Energy-dependent crossover from anisotropic to isotropic magnetic dispersion in lightly doped La1.96Sr0.04CuO4

M. Matsuda, G. E. Granroth, 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 La1.96Sr0.04CuO4, which shows diagonal incommensurate spin correlations at low temperatures. We previously reported that this crystal, with a single orthorhombic domain, exhibits the "hourglass" dispersion at low energies. In this paper, we investigate in detail the energy evolution of the magnetic excitations up to 65 meV. It is found that the anisotropic excitations at low energies, dispersing only along the spin modulation direction, cross over to an isotropic, conical dispersion that resembles spin waves in the parent compound La2CuO4. The change from twofold to full symmetry on crossing the waist of the hourglass reproduces behavior first identified in studies of underdoped YBa 2Cu3O6+x. We discuss the significance of these results.

Original languageEnglish
Article number054508
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume87
Issue number5
DOIs
Publication statusPublished - 2013 Feb 21

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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