Abstract
The internal nuclear magnetic field in a superconducting MgB2 powder sample was studied with a µ−SR technique. Although the past µ+SR study on MgB2 reported the appearance of a dynamic behavior even below Tc due to µ+ diffusion, µ−SR shows a static behavior in the whole temperature range measured, as expected. The ZF-µ−SR spectra do not suggest any appearance of additional magnetic field below Tc within the experimental accuracy. Considering the small asymmetry of the µ−SR signal, it is a challenge to detect the appearance of an internal magnetic field below Tc caused by the time reversal symmetry breaking.
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