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The magnetic properties of $\alpha$-NaFeO$_2$ are studied by neutrondiffraction and magnetization measurements. An ordered phase with spins alignedalong the b$_hex$ axis exists at low temperatures (T < 4 K). At intermediatetemperatures (4 K < T < 11 K), the system passes through an incommensurateordered phase before transforming into a short range ordered state at highertemperatures that persists up to at least 50 K. Although the short rangeordering does not persist to room temperature according to neutron diffraction,the magnetic susceptibility does not follow Curie-Weiss behavior, even up to320 K. This rich magnetic behavior can be understood qualitatively as acompetition between different magnetic exchange interactions that are similarin magnitude. The delicate balance between these interactions makes$\alpha$-NaFeO$_2$ a candidate for more detailed theoretical work to understandmagnetic behavior in frustrated magnetic systems.Comment: Submitted to Phys Rev B, 7 pages, 8 figure

physical review. b, condensed matter and materials physics

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Magnetic structure and properties of theS=5∕2triangular antiferromagnetα−NaFe