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2 sublattice have been investigated using neutron powder-diffraction, magnetic-susceptibility, and heat-capacity measurements. Reduction in the average A-site radius results in the distortion of the crystal structure from cubic for x = 0 to monoclinic for x = 2 without affecting the Y/Mo inversion 1%. Magnetic-susceptibility measurements evidence two paramagnetic regimes for all samples. The high-temperature HT Curie constants are independent of composition x 0.261 emu mol 1 K 1 while the low-temperature LT value gradually increases from 0.041 emu mol 1 K 1 for x = 0 to 0.101 emu mol 1 K 1 . The HT Weiss temperature increases from 159 K x =0 to 50 K x =2 while the LT values are 2.33 K for x 2 and +10 K for x = 2. Neutron powder diffraction does not evidence any Neel ordering. The x = 2 sample is weakly ferromagnetic below 8 K Msat 0.1 B / Mo in 1Ta t 5K which is consistent with the small positive LT Weiss temperature. The magnetic data are consistent with a valence bond glass state where the bulk of the spins condense into spin singlets as previously observed for Ba2YMoO6, leaving a small fraction of the spins isolated or only weak ferromagnetically coupled to each other.

physical review b

Persistence of the valence bond glass state in the double perovskites<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Ba</mml:mtext></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext>Sr</mml:mtext></mml:mrow><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mrow><mml:mtext>YMoO</mml:mtext></mml:mrow><mml:mn>6</mml:mn></mml:msub></mml:mrow></mml:math>

Persistence of the valence bond glass state in the double perovskitesBa2−xSrxYMoO6