A study of the modifications of the magnetic properties of Ho2-YxSn2O7 upon varying the concentration of diamagnetic Y3+ ions is presented. Magnetization and specific heat measurements show that the Spin Ice ground-state is only weakly affected by doping for x ≤ 0.3, even if non-negligible changes in the crystal field at Ho3+ occur. In this low doping range μSR relaxation measurements evidence a modification in the low-temperature dynamics with respect to the one observed in the pure Spin Ice. For x → 2, or at high temperature, the dynamics involve fluctuations among Ho3+ crystal field levels which give rise to a characteristic peak in 119Sn nuclear spin-lattice relaxation rate. In this doping limit also the changes in Ho3+ magnetic moment suggest a variation of the crystal field parameters.

Dilution effects in Ho2-xYxSn2O7: From the spin ice to the single-ion magnet

Prando, Giacomo;Carretta, Pietro;Ghigna, Paolo
2009-01-01

Abstract

A study of the modifications of the magnetic properties of Ho2-YxSn2O7 upon varying the concentration of diamagnetic Y3+ ions is presented. Magnetization and specific heat measurements show that the Spin Ice ground-state is only weakly affected by doping for x ≤ 0.3, even if non-negligible changes in the crystal field at Ho3+ occur. In this low doping range μSR relaxation measurements evidence a modification in the low-temperature dynamics with respect to the one observed in the pure Spin Ice. For x → 2, or at high temperature, the dynamics involve fluctuations among Ho3+ crystal field levels which give rise to a characteristic peak in 119Sn nuclear spin-lattice relaxation rate. In this doping limit also the changes in Ho3+ magnetic moment suggest a variation of the crystal field parameters.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11571/147802
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