Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-10-03
Journal of Physics: Conference Series 145 (2009) 012033
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 5 figures, proceedings of HFM2008 Conference
Scientific paper
10.1088/1742-6596/145/1/012033
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 $x\leq 0.3$, 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.
Carretta Pietro
Ghigna Paolo
Giblin Sean R.
Lago J.
Pin S.
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