Abstract
Abstract The organic radical salt m-MPYNN·BF4 is characterized as a spin-1 kagome antiferromagnet and has been suggested to have a singlet ground state with a finite spin gap. 1 H -NMR measurements for this salt have been carried out in the temperature range down to 0.05 K and under the magnetic fields up to 70 kOe . It is found that nuclear spin–lattice relaxation rate T1−1 increases with decreasing temperature below about 1 K under magnetic fields below about 8 kOe . Further, a gapped magnetic state is found at higher fields. Our results are interesting from the viewpoint of the crossover between gapless and gapped regimes, which has been studied intensively for quasi-1D spin-gap systems.
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