Spin correlations in electron-doped high-T c superconductor

Masaki Fujita, Kosuke Shigiya, Junya Kaminaga, Masaaki Nakagawa, Masanori Enoki, Kazuyoshi Yamada

Research output: Contribution to journalArticle

Abstract

The interplay between the magnetism and the high-T c 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 c 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 c 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 1-xLaCe xCuO 4, 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.

Original languageEnglish
Article numberSB029
Journaljournal of the physical society of japan
Volume80
Issue numberSUPPL. B
DOIs
Publication statusPublished - 2011 Dec 1

Keywords

  • Electron-dope high-T superconductor
  • Neutron-scattering measurements
  • Spin correlations

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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