Abstract

We report the observation of spin-polarized photoelectron diffraction for antiferromagnetic MnO(001). Data at kinetic energies near 100 eV for the spin-split Mn $3s$ multiplet show abrupt changes in the $^{5}S:^{7}S$ intensity ratio at a temperature of 530\ifmmode\pm\else\textpm\fi{}20 K that is 4.5 times the N\'eel temperature. An additional temperature-dependent study done at higher electron kinetic energies, along with azimuthal diffraction measurements, support the conclusion that this abrupt change is due to a new type of high-temperature short-range-magnetic-order transition.

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