2024/11/29 by Li, Shuo, Wu, Zhanlong, Wang, Yanhong +12
#FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el)
paper · doi:10.48550/arxiv.2411.19538
We performed single-crystal magnetic susceptibility and 1H NMR measurements on a quasi-1D, spin-1 antiferromagnet NiC2O4⋅2NH3, with temperature down to 100 mK and with field up to 26 T. With field applied along the chain direction (crystalline b direction), a spin gap is determined at low fields. Our susceptibility and spin-lattice relaxation measurements reveal a Haldane phase at low field, with an intrachain exchange coupling J ≈ 35 K and an easy-plane single-ion anisotropy of 17 K. A field-induced antiferromagnetic (AFM) ordering emerges at fields of 2.1 T, which sets a three-dimensional (3D) quantum critical point (QCP). The high-temperature spin-lattice relaxation rates 1/T1 resolves an onset of Tomonaga-Luttinger liquid behavior at field above 3.5 T, which characterizes a hidden 1D QCP.