  We study critical phenomena at a tricritical point associated with a chiral
phase transition which emerges in the D3/D7 model in the presence of a finite
baryon number density and an external magnetic field. We numerically determine
critical exponents related to the thermodynamic quantities and correlation
functions. We find that the values of the critical exponents agree with the
mean-field values. The scaling relations between the critical exponents are
satisfied, implying that the scaling hypothesis for the free energy and the
correlation functions hold. Our results indicate that the critical phenomena at
the tricritical point in the D3/D7 model are well described by the conventional
Landau theory.
