μSR study on the 2D S=1 Kagomé organic antiferromagnet, m-MPYNN·(BF4,ClO4)

Muon-spin relaxation (μSR) measurements were applied to the two-dimensional Kagome organic antiferromagnet, m-MPYNN·(BF4)0.9(ClO4)0.1, to study the ground state of dimer spins with S=1. No big change was observed in μSR time spectra down to 30 mK, although a magnetically ordered state of the dimer spins is predicted below about 100 mK from the susceptibility measurement. Possible magnetic states of the dimer spins are discussed.