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Magnetic Fluctuations and Excitations in the S=1 Antiferromagnetic Chains of NENP

  • L. P. Regnault
  • W. A. C. Erkelens
  • J. Rossat-Mignod
  • J. P. Renard
  • M. Verdaguer
  • W. G. Stirling
  • C. Vettier
Part of the Springer Proceedings in Physics book series (SPPHY, volume 23)

Abstract

In this paper we report experimental results concerning the magnetic properties of the S = 1 antiferromagnetic chain, as observed in the new system Ni (en)2N02C104 (alias NENP). Conventional ideas on the ground state properties of antiferromagnetic quantum chains have been recently challenged by HALDANE /1/. According to his theory, the S = 1 Heisenberg antiferromagnetic chain (1D-HAF) would exhibit an energy gap between a non-magnetic singlet ground state and the first excited states, in sharp contrast with the S = 1/2 1D-HAF which exhibits a continuum of excited states /2/. Such a difference between integer and half integer spins has been more clearly verified by numerical calculations /3,4,5/. The best evaluations agree with a rather large value of the energy gap EG ∼ O.4∣J∣ for the case S = 1 /5/. However, the existence of the Haldane gap would affect largely the magnetic properties. The most characteristic features would be an exponential decrease of all the susceptibilities when T ≲ EG/k, and the absence of long-range ordering (LRO) down to very low temperature, due to the finite size of the correlation length /1,3/. unfortunately, the existence of such properties is not a unique signature of the Haldane conjecture. Indeed, similar effects are predicted and observed in the S = ½ alternating chain /6,7/ as in the S = ½ spin-Peierls system /8,9/. This makes more difficult to obtain an unambiguous description of the experimental results.

Keywords

Field Dependence Inelastic Neutron Scatter Magnetic Fluctuation Interchain Coupling Unambiguous Description 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1987

Authors and Affiliations

  • L. P. Regnault
    • 1
  • W. A. C. Erkelens
    • 1
  • J. Rossat-Mignod
    • 1
  • J. P. Renard
    • 2
  • M. Verdaguer
    • 3
  • W. G. Stirling
    • 4
  • C. Vettier
    • 4
  1. 1.Centre d’Etudes NucléairesDRF-G/SPh-MDN, 85 XGrenoble CedexFrance
  2. 2.Institut d’Electronique FondamentaleUniversité Paris IXOrsay CedexFrance
  3. 3.CNRS (UA 420)Université Paris-SudOrsay CedexFrance
  4. 4.Institut Laue-Langevin, 156 XGrenoble CedexFrance

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