J. HASHIDA
Department of Physics, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan
T. MUTA
Department of Physics, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan
K. OHKURA
Department of Physics, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan

Received 12 May 1998

The supersymmetric version of the Nambu–Jona-Lasinio model is investigated in connection with the chiral symmetry breaking induced by a soft SUSY breaking term. It is found that the broken chiral symmetry due to the soft breaking term is restored at suitably high temperature and the symmetry restoration occurs as first-order phase transitions. The critical temperature at which the chiral symmetry is restored is determined as a function of the strength of the soft breaking term and the field coupling constant. The dynamical fermion mass is calculated at finite temperature. Some possible applications to the breaking scenario of unified field theories are discussed.