Abstract
By means of the muon spin rotation technique (μ+SR), the temperature dependence of the magnetic field inside the normal-conducting domains of high-purity tantalum crystals in the intermediate state has been measured in the temperature range 2.36K<T<3.5K. The results agree well with macroscopic measurements of the thermodynamical critical field. It is also shown that the distribution of magnetic fields in the mixed state of niobium single crystals may be determined by μ+SR. Possible applications of these findings to the study of long-range diffusion of positive muons at low temperatures are indicated.
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