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 04:00:00 UTC 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

OSTI ID:: 1412040

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

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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