Temperature dependentY NMR study on multiferroic YCrO.

In this manuscript, we report theY NMR measurement as a function of temperature on single phase and pure polycrystalline YCrOsample to study the magnetism and relaxation times on a microscopic level across the magnetic transition (≃ 141 K) from paramagnetic to antiferromagnetic state. The NMR peak width broadens abruptly upon crossingdue to the onset of internal magnetic fields, while peakshift slight decreases. A slight increase and subsequent anomalous decrease in the NMR peak intensity is observed on approachingfrom 300 K. There is also a significant increase in peak width. The temperature dependence of theY NMR spin-lattice relaxation rates 1/indicates a phase transition atwhich is of magnetic origin due to Crions, with an anomalously rise of fluctuations below. Above, this spin-lattice relaxation rate can be fitted to a power-law scaling behavior 1/∼with an exponent factor≈ 0.8, indicates low energy spin fluctuations. Moreover, Knight shift and 1/scales linear with the bulk susceptibility which suggests the antiferromagnetic spin fluctuation in the YCrOsystem.