DHVA EFFECT OF DYSB IN QUADRUPOLE ORDERED STATE

The dHvA oscillations for DySb is first detected for field direction r otated in the (0 0 1)-(1 1 1)-(1 1 0) plane. The magnetic field was sw ept from 65-97 kOe, which covered the ferrimagnetic structure with HoP -type and ferromagnetic state. The dHvA signals are quite different be tween both structures. The conduction-electron Fermi surface located a t the X-z point was strongly reduced. It clearly shows that the intera ction between the quadrupole moment and the conduction electrons stron gly affects the Fermi surfaces for DySb compared to the other RSb.