Magnetic properties of some paramagnetic crystals at low temperatures

摘要: The principal magnetic susceptibilities and anisotropies of a number salts the iron group have been measured from room temperature down to about 80° K. results are discussed in light crystalline field theory developed by Van Vleck, Schlapp & Penney. 1. Both Mn ++ Fe +++ ions being S -state, extremely feeble, variation susceptibility follows almost exactly Curie law. 2. In Stark pattern for Cr lowest level is singlet, with (2 s + l)-fold spin degeneracy, which far removed upper levels, so ion behaves as if it were -state. 3. spin-orbit coupling Ni much greater than that . This responsible an appreciable anisotropy deviation These deviations utilized calculate crystal constants. It found both cubic rhombic parts nearly same magnitude all nickel salts, they practically independent temperature. 4. ground Co triplet, hence their properties more sensitive part salts. An estimate made. 5. copper fall into three distinct classes judged properties. first group, Tutton belong, moments different directions, but them second class order before, decrease lowering double chloride ammonium typical example this class. To third belongs cupric acetate monohydrate, very low even at temperature, rapidly lowered, correspond non-cubic different, highest third. 6. ferrous there axis symmetry, though structures do not lead it. 7. axes few crystals change directions range covered. 8. influence covalent binding on electric its effect discussed.