Abstract
The unique singlet ground state of an S =1 one-dimensional antiferromagnet is studied using the ESR measurements on NENP, Ni(C 2 H 8 N 2 ) 2 NO 2 (ClO 4 ). The pure crystal is ESR insentitive in its ground state, reflecting a nonmagnetic nature of the Haldane state. The addition of the nonmagnetic Zn 2+ impurities, however, makes the system ESR sensitive, giving an angle-dependent ESR spectrum. A new interpretation is proposed that the observed signals are due to the S =1/2 broken valence bond which is subjected to the field-induced staggered internal fields originating from the underlying antiferromagnetic polarization.
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