Nematic ordering in pyrochlore antiferromagnets: high-field phase of chromium spinel oxides

Emika Takata, Tsutomu Momoi, Masaki Oshikawa

Motivated by recent observation of a new high field phase near saturation in chromium spinels $A$Cr${}_2$O${}_4$ ($A=$ Zn, Cd, Hg), we study the $S=3/2$ pyrochlore Heisenberg antifer…