Macroscopic and local magnetic moments in Si-doped CuGeO3 as determined by neutron and μSR studies

  • F. Semadeni
  • A. Amato
  • B. Roessli
  • P. Böni
  • C. Baines
  • T. Masuda
  • K. Uchinokura
  • G. Shirane

Abstract:

The temperature-concentration phase diagram of the Si-doped spin-Peierls compound CuGeO3 is investigated by means of neutron scattering and muon spin rotation spectroscopy in order to determine the microscopic distribution of the magnetic and lattice dimerised regions as a function of doping. The analysis of the zero-field muon spectra has confirmed the spatial inhomogeneity of the staggered magnetisation that characterises the antiferromagnetic superlattice peaks observed with neutrons. In addition, the variation of the macroscopic order parameter with doping can be understood by considering the evolution of the local magnetic moment as well as of the various regions contributing to the muon signal.

PACS. 75.30.Kz Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.) – 76.75.+i Muon spin rotation and relaxation – 75.25.+z Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source X-ray scattering, etc.) 

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Copyright information

© EDP Sciences, Springer-Verlag 2001

Authors and Affiliations

  • F. Semadeni
    • 1
  • A. Amato
    • 2
  • B. Roessli
    • 1
  • P. Böni
    • 3
  • C. Baines
    • 2
  • T. Masuda
    • 4
  • K. Uchinokura
    • 4
  • G. Shirane
    • 5
  1. 1.Laboratory for Neutron Scattering, ETH-Zürich & PSI, 5232 Villigen PSI, SwitzerlandCH
  2. 2.Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen PSI, SwitzerlandCH
  3. 3.Physik Department E21, Technische Universität München, 85747 Garching, GermanyDE
  4. 4.Department of Advanced Materials Science, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, JapanJP
  5. 5.Department of Physics, Brookhaven National Laboratory, Upton, New York 11973-5000, USAUS

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