Abstract
We grew single crystals of tetragonal UAs 2 and UP 2 using chemical transport method. The residual resistivity ratio of 580 and 2900, respectively, indicated high quality of samples. Shubnikov–de Haas effect measurements performed on whisker single crystals of both compounds revealed seven fundamental oscillations in UAs 2 and two in UP 2. Five oscillations in UAs 2 correspond to the cylindrical Fermi surfaces. The cyclotron masses in UAs 2 were determined to range from 0.33 m 0 to 4.5 m 0. The two-dimensional Fermi surfaces are due to the strongly flattened magnetic Brillouin zone, the sequence of conducting U planes separated by weakly conducting As planes and, possibly, the anisotropic hybridization of 5f electrons.
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