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We discuss the physical properties of mixed compounds NiS2-xSex. In this system for x ~ 0.45 an insulator-metal transition occurs which is interpreted in the sense of the model of Mott and Hubbard. Our experimental results (susceptibility, N.M.R. with 77Se, Mössbauer spectroscopy with 61Ni and neutron diffraction) demonstrate the existence of an antiferromagnetic metallic phase (AFM) in the range of concentrations 0.45 ⩽ x ⩽ 1. The magnetic properties of the AFM phase are discussed in terms of a model which implies a strong influence of the local environment on the magnetic state of nickel atoms

le journal de physique colloques

PHYSICAL PROPERTIES OF COMPOUNDS NiS<sub>2-x</sub>Se<sub>x</sub> WITH PYRITE STRUCTURE : METAL-NON METAL TRANSITION, EVIDENCE FOR THE EXISTENCE OF AN ANTIFERROMAGNETIC METALLIC PHASE

PHYSICAL PROPERTIES OF COMPOUNDS NiS2-xSex WITH PYRITE STRUCTURE : METAL-NON METAL TRANSITION, EVIDENCE FOR THE EXISTENCE OF AN ANTIFERROMAGNETIC METALLIC PHASE

PHYSICAL PROPERTIES OF COMPOUNDS NiS_2-xSe_x WITH PYRITE STRUCTURE : METAL-NON METAL TRANSITION, EVIDENCE FOR THE EXISTENCE OF AN ANTIFERROMAGNETIC METALLIC PHASE