Magnetic properties of S=1/2 two-dimensional quantum antiferromagnet Cu(D2O)2(C2H6D2N2)SO4

Abstract Specific heat and susceptibility measurements of Cu(D 2 O) 2 (C 2 H 6 D 2 N 2 )SO 4 have been performed to investigate the influence of the partial deuteration on the magnetic properties of Cu(H 2 O) 2 (C 2 H 8 N 2 )SO 4 — a representative of an S = 1 / 2 spatially anisotropic triangular antiferromagnet with intralayer exchange coupling J e f f / k B ≈ 1.5 K . The analysis of experimental data at helium temperatures revealed a slight, less than 10% reduction of magnetic coupling as well as ordering temperature. The origin of the observed behavior is discussed.