We report on the magnetic properties of the layered perovskite PbVO3. The results of magnetic susceptibility and specific heat measurements as well as band-structure calculations consistently suggest that the S = 1/2 square lattice of vanadium atoms in PbVO3 is strongly frustrated due to next-nearest-neighbor antiferromagnetic interactions. The ratio of next-nearest-neighbor (J(2)) to nearest-neighbor (J(1)) exchange integrals is estimated to be J(2)/J(1) approximate to 0.2-0.4. Thus, PbVO3 is within or close to the critical region of the J(1)-J(2) frustrated square lattice. Supporting this, no sign of long-range magnetic ordering was found down to 1.8 K.
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