Temperature dependent 89Y NMR study on multiferroic YCrO3

• Published in: Journal of physics. Condensed matter Vol. 33; no. 12
• Main Authors: Mall, Ashish Kumar, Pramanik, A K
• Format: Journal Article
• Language: English
• Published: IOP Publishing 23.03.2021
• Subjects: magnetic order; nuclear magnetic resonance; relaxation
• ISSN: 0953-8984; 1361-648X
• DOI: 10.1088/1361-648X/abd8b7

In this manuscript, we report the 89Y NMR measurement as a function of temperature on single phase and pure polycrystalline YCrO3 sample to study the magnetism and relaxation times on a microscopic level across the magnetic transition (TN ≃ 141 K) from paramagnetic to antiferromagnetic state. The NMR peak width broadens abruptly upon crossing TN due 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 approaching TN from 300 K. There is also a significant increase in peak width. The temperature dependence of the 89Y NMR spin-lattice relaxation rates 1/T1 indicates a phase transition at TN which is of magnetic origin due to Cr3+ ions, with an anomalously rise of fluctuations below TN. Above TN, this spin-lattice relaxation rate can be fitted to a power-law scaling behavior 1/T1 ∼ Tβ with an exponent factor β ≈ 0.8, indicates low energy spin fluctuations. Moreover, Knight shift and 1/TT1 scales linear with the bulk susceptibility which suggests the antiferromagnetic spin fluctuation in the YCrO3 system.