Abstract
The dHvA effect experiments on Nb have been performed in low fields down to H c2 using a standard field modulation method. The signal amplitude becomes much smaller below H c3 than that expected from a straight extension of the Dingle plot from the higher fields and is below the noise level around and below H c2. The rapid decrease of the amplitude below H c3 is simply understood as arising from the screening of the modulation field and is expected to be observed for other homogeneous type-II superconductors. The present observation is inconsistent with those reported for materials such as NbSe 2, where the same or comparable amplitudes to those in the normal state are detected below H c2 by the field modulation method.
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