![]() ![]() 1Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.Halász 1,4, Yongqiang Cheng 5,§, Arnab Banerjee 3,4,¶, and Tom Berlijn 7,∥ Nagler 5,4, Jiaqiang Yan 1,4, Paula Lampen-Kelley 1,6, David Mandrus 1,6, Carlos A. Dixit 3,4,†,‡, Xiaoping Wang 5, Douglas L. In addition, we use low-energy interlayer phonons to resolve the low-temperature stacking structure of our large crystal of α − RuCl 3, which we find to be consistent with that of the R 3 ¯ space group, in agreement with neutron diffraction. We find that the phonons in α − RuCl 3 that either propagate or vibrate in the out-of-plane direction have significantly reduced velocities and therefore have the potential to dominate the observability of the elusive half-integer plateaus in the thermal Hall conductance. After validating our theoretical model, we extrapolate the low-energy phonon properties. Our results show excellent agreement between experiment and first-principles calculations. We investigate the phonon structure of α − RuCl 3 via inelastic neutron-scattering experiments and density-functional-theory calculations. While many studies have focused on the magnetic excitations in α − RuCl 3, its vibrational excitation spectrum has remained relatively unexplored. Understanding phonons in α − RuCl 3 is critical to analyze the controversy around the observation of the half-integer thermal quantum Hall effect. ![]()
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