Abstract
High-field ESR measurements of Cu[2-(2-aminomethyl)pyridine]Br 2 (Cu(ampy)Br 2) powder sample, which is a model substance of the S = 1 2 one-dimensional Heisenberg antiferromagnet (1DHAF) with a frustration, have been performed in the frequency region from 40 to 480 GHz using the pulsed magnetic field up to 16 T. The obtained g-values are g / / = 2.06 and g ⊥=2.06, which suggest that the orbital ground state of Cu 2+ in Cu(ampy)Br 2 is the x 2– y 2 orbital state. Distinct frequency dependent g-shift is observed below 4.2 K from the temperature dependence measurements. The possibility of the phase transition below 4.2 K is discussed from the frequency dependence results at 1.7 and 4.2 K.
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