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Magnetic properties of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mtext>BaCdVO</mml:mtext><mml:msub><mml:mrow><mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:msub><mml:mrow><mml:mtext>PO</mml:mtext></mml:mrow><mml:mn>4</mml:mn></mml:msub></mml:mrow><mml:mo>)</mml:mo></mml:mrow></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>: A strongly frustrated spin-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:…
We report magnetization and specific-heat measurements on polycrystalline samples of $\text{BaCdVO}{({\text{PO}}_{4})}_{2}$ and show that this compound is a $S=1/2$ frustrated square lattice with ferromagnetic nearest-neighbor $({J}_{1})$ and antiferromagnetic next-nearest-neighbor $({J}_{2})$ interactions. The coupling constants ${J}_{1}\ensuremath{\simeq}\ensuremath{-}3.6\text{ }\text{K}$ and ${J}_{2}\ensuremath{\simeq}3.2\text{ }\text{K}$ are determined from a fitting of the susceptibility data and confirmed …