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High-field study of muonium states in HfO2 and ZrO2

Authors: R. B. L. Vieira, R. C. Vil√£o, H. V. Alberto, J. M. Gil, A. Weidinger, B. B. Baker, P. W. Mengyan and R. L. Lichti

Ref.: Journal of Physics: Conference Series 551, 012048 (2014)

Abstract: We present high-transverse field measurements, as a function of temperature, in monoclinic ZrO2 and HfO2. In monoclinic zirconia and hafnia, a diamagnetic component had been previously reported in low-transverse-fields, but a significant fraction of the total muon polarization was missing in these experiments. We now characterize this missing fraction using the high-field capabilities at TRIUMF: a high relaxation component (above 100 mu s(-1) in monoclinic ZrO2, about 10 mu s(-1) in HfO2) is observed, which we relate to the formation of compact muonium in these materials. A model for the formation of muonium in these materials is presented.

DOI: 10.1088/1742-6596/551/1/012048