Phase transitions of the five-state clock model on the square lattice*

Project supported by the Fundamental Research Funds for the Central Universities, China (Grant No. 531107040857), the Natural Science Foundation of Hunan Province, China (Grant No. 851204035), and the National Natural Science Foundation of China (Grant No. 11774420).

Chen Yong1, Xie Zhi-Yuan2, Yu Ji-Feng1, †
       

(color online) Temperature dependence of the internal energy and the specific heat with h = 0 and D = 40. Two obvious peaks indicate two possible phase transition from the specific heat.