principal investigator: E.Babić
coworkers: K.Zadro, I.Kušević, R.Ristić and S.Sabolek
                   and M.Prester, J.Ivkov, Đ.Drobac, Ž.Marohnić (Institute of Physics)

        Systematic investigation of electrical and magnetic properties of selected high-T_c superconductors (HTS), amorphous metals (a-m), nanophase systems and molecular magnets is being pursued.
 
        For HTS (Bi-cuprates, Ag-sheathed tapes and single crystals), the origin of dissipation below T_c, the critical current density (J_c-B-T surface) and the magnetic phase diagram (the irreversible field B_irr and the field B* for maximum pinning-force density) are being studied in a broad temperature (2-120K) and magnetic field (BŁ23T) range.
        Research of a-m is focused on feromagnetic systems. The nature of magnetic phase transition and elementary excitations in strongly diluted (pŽp_c) ferromagnets (percolation and fractal phenomena) are investigated. The magnetization processes and the origin of the reduction of loss E in Fe- and Co- based soft a-ferromagnets (important for technological applications) are also studied. Similar studies are being pursued on new nanophase systems obtained by annealing a-ferromagnets. In non-magnetic Zr₂Ni_1–xM_x (M=3d metal) ternary a-systems the interplay of the electronic structure, magnetic state of M and disorder (weak localisation) is investigated.
        In the especially interesting molecular magnets (of Mn₁₂-acetates) the quantum tunneling of magnetization (quantum hysteresis) is being investigated by the use of a SQUID magnetometer at low temperatures (T>1.6K).