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Opening of a gap in an inhomogeneous external field

  • A. Fledderjohann
  • M. Karbach
  • K.-H. Mütter

Abstract:

We study the one-dimensional spin-1/2 antiferromagnetic Heisenberg model exposed to an external field, which is a superposition of a homogeneous field h3 and a small periodic field of strength h1. For the case of a transverse staggered field a gap opens, which scales with \(\), where \(\) is given by the critical exponent \(\) defined through the transverse structure factor of the model at h 1 =0. For the case of a longitudinal periodic field with wave vector \(\) and strength hq a plateau is found in the magnetization curve at M=1/4. The difference of the upper- and lower magnetic field scales with \(\), where \(\) is given by the critical exponent \(\) defined through the longitudinal structure factor of the model at h q =0.

PACS. 75.10 -b General theory and models of magnetic ordering 

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Copyright information

© EDP Sciences, Springer-Verlag 1999

Authors and Affiliations

  • A. Fledderjohann
    • 1
  • M. Karbach
    • 1
  • K.-H. Mütter
    • 1
  1. 1.Physics Department, University of Wuppertal, 42097 Wuppertal, GermanyDE

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