Quantum Energy Gap in the S=1 Heisenberg Antiferromagnet NENP: Experimental Data and Haldane Conjecture

  • J. P. Renard
  • M. Verdaguer
  • L. P. Regnault
  • W. A. C. Erkelens
  • J. Rossat-Mignod
  • W. G. Stirling
Part of the NATO ASI Series book series (NSSB, volume 168)


Since the early work of Ising [1], a lot of theoretical studies have been devoted to one-dimensional (1d) magnetism [2–6]. Recently, the interest for the 1d Heisenberg antiferromagnets (1d-HAF) with integer spin values has been renewed by Haldane [7] who predicted for these systems, an energy gap between the singlet ground state and the first excited states.


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Copyright information

© Springer Science+Business Media New York 1987

Authors and Affiliations

  • J. P. Renard
    • 1
  • M. Verdaguer
    • 2
  • L. P. Regnault
    • 3
  • W. A. C. Erkelens
    • 3
    • 5
  • J. Rossat-Mignod
    • 3
  • W. G. Stirling
    • 4
  1. 1.Institut d’Electronique Fondamentale, CNRS UA 022Université Paris-SudOrsayFrance
  2. 2.Laboratoire de Spectrochimie des éléments de transition, CNRS UA 420Université Paris-SudOrsayFrance
  3. 3.Centre d’Etudes Nucléaires de GrenobleDRF/SPh-MDNGrenoble, CedexFrance
  4. 4.Institut Laue LangevinGrenoble, CedexFrance
  5. 5.Kamerlingh Onnes LaboratoryUniversity of LeidenThe Netherlands

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