INVESTIGATION OF MAGNETIC-PROPERTIES OF SOLIDS IN ULTRAHIGH PULSED MAGNETIC-FIELDS

The developed techniques of up to 1000 T pulsed magnetic fields produc tion in a volume of several cm(3) as well as of obtaining low sample t emperatures made it possible to carry out a series of studies of funda mental properties of substances in such fields. A characteristic featu re of these studies is that the energy of the magnetic ion in similar to 1000 T fields is comparable to or more than the energies of exchang e and spin-orbital interactions, the energy of the crystalline field a nd is in excess of the thermal energy at room temperature. This allowe d to reveal some interesting phenomena such as magnetization with magn etic fields of light waves, semiconductor-metal phase transition into a non-collinear phase, cyclotron and electron paramagnetic resonances at optical frequencies, brightening of an opaque sample, concurrence o f circular and linear birefringence in an antiferromagnet, Ising ferri magnetic magnetization jumps at 77 K, etc. Using ultrahigh magnetic fi elds for HTSC investigation allowed to measure the magnitudes of the u pper critical fields and the de Haas-van Alphen frequencies. The new e ffects are observed in broadband dielectrics under isentropic compress ion by ultrahigh magnetic fields.