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We report the magnetic susceptibility and the low-temperature specific heatof a double perovskite compound, Sr2CuTeO6, which is expected as the spin-1/2square-lattice Heisenberg antiferromagnet with nearest-neighbor J1 andnext-nearest-neighbor J2 exchange interactions. The specific heat exhibits asharp lambda-like anomaly at TN = 4.8 K indicative of magnetic ordering, whichis much lower than those in isostructural A2CuMO6 with A = Ba, Sr and M = W,Mo. This indicates the strong suppression of magnetic ordering in Sr2CuTeO6. Weestimate the exchange constant J1/kB ~ 80 K and J2/J1 < 0.07 from magneticsusceptibility data using Pade approximation of high temperature expansion andquantum Monte Carlo method. The strong suppression of magnetic ordering inSr2CuTeO6 should be ascribed to the weekness of the interlayer exchange.

Strong Suppression of Magnetic Ordering in an S = 1/2 Square-Lattice Heisenberg Antiferromagnet Sr2CuTeO6