  Exploring the phase diagram of QCD at finite density is a challenging problem
since first-principle calculations based on standard Monte Carlo methods suffer
from the sign problem. As a promising approach to this issue, the complex
Langevin method (CLM) has been pursued intensively.In this work, we investigate
the applicability of the CLM in the vicinity of the deconfinement phase
transition using the four-flavor staggered fermions. In particular, we look for
a signal of the expected first order phase transition within the validity
region of the CLM.
