Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/25063
Title: Quantum energy gap in two quasi-one-dimensional S=1 Heisenberg antiferromagnets
Author: Renard, J. P.
Verdaguer, Michel
Regnault, L. P.
Erkelens, W. A. C.
Rossat-Mignod, J.
Ribas Gispert, Joan
Stirling, W. G.
Vettier, C.
Keywords: Electrònica
Propietats magnètiques
Anisotropia
Electronics
Magnetic properties
Anisotropy
Issue Date: 1988
Publisher: American Institute of Physics
Abstract: Following the Haldane conjecture, the antiferromagnetic (AF) Heisenberg chain of integer spins has a singlet ground state separated from the excited states by an energy gap. Recent numerical calculations on finite AF chains with S=1 supported this conjecture and provided an approximate value for the energy gap:E G ≂0.4‖ J‖, where J is the intrachain exchange interaction. We report experimental studies on two Ni (II) quasi‐one‐dimensional (1D) AF with large intrachain interaction, J/k≂−50 K, Ni(C2H8N2)2NO2(ClO4) (NENP) and Ni(C3H1 0N2)2NO2(ClO4), (NINO). In both compounds, the magnetic susceptibility along the three crystal axes steeply decreases below T≂15 K and no 3D long‐range magnetic order could be detected down to 1.2 K. These features are consistent with the Haldane conjecture. Inelastic neutron scattering experiments performed on NENP show two energy gaps, with an average value of about 0.4‖ J‖, which are explained by a splitting of the Haldane gap by single‐ion anisotropy.
Note: Reproducció del document publicat a: http://dx.doi.org/10.1063/1.340736
It is part of: Journal of Applied Physics, 1988, vol. 63, núm. 8, p. 3538-3542
Related resource: http://dx.doi.org/10.1063/1.340736
URI: http://hdl.handle.net/2445/25063
ISSN: 0021-8979
Appears in Collections:Articles publicats en revistes (Química Inorgànica i Orgànica)

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