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Mar 20 – 23, 2023
Campus Garching
Europe/Berlin timezone

Fractional Excitation-induced Phonon Renormalization in α-RuCl3

Mar 20, 2023, 12:10 PM
SCC/3-Venus - Venus (Galileo)

SCC/3-Venus - Venus


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Talk (17 + 3 min) Magnetism, Superconductivity, Topological Systems, Magnetic Thin Films an other electronic phenomena Frustrated Magnets 1


Adrian Merritt (JCNS)


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, α-RuCl3 is a promising Kitaev QSL candidate. Above the critical magnetic field Bc~7T and below T~6K there is evidence for the fractional excitations in the QSL phase. Although previous inelastic neutron scattering measurements have focused on magnetic excitations, the phonon dispersions have not been well-studied. However, 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. Our measurements have focused on the phonon dispersion in α-RuCl3 to observe this phonon renormalization effect. We have used high-quality in-house grown α-RuCl3 single crystals for inelastic neutron and x-ray scattering measurements, combined with phonon dynamics calculations, to survey the acoustic phonons, in particular under magnetic fields. We will discuss our results with a focus on examining the low-energy acoustic phonon relevant to the phonon renormalization effect. Notably, our inelastic neutron scattering measurements under magnetic field will be compared with inelastic x-ray scattering measurements without a magnetic field and with DFT calculations of the phonon branches to clarify the behavior of these phonon branches in this phase of interest.

Primary authors

Adrian Merritt (JCNS) Dr Yixi Su (JCNS-MLZ)


Alexandre IVANOV (Institut Laue-Langevin, Grenoble) Dr Alexei Bosak (ESRF) Dr Luigi Paolasini (ESRF) Ovi Garlea Rolf Heid (Karlsruhe Institute of Technology)

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