Abstract
Abstract Fermi surface (FS) studies of 2HNbSe 2 have been performed by adopting two different and complementary methods, i.e. by the measurements of de Haas-van Alphen (dHvA) oscillation and positron annihilation (PA). The dHvA effect in the superconducting mixed state has been confirmed by a standard field modulation ac susceptibility method at 0.5 K, showing the existence of a small pancake shape FS. Two dimensional angular correlation of PA radiations has given a cylindrical hole surface with its axis along ΓA. These findings are discussed with relation to APW band calculation and also to an observation of dHvA effect in the mixed state of high-T c superconductor.
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