Magnetic phase boundary of BaVS3 clarified with high-pressure μ+SR

Abstract

The magnetic nature of the quasi-one-dimensional BaVS3 has been studied as a function of temperature down to 0.25 K and pressure up to 1.97 GPa on a powder sample using the positive muon spin rotation and relaxation (μ+SR) technique. At ambient pressure, BaVS3 enters an incommensurate antiferromagnetic ordered state below the Néel temperature (TN)31K. TN is almost constant as the pressure (p) increases from ambient pressure to 1.4 GPa, then TN decreases rapidly for p>1.4GPa, and finally disappears at p∼1.8GPa, above which a metallic phase is stabilized. Hence, TN is found to be equivalent to the pressure-induced metal-insulator transition temperature (TMI) at p>1.4GPa.