High-field study of muonium states in HfO2 and ZrO2

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.

keywords

HYDROGEN

subject category

Physics

authors

Vieira, RBL; Vilao, RC; Alberto, HV; Gil, JM; Weidinger, A; Baker, BB; Mengyan, PW; Lichti, RL

our authors

acknowledgements

The technical help of the SR team at TRIUMF is gratefully acknowledged. This work was supported from funds from FEDER ( Programa Operacional Factores de Competitividade COMPETE) and from FCT - Fundacao para a Ciencia e Tecnologia under projects PEstC/ FIS/ UI0036/ 2014 and PTDC/ FIS/ 102722/ 2008. RBLV was also supported by PhD grant SFRH/ BD/ 87343/ 2012 from FCT - Fundacao para a Ciencia e Tecnologia. Participation of the TTU group is supported by the Welch Foundation ( grant D- 1321).

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