Zeeman levels with exotic field dependence in the high field phase of a S=1 Heisenberg antiferromagnetic chain

Details Zeeman levels with exotic field dependence in the high field phase of a S=1 Heisenberg antiferromagnetic chain Zeeman levels with exotic field dependence in the high field phase of a S=1 Heisenberg antiferromagnetic chain

2003-04-10

arxiv.org/abs/cond-mat/0304234v2

Physics

Condensed Matter

Strongly Correlated Electrons

4 revtex pages, 3 eps figures included

Scientific paper

10.1103/PhysRevLett.91.177601

We have performed electron spin resonance measurements over a wide frequency and magnetic field range on a single crystal of the S=1 quasi-one-dimensional Heisenberg antiferromagnet $\rm Ni(C_5H_{14}N_2)_2N_3(PF_6)$. We observed gapped excitation branches above the critical field ($H_{\rm c}$) where the Haldane gap closes. These branches are analyzed by a phenomenological field-theory using complex-field $\phi^{4}$ model. A satisfactory agreement between experiment and theory is obtained.

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