Antiferromagnetic Resonance and Terahertz Continuum in α-RuCl3

Little, A.; Wu, Liang; Lampen-Kelley, P.; Banerjee, A.; Patankar, S.; Rees, D.; Bridges, C. A.; Yan, J. -Q.; Mandrus, D.; Nagler, S. E.; Orenstein, J.

doi:10.1103/PhysRevLett.119.227201

Title: Antiferromagnetic Resonance and Terahertz Continuum in $α - {RuCl}_{3}$

Journal Article · Tue Nov 28 00:00:00 EST 2017 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.119.227201· OSTI ID:1412040

Little, A. ^[1]; Wu, Liang ^[2]; Lampen-Kelley, P. ^[3]; Banerjee, A. ^[4]; Patankar, S. ^[1]; Rees, D. ^[1]; Bridges, C. A. ^[4]; Yan, J. -Q. ^[4]; Mandrus, D. ^[3]; Nagler, S. E. ^[5]; Orenstein, J. ^[1]

Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of Pennsylvania, Philadelphia, PA (United States)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

We report measurements of optical absorption in the zigzag antiferromagnet α-RuCl₃ as a function of temperature T , magnetic field B , and photon energy ℏ ω in the range ~ 0.3 –8.3 meV, using time-domain terahertz spectroscopy. Polarized measurements show that threefold rotational symmetry is broken in the honeycomb plane from 2 to 300 K. We find a sharp absorption peak at 2.56 meV upon cooling below the Néel temperature of 7 K at B = 0 that we identify as the magnetic-dipole excitation of a zero-wave-vector magnon, or antiferromagnetic resonance (AFMR). With the application of B , the AFMR broadens and shifts to a lower frequency as long-range magnetic order is lost in a manner consistent with transitioning to a spin-disordered phase. From a direct, internally calibrated measurement of the AFMR spectral weight, we place an upper bound on the contribution to the dc susceptibility from a magnetic excitation continuum.

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725; AC02-76SF00515

OSTI ID:: 1412040

Alternate ID(s):: OSTI ID: 1410485

Journal Information:: Physical Review Letters, Vol. 119, Issue 22; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 75 works

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Quasi-degenerate magnetic states in α-RuCl ₃ Yang, Huan-Cheng; Gong, Ben-Chao; Liu, Kai Journal of Physics: Condensed Matter, Vol. 31, Issue 2 https://doi.org/10.1088/1361-648x/aaeeac	journal	December 2018
Unconventional spin dynamics in the honeycomb-lattice material $α − {RuCl}_{3}$ : High-field electron spin resonance studies Ponomaryov, A. N.; Schulze, E.; Wosnitza, J. Physical Review B, Vol. 96, Issue 24 https://doi.org/10.1103/physrevb.96.241107	journal	December 2017
Field-induced magnon excitation and in-gap absorption in the Kitaev candidate ${RuCl}_{3}$ Shi, L. Y.; Liu, Y. Q.; Lin, T. Physical Review B, Vol. 98, Issue 9 https://doi.org/10.1103/physrevb.98.094414	journal	September 2018
Field evolution of magnons in $α − {RuCl}_{3}$ by high-resolution polarized terahertz spectroscopy Wu, Liang; Little, A.; Aldape, E. E. Physical Review B, Vol. 98, Issue 9 https://doi.org/10.1103/physrevb.98.094425	journal	September 2018
Signatures of low-energy fractionalized excitations in $α − {RuCl}_{3}$ from field-dependent microwave absorption Wellm, C.; Zeisner, J.; Alfonsov, A. Physical Review B, Vol. 98, Issue 18 https://doi.org/10.1103/physrevb.98.184408	journal	November 2018
Sawtooth Torque in Anisotropic j eff = 1 / 2 Magnets: Application to α − RuCl 3 Riedl, Kira; Li, Ying; Winter, Stephen M. Physical Review Letters, Vol. 122, Issue 19 https://doi.org/10.1103/physrevlett.122.197202	journal	May 2019
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