Magnetic and thermal properties of a new quasi-one-dimensional S = 1 chain compound

Since Haldane predicted that the ground state of one-dimensional Heisenberg antiferromagnet has a finite spin gap for integer spins, while gapless excitations for half-odd integer spins, lots of theoretical and experimental studies have been inspired on low-dimensional quantum magnets. Several quasi-one-dimensional S = 1 systems have been discovered and studied, such as AgVP2S6, Y2BaNiO5, PbNi2V2O8, SrNi2V2O8, and CsNiCl3. In this talk, we introduce a new compound of quasi-one-dimensional S = 1 chain with single crystalline specimen. Magnetic and thermal properties have been investigated down to 1.9 Kelvin and up to 14 Tesla. It is found that antiferromagnetically ordered states appear below TN = 30.5 K and a clear spin-flop transition occurs above 8.3 Tesla. The Ising-like Neel order in the quasi-one-dimensional S = 1 chain is mainly attributed to interchain interaction. We discuss the origin of the ordered state in this quasi-one-dimensional S = 1 chain compound