Magnetic catalysis of parity breaking in a massive Gross-Neveu model and   high-temperature superconductivity
  In the framework of a (2+1)-dimensional P-even massive Gross-Neveu model, an external magnetic field is shown to induce a parity breaking first order phase transition. Possibility of applying the results obtained to description of magnetic phase transitions in high-temperature superconductors is discussed. 
V. Ch. Zhukovsky, K. G. Klimenko, V. V. Khudyakov, and D. Ebert