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

M. Matsuda, G. E. Granroth, M. Fujita, K. Yamada, and J. M. Tranquada
Phys. Rev. B 87, 054508 – Published 21 February 2013

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 [Phys. Rev. Lett. 101, 197001 (2008)]. 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 YBa2Cu3O6+x. We discuss the significance of these results.

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  • Received 31 January 2013

DOI:https://doi.org/10.1103/PhysRevB.87.054508

©2013 American Physical Society

Authors & Affiliations

M. Matsuda and G. E. Granroth

  • Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

M. Fujita

  • Institute for Materials Research, Tohoku University, Katahira, Sendai 980-8577, Japan

K. Yamada

  • Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan

J. M. Tranquada

  • Condensed Matter Physics & Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA

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Issue

Vol. 87, Iss. 5 — 1 February 2013

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