Low-energy magnon dynamics and magneto-optics of the skyrmionic Mott insulator Cu2OSeO3

Laurita, N. J.; Marcus, G. G.; Trump, B. A.; Kindervater, J.; Stone, M. B.; McQueen, T. M.; Broholm, C. L.; Armitage, N. P.

doi:10.1103/PhysRevB.95.235155

Title: Low-energy magnon dynamics and magneto-optics of the skyrmionic Mott insulator ${Cu}_{2} {OSeO}_{3}$

Journal Article · Thu Jun 29 00:00:00 EDT 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.95.235155· OSTI ID:1474719

Laurita, N. J. ^[1]; Marcus, G. G. ^[1]; Trump, B. A. ^[2]; Kindervater, J. ^[1]; Stone, M. B. ^[3]; McQueen, T. M. ^[4]; Broholm, C. L. ^[5]; Armitage, N. P. ^[1]

Johns Hopkins Univ., Baltimore, MD (United States). Inst. for Quantum Matter. Dept. of Physics and Astronomy
Johns Hopkins Univ., Baltimore, MD (United States). Inst. for Quantum Matter. Dept. of Physics and Astronomy. Dept. of Chemistry
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
Johns Hopkins Univ., Baltimore, MD (United States). Inst. for Quantum Matter. Dept. of Physics and Astronomy. Dept. of Chemistry. Dept. of Materials Science and Engineering
Johns Hopkins Univ., Baltimore, MD (United States). Inst. for Quantum Matter. Dept. of Physics and Astronomy. Dept. of Materials Science and Engineering

In this study, we present a comprehensive study of the low-energy optical magnetic response of the skyrmionic Mott insulator ${Cu}_{2} {OSeO}_{3}$ via high resolution time-domain THz spectroscopy. In zero field, a new magnetic excitation ( $f_{0} = 2.03 THz$ ) which has not been predicted by spin-wave theory is observed and shown, with accompanying time-of-flight neutron scattering experiments, to be a zone folded magnon from the $R$ to $Γ$ points of the Brillouin zone. Highly sensitive polarimetry experiments performed in weak magnetic fields, $μ_{0} H < 200 mT$ , observe Faraday and Kerr rotations which are proportional to the sample magnetization, allowing for optical detection of the skyrmion phase and construction of a magnetic phase diagram. From these measurements, we extract a critical exponent of $β = 0.35 \pm 0.04$ , in good agreement with the expected value for the 3D Heisenberg universality class of $β = 0.367$ . In large magnetic fields, $μ_{0} H > 5 T$ , we observe the magnetically active uniform mode of the ferrimagnetic field polarized phase whose dynamics as a function of field and temperature are studied. In addition to extracting a $g_{eff} = 2.08 \pm 0.03$ , we observe the uniform mode to decay through a non-Gilbert damping mechanism and to possess a finite spontaneous decay rate, $Γ_{0} \approx 25 GHz$ , in the zero temperature limit. Finally, our observations are attributed to Dzyaloshinkii-Moriya interactions, which have been proposed to be exceptionally strong in ${Cu}_{2} {OSeO}_{3}$ and are expected to impact the low-energy magnetic response of such chiral magnets.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Johns Hopkins Univ., Baltimore, MD (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); ARCS Foundation (United States)

Grant/Contract Number:: AC05-00OR22725; FG02-08ER46544; DGE-1232825

OSTI ID:: 1474719

Alternate ID(s):: OSTI ID: 1372525

Journal Information:: Physical Review B, Vol. 95, Issue 23; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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Title: Low-energy magnon dynamics and magneto-optics of the skyrmionic Mott insulator Cu 2 OSeO 3

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Title: Low-energy magnon dynamics and magneto-optics of the skyrmionic Mott insulator ${Cu}_{2} {OSeO}_{3}$