Discovery of a new Hall effect: Does it violate Onsager's reciprocal theorem?

Researchers at the University of Tsukuba and NIMS have observed a novel Hall effect wherein the deflection direction of current varies according to the current flow direction. Onsager's reciprocal theorem, a fundamental theorem in materials science, asserts the impossibility of such a phenomenon. However, the researchers found that the observed phenomenon could be explained without contradicting the reciprocal theorem by assuming an unconventional magnetic arrangement.