Phys. Rev. Lett. 100, 017206 (2008) [4 pages]Anomalous Temperature Evolution of the Internal Magnetic Field Distribution in the Charge-Ordered Triangular Antiferromagnet AgNiO2Received 2 August 2007; published 10 January 2008 Zero-field muon-spin relaxation measurements of the frustrated triangular quantum magnet AgNiO2 are consistent with a model of charge disproportionation that has been advanced to explain the structural and magnetic properties of this compound. Below an ordering temperature of TN=19.9(2) K we observe six distinct muon precession frequencies, due to the magnetic order, which can be accounted for with a model describing the probable muon sites. The precession frequencies show an unusual temperature evolution which is suggestive of the separate evolution of two opposing magnetic sublattices. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.017206
DOI:
10.1103/PhysRevLett.100.017206
PACS:
75.50.Ee, 75.40.−s, 75.50.−y, 76.75.+i
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