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- W2019731083 abstract "${mathrm{R}}_{2}{mathrm{Mo}}_{2}{mathrm{O}}_{7}$ compounds show a ferromagnetic metal-insulator spin-glass transition tuned by the radius of the rare earth ion ${R}^{3+}$. We have studied ${mathrm{Gd}}_{2}{mathrm{Mo}}_{2}{mathrm{O}}_{7}$ located on the verge of the transition, by neutron diffraction on a $^{160}mathrm{Gd}$ isotopic sample, $ensuremath{mu}mathrm{SR}$ and x-ray diffraction using the synchrotron radiation. All measurements were done both at ambient and under applied pressure. At ambient pressure, a ferromagnetic state is observed below the Curie temperature $({T}_{mathrm{C}}=70phantom{rule{0.3em}{0ex}}mathrm{K})$. The ordered magnetic moments at $1.7phantom{rule{0.3em}{0ex}}mathrm{K}$ are parallel and equal to $5.7(5)phantom{rule{0.3em}{0ex}}{ensuremath{mu}}_{mathrm{B}}$ and $0.8(2)phantom{rule{0.3em}{0ex}}{ensuremath{mu}}_{mathrm{B}}$ for Gd and Mo, respectively. The relaxation rate measured by $ensuremath{mu}mathrm{SR}$ evidences strong spin fluctuations below ${T}_{mathrm{C}}$ and down to the lowest temperature $(6.6phantom{rule{0.3em}{0ex}}mathrm{K})$. A spin reorientation occurs in the range $20phantom{rule{0.3em}{0ex}}mathrm{K}<T<{T}_{mathrm{C}}$. The ferromagnetic state is strongly unstable under pressure. ${T}_{mathrm{C}}$ sharply decreases (down to $38phantom{rule{0.3em}{0ex}}mathrm{K}$ at $1.3phantom{rule{0.3em}{0ex}}mathrm{GPa}$) and Bragg peaks start to coexist with mesoscopic ferromagnetic correlations. The ordered moments decrease under pressure. At $2.7phantom{rule{0.3em}{0ex}}mathrm{GPa}$ long range magnetic order completely breaks down. In this spin-glass state, Gd-Gd spin correlations remain ferromagnetic with a correlation length limited to the fourth neighbor, and Gd-Mo spin correlations turn to antiferromagnetic. The unique combination of three microscopic probes under pressure provides a detailed description of the magnetic transition, crucial for further theories." @default.
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- W2019731083 title "Pressure-induced ferromagnet to spin-glass transition in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mi mathvariant=normal>Gd</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant=normal>Mo</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant=normal>O</mml:mi><mml:mn>7</mml:mn></mml:msub></mml:mrow></mml:math>" @default.
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- W2019731083 doi "https://doi.org/10.1103/physrevb.74.174414" @default.
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