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Chemical Control of Spin Chirality in (Nd_(1-x) Dy_x)₂ Mo₂ O₇
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Chemical Control of Spin Chirality in (Nd_(1-x) Dy_x)₂ Mo₂ O₇
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Magnetization and Hall resistivity have been investigated for single crystals of Dy-doped Nd$_{2}$Mo$_{2}$O$_{7}$. A sharp decrease of the Hall resistivity upon a metamagnetic transition, perhaps associated with magnetic-field ($H$) induced flop of Dy$^{3+}$ moments, has been observed in the Dy-doped crystals only for $H \parallel [111]$ direction. In addition, the sign of the Hall resistivity at a high field, both for $H \parallel [100]$ and for $H \parallel [111]$, changes with the Dy-doping. These results are explained in terms of the sign change of Mo spin chirality that is controlled by the Dy$^{3+}$ moments with a different sign of $f$-$d$ interaction from the Nd$^{3+}$ moments.
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