Abstract
Muon spin relaxation (µ + SR) measurements were performed on a S = 1 of composite Haldane spin chains in IPA-CuCl 3 , which consists of a spin-ladder network along the a -axis. At a zero external magnetic field, the µ + spin relaxation became slightly faster with the development of a magnetic short-range order, but, as expected, oscillating spectra, which indicate a magnetic long-range order, did not appear. From the µ + SR time spectra under transverse and longitudinal magnetic fields, fluctuation of the local field whose frequency was estimated to be 99 ±12 MHz was observed at 2.0 K, but it disappeared at 12 and 50 K. The appearance of the local field at a temperature between 12 and 2.0 K may suggest experimental evidence of the crossover from S = 1/2 spin state to S = 1 of composite Haldane spin state with decreasing temperature.
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