Magnetic Correlations in La2xSrxCoO4 Studied by Neutron Scattering: Possible Evidence for Stripe Phases

M. Cwik, M. Benomar, T. Finger, Y. Sidis, D. Senff, M. Reuther, T. Lorenz, and M. Braden
Phys. Rev. Lett. 102, 057201 – Published 2 February 2009

Abstract

Spin correlations in La2xSrxCoO4 (0.3x0.6) have been studied by neutron scattering. The commensurate antiferromagnetic order of La2CoO4 persists in a very short range up to a Sr content of x=0.3, whereas small amounts of Sr suppress commensurate antiferromagnetism in cuprates and in nickelates. La2xSrxCoO4 with x>0.3 exhibits incommensurate spin ordering with the modulation closely following the amount of doping. These incommensurate phases strongly resemble the stripe phases observed in cuprates and nickelates, but incommensurate magnetic ordering appears only at larger Sr content in the cobaltates due to a reduced charge mobility.

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  • Received 20 March 2008

DOI:https://doi.org/10.1103/PhysRevLett.102.057201

©2009 American Physical Society

Authors & Affiliations

M. Cwik1, M. Benomar1, T. Finger1, Y. Sidis2, D. Senff1, M. Reuther1, T. Lorenz1, and M. Braden1,*

  • 1II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
  • 2Laboratoire Léon Brillouin, C.E.A./C.N.R.S., F-91191 Gif-sur-Yvette CEDEX, France

  • *braden@ph2.uni-koeln.de

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Vol. 102, Iss. 5 — 6 February 2009

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