DHvA effect study of the effective cyclotron masses of the central and noncentral zeta orbits in lead

Cyclotron effective masses of two extremal orbits on the third zone electron arm in lead have been studied for the symmetry direction (110) using the de Haas-van Alphen effect. The temperature dependence of the amplitudes of both the node and antinode for the well known 42.5 cycle beat pattern has been analysed to evaluate each of the two individual cyclotron effective masses, i.e. m_c* and m_n* of the gamma _c and gamma _n oscillations, respectively. Here gamma _c and gamma _n denote the dHvA oscillations arising from the larger and smaller extremal orbits on the electron arm, respectively. The cyclotron effective mass ratios thus determined are m_c*/m₀=0.539+or-0.006 and m_n*/m₀=0.571+or-0.007, where m₀ is the rest mass of the free electron. These mass ratios are favourably compared with the ones recently determined by Onuki et al. (1977) using the Azbel-Kaner cyclotron resonance technique.