Antiferromagnetism and Antiferromagnetic Resonance in CuBr2·2H2O at 9800 Mc/sec

Abstract

Antiferromagnetic resonance was observed in a single crystal of Cu${\mathrm{Br}}_2$·2${\mathrm{H}}_2$O at liquid helium temperature. This crystal shows an isomorphous structure with that of Cu${\mathrm{Cl}}_2$·2${\mathrm{H}}_2$O and the experimental results are analogous to those for the latter. However, the resonance field shifts to the higher field side and this is considered to be the result of a stronger molecular field than that of Cu${\mathrm{Cl}}_2$·2${\mathrm{H}}_2$O. the Néel point of Cu${\mathrm{Br}}_2$·2${\mathrm{H}}_2$O was inferred to lie between 5°K and 6.5°K.