Experimental Verification of the Universality of Magnetic-Field-Induced Bose-Einstein Condensation of Magnons

Kazuki Shirasawa, Nobuyuki Kurita, Hidekazu Tanaka

CsFeBr${}_3$ is an $S=1$ hexagonal antiferromagnet that has a singlet ground state owing to its large easy-plane single-ion anisotropy. The critical behavior of the magnetic-fi…