Bulk magnetic and neutron diffraction data for the pyrochlore Yb2V2O7: Evidence for ferromagnetic coupling between Yb3+ and V4+ moments

Bulk magnetic data for the pyrochlore material Yb2V2O7 have been redetermined and compared with existing literature values. Susceptibility data from 300 to 77 K can be interpreted in terms of Curie-Weiss behavior above about 170 K, yielding the parameters Cm = 6.0 cm3 mole−1 K−1 and θc = −20 K. This θc is slightly more negative than values reported previously. The saturation moment at 4.2 K is 5.3 ± 0.1 μB, significantly greater than that …