Pressure tuning of the rare-earth monopnictide DySb

We have systematically investigated the electrical and structural properties of DySb, a potential magnetic topological semimetal, under applied pressure up to 26.8 GPa. At ambient conditions, DySb shows an antiferromagnetic phase transition at TN = 10.5 K. With increasing pressure, TN shows a nonmonotonic dependence of pressure and arrives the maximum at about 13 GPa. Just above that pressure, we see strong indications of superconductivity (SC) with an onset superconducting transition temperature Tconset of 2.2 K, concomitant with a structural phase transition from NaCl to CsCl structure. Extreme magnetoresistance as large as 1.4×105% is observed at T=2 K and H= 9 T at ambient conditions with no sign of saturation. With increasing pressure, magnetoresistance (MR) is greatly suppressed at P=13.5 GPa, around which superconductivity emerges. Thus, DySb provides a good platform to study the relationship among MR, SC, and the structural phase transition.