Magnetic transition induced by pressure in Gd2Mo2O7 as studied by neutron diffraction and mu SR

作者：Mirebeau I^*; Apetrei A; Goncharenko I; Andreica D; Bonville P

来源：Journal of Magnetism and Magnetic Materials, 2007, 310(2): 919-921.

DOI：10.1016/j.jmmm.2006.10.142

• frustration
• pyrochlore
• neutron diffraction
• mu SR
• pressure

R2Mo2O7 compounds show a ferromagnetic metal-insulating spin glass transition tuned by the radius of the rare earth ion R3+. We have studied Gd2Mo2O7 situated just above the threshold, by neutron diffraction and mu 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 70K at ambient pressure to 38K 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.

• 出版日期2007-3
• 单位中国地震局