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arXiv · 1801.02724

Low frequency spin dynamics in XY quantum spin ice Yb$_2$Pt$_2$O$_7$

S. K. Takahashi·A. Arsenault·C. Mauws·A. M. Hallas·C. Sarkis·K. A. Ross·C. R. Wiebe·M. Tachibana·G. M. Luke·T. Imai
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Abstract

The XY pyrochlore Yb$_2$Ti$_2$O$_7$, with pseudo spin 1/2 at the Yb$^{3+}$ site, has been celebrated as potential host for the quantum spin ice state. The substitution of non-magnetic Ti with Pt gives Yb$_2$Pt$_2$O$_7$, a system with remarkably similar magnetic properties. The large nuclear gyromagnetic ratio ($γ_{n}/2 π= 9.15$~MHz/T) of $^{195}$Pt makes Yb$_2$Pt$_2$O$_7$ an ideal material for NMR investigation of its unconventional magnetic properties. Based on the $^{195}$Pt nuclear spin-lattice relaxation rate $1/T_1$ and the magnetic specific heat $C_{p}$ measured in a broad range of magnetic field $B_{ext}$, we demonstrate that the field-induced magnon gap linearly decreases with $B_{ext}$ but additional low energy mode of spin excitations emerge below $\sim 0.5$~T.

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S. K. Takahashi, A. Arsenault, C. Mauws, A. M. Hallas, C. Sarkis, K. A. Ross, C. R. Wiebe, M. Tachibana, G. M. Luke, T. Imai. 2018-09-24. Low frequency spin dynamics in XY quantum spin ice Yb$_2$Pt$_2$O$_7$. https://doi.org/10.1103/physrevb.98.104425

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