Abstract
In order to elucidate the antiferromagnetic (AF) nature of hexagonalAg2NiO2 with TN = 56 K and to know the mechanism of the structural phase transition ofTS∼270 K, neutron powder diffraction patterns have been measured in the temperature rangebetween 1.5 and 330 K. One magnetic Bragg peak indexed as is clearly observed below TN, confirming the formation of long-range AF order, reported by a muon-spin spectroscopymeasurement. The weak intensity of the magnetic peak also suggests the two-dimensionalnature of the AF order, but the spin structure is still unknown. In addition, theprecise structural analysis of the data between 160 and 330 K shows that only thecH-axis length changesdrastically at TS, which suggests the appearance of local Jahn–Teller distortion belowTS.
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