Quantum magnetism of perfect spin tetrahedra in Co${}_4$B${}_6$O${}_{13}$

Hiroyuki Hagiwara, Hirohiko Sato, Masahiro Iwaki +2

Co${}_4$B${}_6$O${}_{13}$ contains undistorted tetrahedral clusters of magnetic Co${}^{2+}$ ions. The high-field magnetization of this magnet exhibits a periodic undulation indicating…