Abstract

We have performed electron spin resonance (ESR) measurements on the S=1 quasi-one-dimensional Heisenberg antiferromagnet, Ni(C5H14N2)2N3(PF6) in the field induced long range ordered (LRO) phase. From the ESR experiments, two branches are observed, one of which is assigned to an antiferromagnetic resonance mode and the other to a one-dimensional excitation that persists in the LRO phase.

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