Absolute values of ac susceptibility of specimens shaped as a rectangular prism are obtained by numerical calculations of the magnetic field created by the specimen. The obtained values for superconducting samples are compared with the expected value.
The induced magnetic moment of polycrystalline PrNi& was investigated at T=4.2 K in magnetic fields up to 40 T. The magnetization increases faster than linear in magnetic fields less than 14 T, which is believed to be a result of a level crossing induced by the magnetic field. The observed magnetization compares well with the induced magnetic moment, calculated on the basis of a molecularfield Hamiltonian, which includes the crystalline electric field potential, Zeeman term, and isotropic exchange interactions. The calculations indicate that at lower temperatures the level crossing would give a stepwise increase of the magnetization, which is expected to be between 15 and 19 T, depending on the crystal-field level scheme. At 4.2 K the transition is smeared out and should be very sharp if the temperature is lowered below 1 K.
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