Unconventional Magnetic Ground State in Yb${}_2$Ti${}_2$O${}_7$

Abstract

We report low temperature specific heat and muon spin relaxation/rotation ($\mu$SR) measurements on both polycrystalline and single crystal samples of the pyrochlore magnet Yb${}_2$Ti${}_2$O${}_7$. This system is believed to possess a spin Hamiltonian supporting a Quantum Spin Ice (QSI) ground state and to display sample variation in its low temperature heat capacity. Our two samples exhibit extremes of this sample variation, yet our $\mu$SR measurements indicate a similar disordered low temperature state down to 16 mK in both. We report little temperature dependence to the spin relaxation and no evidence for ferromagnetic order, in contrast to recent reports by Chang \emph{et al.} (Nat. Comm. {\bf 3}, 992 (2012)). Transverse field (TF) $\mu$SR measurements show changes in the temperature dependence of the muon Knight shift which coincide with heat capacity anomalies. We are therefore led to propose that Yb${}_2$Ti${}_2$O${}_7$ enters a hidden order ground state below $T_c\sim 265$ mK where the nature of the ordered state is unknown but distinct from simple long range order.

Accepted for publication in Phys. Rev. B. 5 pages, 4 figures

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• Spin dynamics in the presence of competing ferro- and antiferro-magnetic correlations in Yb2Ti2O7
• Spin excitations in the frustrated triangular lattice antiferromagnet NaYbO${}_2$
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• Universal Dynamic Magnetism in Yb-Pyrochlores with Disparate Ground States
• XY Antiferromagnetic Ground State in the Effective S=1/2 Pyrochlore Yb2Ge2O7
• Role of defects in determining the magnetic ground state of ytterbium titanate
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• Temperature and Magnetic Field Dependence of Spin Ice Correlations in the Pyrochlore Magnet Tb2Ti2O7
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• A novel type of splayed ferromagnetic order observed in Yb2Ti2O7
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• Dynamical scaling as a signature of multiple phase competition in Yb${}_2$Ti${}_2$O${}_7$
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• Anomalously slow spin dynamics and short-range correlations in the quantum spin ice systems Yb2Ti2O7 and Yb2Sn2O7
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• Inertial effects in systems with magnetic charge
• Effects of "stuffing" on the atomic and electronic structure of the pyrochlore Yb${}_2$Ti${}_2$O${}_7$
• Traversing the pyrochlore stability diagram; microwave-assisted synthesis and discovery of mixed B-site Ln${}_2$InSbO${}_7$ family
• Long-wavelength correlations in ferromagnetic titanate pyrochlores as revealed by small angle neutron scattering
• Anomalous Proximitized Transport in Metal/Quantum Magnet Heterostructure $\mathrm{B}{\mathrm{i}}_2\mathrm{I}{\mathrm{r}}_2{\mathrm{O}}_7/Y{\mathrm{b}}_2\mathrm{T}{\mathrm{i}}_2{\mathrm{O}}_7$
• Evidence for spin liquid behavior in the frustrated three-dimensional $S=1/2$ Heisenberg garnet NaCa${}_2$Cu${}_2$(VO${}_4$)${}_3$
• Superdislocations and point defects in pyrochlore Yb2Ti2O7 single crystals and implication on magnetic ground states