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

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 (${\gamma }_n/2\pi =9.15$~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.

Final accepted version

References in corpus (6)

• Definitive Evidence for Order-by-Quantum-Disorder in Er2Ti2O7
• Quasiparticle Breakdown and Spin Hamiltonian of the Frustrated Quantum Pyrochlore Yb${}_2$Ti${}_2$O${}_7$ in Magnetic Field
• Experimental Insights into Ground State Selection of Quantum XY Pyrochlores
• Low Energy Electrodynamics of Novel Spin Excitations in the Quantum Spin Ice Yb${}_2$Ti${}_2$O${}_7$
• Relief of Frustration in the Heisenberg Pyrochlore Antiferromagnet Gd${}_2$Pt${}_2$O${}_7$
• Magnetic Excitations in the Ground State of $\mathrm{Y}{\mathrm{b}}_2\mathrm{T}{\mathrm{i}}_2{\mathrm{O}}_7$