Abstract
Recently an anomalously large “excess” magnetic intensity was observed by Hirakawa and Yoshizawa for the (004) neutron reflection of K 2 CuF 4 . This was interpreted as a magnon condensate, superimposed on the magnetic Bragg reflection. A careful reexamination of this magnetic intensity as a function of incident neutron energies, as well as crystal dimensions, led us to conclude that this anomaly is caused by a novel extinction effect associated with neutron polarization.
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