Detailed structure of the low-energy magnetic dispersion of the diagonal incommensurate phase in La1.975Sr0.025CuO4

M. Matsuda, J. A. Fernandez-Baca, M. Fujita, K. Yamada, J. M. Tranquada

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6 Citations (Scopus)

Abstract

Inelastic neutron scattering experiments have been performed on lightly doped La1.975Sr0.025CuO4, which contains a hole concentration slightly higher than the critical concentration for three-dimensional long-range antiferromagnetic order. We previously found that the magnetic excitation spectrum in the insulating phase with a diagonal incommensurate spin modulation has similarities to that in the superconducting regime, where the spin modulation is bond parallel. In this study, we investigate the excitations in detail around Ecross, at which the excitations become most nearly commensurate. It is found that both the magnitude and the anisotropy of the momentum width of the excitations change abruptly at Ecross. Our experimental results suggest that the magnetic excitations rising from the pair of (diagonally) incommensurate wave vectors merge at Ecross into isotropic excitations.

Original languageEnglish
Article number104524
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume84
Issue number10
DOIs
Publication statusPublished - 2011 Sep 30

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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