Dilution effects in Ho${}_{2-x}$Y${}_x$Sn${}_2$O${}_7$: from the Spin Ice to the single-ion magnet

Abstract

A study of the modifications of the magnetic properties of Ho${}_{2-x}$Y${}_x$Sn${}_2$O${}_7$ upon varying the concentration of diamagnetic Y${}^{3+}$ ions is presented. Magnetization and specific heat measurements show that the Spin Ice ground-state is only weakly affected by doping for $x\le 0.3$, even if non-negligible changes in the crystal field at Ho${}^{3+}$ occur. In this low doping range $\mu$SR relaxation measurements evidence a modification in the low-temperature dynamics with respect to the one observed in the pure Spin Ice. For $x\to 2$, or at high temperature, the dynamics involve fluctuations among Ho${}^{3+}$ crystal field levels which give rise to a characteristic peak in ${}^{119}$Sn nuclear spin-lattice relaxation rate. In this doping limit also the changes in Ho${}^{3+}$ magnetic moment suggest a variation of the crystal field parameters.

4 pages, 5 figures, proceedings of HFM2008 Conference

References in corpus (4)

• Magnetic Monopoles in Spin Ice
• Quantum and thermal spin relaxation in diluted spin ice: Dy(2-x)MxTi2O7 (M = Lu, Y)
• Direct evidence for a dynamical ground state in the highly frustrated Tb${}_2$Sn${}_2$O${}_7$ pyrochlore
• Non-monotonic zero point entropy in diluted spin ice

Cited by in corpus (4)

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• Non-monotonic residual entropy in diluted spin ice: a comparison between Monte Carlo simulations of diluted dipolar spin ice models and experimental results
• Amorphous ferromagnetism and re-entrant magnetic glassiness in Sm${}_2$Mo${}_2$O${}_7$: new insights into the electronic phase diagram of pyrochlore molybdates