Abstract
The magnetic properties of Cu(NH 3) 4(NO 3) 2 have been measured at low temperatures. Broad maxima in both the susceptibility and specific heat are observed and are consistent with linear chain behavior of a Heisenberg antiferromagnet, with J/k = 3.9 ± 0.1 K. Long-range order sets in at T c = 0.15 ± 0.01 K, and the ratio kT c/| J| = 0.038 is the lowest observed as yet for a one-dimensional, S = 1 2 antiferromagnet.
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