Abstract
TF and ZFμSR-investigations were performed on high purity CuO powder. By TF measurements a phase transition to the ordered state was observed at 227K. A commensurate-incommensurate phase transition was detected at 213K by ZF measurements. In the commensurate phase we observed the Larmor precession. Four signals were detected below 55K, but by increasing temperature above 190K, precession became having only one component. This fact may be explained by muons tunneling between equivalent sites. In the incommensurate phase the Larmor precession was not detected because of too large damping.
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Duginov, V.N., Grebinnik, V.G., Gritsaj, K.I. et al. μSR investigation of cupric oxide. Hyperfine Interact 85, 317–322 (1994). https://doi.org/10.1007/BF02069441
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DOI: https://doi.org/10.1007/BF02069441