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Absolute Amplitude, Dingle Temperature and Frequency of de Haas-van Alphen Oscillations in Pd—H Alloys

Measurements of the hydrogen concentration dependence of the area of extremal crosssections of the Fermi surface of dilute a-Pd —H alloys show that a substantial fraction (36%) of additional hydrogen electrons occupy states in the low-lying bonding band and the s— states which are lowered in energy by the attractive potential of the hydrogen impurities. The remaining 64% fill empty states at the top of the d-band of Pd. It is also found that the de Haas-van Alphen frequency shifts are not proportional to the hydrogen concentration for x>0.003 as a result of a segregation in aand a'-phase. This has not been realized in early measurements (see [12]) and led to the wrong conclusion that only a negligible fraction of electrons fill the d-band of Pd.