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Lattice Structural Change at Ferromagnetic Transition in Nd2Mo2O7.

The temperature dependence of the structural parameters is investigated in ferromagnetic Mo pyrochlore Nd 2 Mo 2 O 7 , by means of high-resolution time-of-flight (TOF) neutron powder diffraction measurement. The Mo–O–Mo bond angle θ abruptly increases and the Mo–O bond length d decreases with the decrease of the temperature across the ferromagnetic transition temperature ( T C = 97 K). This structural variation suggests that itinerant carriers mediate the ferromagnetic coupling between Mo spins via the double-exchange mechanism.