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VOLUME 28 (1978) | ISSUE 6 | PAGE 337
Singularities of magnetic phase transitions in heavy rare-earth metals
The magnetic phase transitions in the heavy rare-earth metal thullium (Tm) were investigated on the basis of the fluctuation theory of phase transitions. It is shown that N + 1 (N =6) stationary states are produced in thullium when it goes from the paramagnetic region into the disordered state, and only in the lowest order state does the crystal have a nonzero spontaneous magnetic moment. The phase transition to the ground state of the system turns out to be of second order, and all others are fluctuation phase transitions of first order.