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Regensburg 2022 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 8: Frustrated Magnets – Strong Spin-Orbit Coupling

TT 8.2: Talk

Monday, September 5, 2022, 17:30–17:45, H10

Fractional Excitation-induced Phonon Renormalization in α-RuCl3Adrian Merritt1, Xiao Wang1, Alexei Bosak2, Luigi Paolasini2, Alexandre Ivanov3, Rolf Heid4, and •Yixi Su11Jülich Centre for Neutron Science JCNS-FRM II, Forschungszentrum Jülich GmbH, Garching, Germany — 2European Synchrotron Radiation Facility (ESRF), Grenoble, France — 3Institut Laue-Langevin, Grenoble, France — 4Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, Karlsruhe, Germany

The quantum spin liquid (QSL) phase is of immense interest to condensed matter physicists, and have been studied for decades. With a Kitaev model that is exactly solvable and gives a QSL ground state, more recent work has focused on the Jeff=1/2 materials and in particular, α-RuCl3. Above the critical magnetic field Bc 7T and below T 6K there is evidence for the half-integer quantized plateau possibly arising from the fractional excitations in the QSL phase. Recent theoretical work has shown that the fractional excitations can induce phonon renormalization via the spin-lattice coupling, and would in particular affect the acoustic phonons near the zone boundary. Our measurements have focused on the phonon dispersion in α-RuCl3 to observe this phonon renormalization effect in the putative QSL phase. We have been able to survey the acoustic phonons in the relevant scattering directions under magnetic fields using single crystals. We will discuss our results with a focus on examining the low-energy acoustic phonon branches we measured in comparison to published work as well as the observed phonon renormalization effect.

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