De Haas-van Alphen Effect and Energy Band Structure in UB2

Abstract

We grew a single crystal of UB 2 with the hexagonal structure and observed the de Haas-van Alphen (dHvA) oscillation. All of the dHvA branches, which are about seven in number, are detected in the limited angle regions. They are well explained by the 5 f -itinerant relativistic band theory with an exchange and correlation potential in a local density approximation. Namely, UB 2 is a compensated metal with an equal number of electron and hole. The Fermi surface consists of two closed but corrugated Fermi surfaces. The cyclotron masses are moderately heavy, ranging from 1.2 to 7.7 m 0 .