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Frustrated square lattice with spatial anisotropy: Crystal structure and magnetic properties of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mtext>PbZnVO</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>
Crystal structure and magnetic properties of the layered vanadium phosphate $\text{PbZnVO}{({\text{PO}}_{4})}_{2}$ are studied using x-ray powder diffraction, magnetization and specific-heat measurements, as well as band-structure calculations. The compound resembles $A{A}^{\ensuremath{'}}\text{VO}{({\text{PO}}_{4})}_{2}$ vanadium phosphates and fits to the extended frustrated square-lattice model with the couplings ${J}_{1},\text{ }{J}_{1}^{\ensuremath{'}}$ between nearest neighbors and ${J}_{2},\text{ …