Abstract
R 2 Mo 2 O 7 compounds show a ferromagnetic metal-insulating spin glass transition tuned by the radius of the rare earth ion R 3 + . We have studied Gd 2 Mo 2 O 7 situated just above the threshold, by neutron diffraction and μ SR , at ambient and under applied pressure. A ferromagnetic state with strong fluctuations is stabilized at ambient pressure. Under pressure, the Curie temperature strongly decreases, from 70 K at ambient pressure to 38 K at 1.3 GPa. The intensity of the Bragg peaks decreases, whereas mesoscopic correlations appear. At 2.7 GPa, magnetic long-range order completely breaks down and a spin glass-like state is stabilized, with only short-range correlations. The study provides a microscopic characterization of the magnetic correlations and spin fluctuations throughout the transition.
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