Nuclear Magnetic Relaxation in the Haldane-Gap Antiferromagnet Ni(C2H8N2)2NO2(ClO4)
Abstract
A new theory is proposed to interpret nuclear spin-lattice relaxation-time (T1) measurements on the spin-1 quasi-one-dimensional Heisenberg antiferromagnet Ni(C2H8N2)2NO2(ClO4) (NENP). While Sagi and Affleck pioneeringly discussed this subject in terms of field-theoretical languages, there is no theoretical attempt yet to explicitly simulate the novel observations of 1/T1 reported by Fujiwara et al.. By means of modified spin waves, we solve the minimum of 1/T1 as a function of an applied field, pending for the past decade.
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