U eff	Effective Hubbard parameter. In order to deal with the strong correlation of Cr3+, the Hubbard empirical parameter U is added using Dudarev’s approach, Ueff = U − J, where U and J are the on-site Coulomb interaction and the strength of the effective on-site exchange interaction, respectively.
S i	The normalized spin vector sitting on lattice site i.
J1 and J2	The in-plane nearest neighbor and the next-nearest neighbor magnetic exchange coupling parameters.
k B	The Boltzmann constant.
M	The normalized magnetization.
χ	The magnetic susceptibility.