Apparent diamagnetism in quasi-two-dimensional Heisenberg antiferromagnets

We observed an apparent diamagnetism in representative quasi-two-dimensional Heisenberg canted antiferromagnets, (CnH2n+1NH3)2MnCl4, indicating that the quasi-one-dimensionality is not essential for the apparent diamagnetism. The apparent diamagnetic response seems to be promoted by a thermal quenching and is characterized by a linear response to the applied magnetic field with a constant internal field.