Static and dynamic spin correlations in the spin-glass phase of slightly doped La2-xSrxCuO4

M. Matsuda, M. Fujita, K. Yamada, R. J. Birgeneau, M. A. Kastner, H. Hiraka, Y. Endoh, S. Wakimoto, G. Shirane

Research output: Contribution to journalArticlepeer-review

178 Citations (Scopus)

Abstract

Neutron-scattering experiments reveal that a diagonal spin modulation, which is a one-dimensional modulation rotated away by 45° from that in the superconducting phase, occurs universally across the insulating spin-glass phase in La2-xSrxCuO4 (0.02≤x≤0.055). This establishes an intimate relation between the magnetism and the transport properties in the high-temperature copper oxide superconductors. Furthermore, it is found that the charge density per unit length estimated using a charge stripe model is almost constant throughout the phase diagram, even when the modulation rotates away by 45° at the superconducting boundary. However, at the lowest values for x the density changes approaching 1 hole/Cu as in La2-xSrxNiO4. Magnetic excitation spectra suggest that magnetic correlations change from incommensurate to commensurate at ω ∼7 meV and T∼70 K, indicating a characteristic energy for the incommensurate structure of 6-7 meV.

Original languageEnglish
Pages (from-to)9148-9154
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume62
Issue number13
DOIs
Publication statusPublished - 2000 Oct 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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