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Strong frustration due to competing ferromagnetic and antiferromagnetic interactions: Magnetic properties of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>M</mml:mi><mml:msub><mml:mrow><mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:mtext>VO</mml:mtext></mml:mrow><mml:mo>)</mml:mo></mml:mrow></mml:mrow><mml:mn>2</mml:mn></mml:msub><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</…
We present a detailed investigation of the magnetic properties of complex vanadium phosphates $M{(\text{VO})}_{2}{({\text{PO}}_{4})}_{2}$ ($M=\text{Ca}$ and Sr) by means of magnetization, specific heat, $^{31}\text{P}$ NMR measurements, and band-structure calculations. Experimental data evidence the presence of ferromagnetic and antiferromagnetic interactions in $M{(\text{VO})}_{2}{({\text{PO}}_{4})}_{2}$, resulting in a nearly vanishing Curie-Weiss temperature ${\ensuremath{\theta}}_{\text{CW}}\ensuremath{\le}1\text{ }\text{K}$ …