Abstract
Quantum oscillations in the frequency range 0.04–8 MG have been observed in the magnetoresistance of single crystals of 4Hb-TaS 2. These have been studied as a function of applied pressure up to 7 kbar. Pressures in this range depress the charge density wave in the trigonal prismatic layers and the effects on the amplitudes and frequencies of the magnetoquantum oscillations have been studied. Application of pressure produces a dramatic reduction of amplitude for most oscillations, and several undergo definite frequency shifts. These effects are interpreted as resulting from a sensitive pressure dependence of the charge density wave gaps which dominate the Fermi surface topology. Magnetic breakdown and interference orbits may also play a role.
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