The spontaneous and first-order phase transitions of order-order type induced by magnetic field in single-crystal samples of <$E roman {Fe sub 0,5 Mn sub 1,1 As}> and <$E roman {Fe sub 0,55 Mn sub 1,04 As}> with C38 crystal lattice (space group of <$E P4 "/" nmm> symmetry) are investigated under hydrostatic compression (up to 7 kbar) of the samples in the temperature range from 4,5 to 300 K. The temperature and field dependences of magnetization for different pressure values in constant and pulsed magnetic fields are measured. On the basis of the results obtained it is found that the magnetic field-induced first-order transitions by from the low-magnetic to the high-magnetic (HM) phase at low temperatures are irreversible but with a finite time of the HM phase existence. The qualitive explanation of the revealed phenomenon was based on the theory of magnetostriction blocking of new-phase nucleation for the first-order phase-transitions.

• Каменєв Володимир Іванович (1953–) (медичні науки)

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