Fractionalized excitations probed by ultrasound

Hauspurg, A.; Zherlitsyn, S.; Helm, T.; Felea, V.; Wosnitza, J.; Tsurkan, V.; Choi, K. -Y.; Do, S. -H.; Ye, Mengxing; Brenig, Wolfram; Perkins, Natalia B.

doi:10.1103/PhysRevB.109.144415

Fractionalized excitations probed by ultrasound

Journal Article · Thu Apr 18 00:00:00 EDT 2024 · Physical Review. B

DOI:https://doi.org/10.1103/PhysRevB.109.144415· OSTI ID:2895865

Hauspurg, A. ^[1]; ^[2]; ^[2]; Felea, V. ^[2]; Wosnitza, J. ^[1]; Tsurkan, V. ^[3]; ^[4]; ^[5]; Ye, Mengxing ^[6]; Brenig, Wolfram ^[7]; Perkins, Natalia B. ^[8]

Helmholtz-Zentrum Dresden-Rossendorf (HZDR) (Germany); Technische Universität Dresden (Germany)
Helmholtz-Zentrum Dresden-Rossendorf (HZDR) (Germany)
University of Augsburg (Germany); Moldova State University, Chisinau (Moldova, Republic of)
Sungkyunkwan University, Suwon (Korea, Republic of)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
University of California, Santa Barbara, CA (United States); University of Utah, Salt Lake City, UT (United States)
Technical University Braunschweig (Germany)
University of Minnesota, Minneapolis, MN (United States); Technical University of Munich, Garching (Germany)

In this work, we study magnetoelastic interactions by means of ultrasound experiments in 𝛼−RuCl₃ —a prototypical material for the Kitaev spin model on the honeycomb lattice, with a possible spin-liquid state featuring Majorana fermions and ℤ₂-flux excitations. We present results of the temperature and in-plane magnetic-field dependence of the sound velocity and sound attenuation for several longitudinal and transverse phonon modes propagating along high-symmetry crystallographic directions. A comprehensive data analysis above the magnetically ordered state provides strong evidence of phonon scattering by Majorana fermions. This scattering depends sensitively on the value of the phonon velocities relative to the characteristic velocity of the low-energy fermionic excitations describing the spin dynamics of the underlying Kitaev magnet. Moreover, our data displays a distinct reduction of anisotropy of the sound attenuation, consistent with the presence of thermally excited ℤ₂ visons. Here, we demonstrate the potential of phonon dynamics as a promising probe for uncovering fractionalized excitations in 𝛼−RuCl₃ and provide new insights into the 𝐻−𝑇 phase diagram of this material.

View Accepted Manuscript (DOE)

Research Organization:: University of Minnesota, Minneapolis, MN (United States)

Sponsoring Organization:: National Research Foundation (NRF) of Korea; National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0018056

OSTI ID:: 2895865

Alternate ID(s):: OSTI ID: 2474097

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 14 Vol. 109; ISSN 2469-9969; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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