-doped system. This is possibly due to the difficulty in preparing high-quality single crystal. Therefore, the universal magnetic properties of high- T ... cuprates irrespective of the type of carriers are still controversial. To make a progress in the study of spin correlation in the electron-doped system, we have carried out a comprehensive neutron-scattering experiment on Pr ... LaCe ... CuO ... , of which single crystal was successfully grown in our group for the first time. In this paper, we present the results of neutron-scattering study on the spin fluctuations as a function of doping and energy transfer. The degradation of doping evolution of low-energy spin fluctuations in the superconducting phase and the characteristic dual nature of spin excitation spectrum in the optimally and overdoped samples are introduced. (ProQuest: ... denotes formulae/symbols omitted.)