Calculation of dipole fields at interstices of rare-earth metals

An effective method for calculating the sum of dipole magnetic fields of la ttice sites is developed using the threefold axial symmetry and performing summation over hexagonal planes. The values of fields in octahedral and tet rahedral interstices of an hcp lattice are determined for spiral structures of heavy RE metals and for samarium. It is shown that the absence of an ex perimentally observed jump in the dipole field at the point of ferro-antife rromagnetic transition in the disposition is due to the small angle of rota tion of the spiral magnetic structure. The problem of interpretation of the Lorentz macroscopic field is discussed on the basis of calculation of micr oscopic fields in a homogeneous continuous medium. (C) 2000 MAIK "Nauka/Int erperiodica".