De Haas-van Alphen effect and magnetoresistance in YbBi2

We have measured the de Haas-van Alphen (dHvA) effect and the magnetoresist ance in orthorhombic YbBi2. The eight dHvA branches alpha, beta, gamma, del ta, epsilon, xi, eta, and theta were observed in the frequency range of 40- 4000 T. The cyclotron masses range from 0.07m(0) to 1.4m(0). The lowest-fre quency branch x originates from a small cylindrical Fermi surface elongated the b-axis. The branch beta corresponds to a nearly spherical Fermi surfac e with the frequency about 1700 T. The branches gamma, delta, epsilon, and xi with the frequencies 2000-4000 T are in limited field angle region near the b-axis. The results of the magnetoresistance are explained by above Fer mi surface features with the open orbit along the h-axis. (C) 2000 Elsevier Science B.V. All rights reserved.