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High-field spin dynamics of antiferromagnetic quantum spin chains

Authors
Journal
Physica B Condensed Matter
0921-4526
Publisher
Elsevier
Publication Date
Identifiers
DOI: 10.1016/s0921-4526(99)01737-8
Keywords
  • One-Dimensional Systems
  • Haldane Gap
  • Peierls Transition
  • Antiferromagnets
Disciplines
  • Physics

Abstract

Abstract The characteristic internal order of macroscopic quantum ground states in one-dimensional spin systems is usually not directly accessible, but reflected in the spin dynamics and the field dependence of the magnetic excitations. In high magnetic fields quantum phase transitions are expected. We present recent work on the high-field spin dynamics of the S=1 antiferromagnetic Heisenberg chains NENP (Haldane ground state) and CsNiCl 3 (quasi-1D HAF close to the quantum critical point), the uniform S= 1 2 chain CTS, and the spin-Peierls system CuGeO 3.

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