Excitations in the field-induced quantum spin liquid state of α-RuCl3

Banerjee, Arnab; Kelley, Paula J.; Knolle, Johannes; Balz, Christian; Aczel, Adam A.; Winn, Barry L.; Liu, Yaohua; Pajerowski, Daniel M.; Yan, Jiaqiang; Bridges, Craig A.; Savici, Andrei T.; Chakoumakos, Bryan C.; Lumsden, Mark D.; Tennant, David Alan; Moessner, Roderich; Mandrus, David; Nagler, Stephen E.

doi:10.1038/s41535-018-0079-2

Title: Excitations in the field-induced quantum spin liquid state of α-RuCl₃

Journal Article · Tue Feb 20 00:00:00 EST 2018 · npj Quantum Materials

DOI:https://doi.org/10.1038/s41535-018-0079-2· OSTI ID:1423077

Banerjee, Arnab ^[1]; Kelley, Paula J. ^[2]; Knolle, Johannes ^[3]; Balz, Christian ^[1]; Aczel, Adam A. ^[1]; Winn, Barry L. ^[1]; Liu, Yaohua ^[1]; Pajerowski, Daniel M. ^[1]; Yan, Jiaqiang ^[2]; Bridges, Craig A. ^[4]; Savici, Andrei T. ^[5]; Chakoumakos, Bryan C. ^[1]; Lumsden, Mark D. ^[1]; Tennant, David Alan ^[1]; Moessner, Roderich ^[6]; Mandrus, David ^[2]; Nagler, Stephen E. ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
Univ. of Cambridge (United Kingdom). Cavendish Lab., Dept. of Physics
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Data Analysis and Visualization Division
Max Planck Inst. for the Physics of Complex Systems, Dresden (Germany)

The celebrated Kitaev quantum spin liquid (QSL) is the paradigmatic example of a topological magnet with emergent excitations in the form of Majorana Fermions and gauge fluxes. Upon breaking of time-reversal symmetry, for example in an external magnetic field, these fractionalized quasiparticles acquire non-Abelian exchange statistics, an important ingredient for topologically protected quantum computing. Consequently, there has been enormous interest in exploring possible material realizations of Kitaev physics and several candidate materials have been put forward, recently including α-RuCl₃. In the absence of a magnetic field this material orders at a finite temperature and exhibits low-energy spin wave excitations. However, at moderate energies, the spectrum is unconventional and the response shows evidence for fractional excitations. Here in this paper, we use time-of-flight inelastic neutron scattering to show that the application of a sufficiently large magnetic field in the honeycomb plane suppresses the magnetic order and the spin waves, leaving a gapped continuum spectrum of magnetic excitations. Our comparisons of the scattering to the available calculations for a Kitaev QSL show that they are consistent with the magnetic field induced QSL phase.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; 703697; GBMF4416

OSTI ID:: 1423077

Journal Information:: npj Quantum Materials, Vol. 3, Issue 1; ISSN 2397-4648

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 235 works

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Title: Excitations in the field-induced quantum spin liquid state of α-RuCl₃