1995/12/22 by Sagi, Jacob S.
#Condensed Matter (cond-mat) #FOS: Physical sciences
paper · doi:10.48550/arxiv.cond-mat/9512161
A comprehensive theory of nuclear magnetic relaxation is developed for Haldane Gap materials using nonlinear sigma, boson and fermion models. We include a thorough discussion of of the effects of interchain couplings, nearest neighbour hyperfine couplings and crystal structure. We also introduce a new theory of impurities corresponding to broken chain ends weakly coupled to bulk magnons. The work is compared to recent experiments on NENP.