Effect of symmetry breaking on short-wavelength acoustic phonons in the chiral magnet MnSi

Y. Nii; Y. Hirokane; T. Koretsune; D. Ishikawa; A. Q.R. Baron; Y. Onose

doi:10.1103/PhysRevB.104.L081101

Effect of symmetry breaking on short-wavelength acoustic phonons in the chiral magnet MnSi

Y. Nii, Y. Hirokane, T. Koretsune, D. Ishikawa, A. Q.R. Baron, Y. Onose

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Abstract

We have investigated the effects of spatial-inversion and time-reversal symmetry breaking on the acoustic phonon branches in chiral MnSi using high-resolution inelastic x-ray scattering and first-principles calculations. We find a momentum-transfer-dependent (q-dependent) splitting between transverse phonon bands having angular momentum parallel or antiparallel to q. This is understood by a phenomenological theory using a gyrotropic tensor. We observed no significant impact from the time-reversal symmetry breaking induced by a magnetic field (energy shifts < 0.3 meV). This suggests the effect of time-reversal symmetry breaking is small or is restricted to a very-low-energy regime in this material, possibly due to small spin-orbit interaction.

Original language	English
Article number	L081101
Journal	Physical Review B
Volume	104
Issue number	8
DOIs	https://doi.org/10.1103/PhysRevB.104.L081101
Publication status	Published - 2021 Aug 15

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10.1103/PhysRevB.104.L081101

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title = "Effect of symmetry breaking on short-wavelength acoustic phonons in the chiral magnet MnSi",

abstract = "We have investigated the effects of spatial-inversion and time-reversal symmetry breaking on the acoustic phonon branches in chiral MnSi using high-resolution inelastic x-ray scattering and first-principles calculations. We find a momentum-transfer-dependent (q-dependent) splitting between transverse phonon bands having angular momentum parallel or antiparallel to q. This is understood by a phenomenological theory using a gyrotropic tensor. We observed no significant impact from the time-reversal symmetry breaking induced by a magnetic field (energy shifts < 0.3 meV). This suggests the effect of time-reversal symmetry breaking is small or is restricted to a very-low-energy regime in this material, possibly due to small spin-orbit interaction.",

author = "Y. Nii and Y. Hirokane and T. Koretsune and D. Ishikawa and Baron, {A. Q.R.} and Y. Onose",

note = "Funding Information: We thank Y. Tomioka for the help with crystal growth. This work is supported by JSPS KAKENHI (Grants No. JP18K13494 and No. JP20K03828), PRESTO (Grant No. JPMJPR19L6), and the Mitsubishi Foundation. The phonon measurements were performed at BL43LXU of the RIKEN SPring-8 Center. Publisher Copyright: {\textcopyright} 2021 American Physical Society.",

year = "2021",

month = aug,

day = "15",

doi = "10.1103/PhysRevB.104.L081101",

language = "English",

volume = "104",

journal = "Physical Review B",

issn = "2469-9950",

publisher = "American Physical Society",

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T1 - Effect of symmetry breaking on short-wavelength acoustic phonons in the chiral magnet MnSi

AU - Nii, Y.

AU - Hirokane, Y.

AU - Koretsune, T.

AU - Ishikawa, D.

AU - Baron, A. Q.R.

AU - Onose, Y.

N1 - Funding Information: We thank Y. Tomioka for the help with crystal growth. This work is supported by JSPS KAKENHI (Grants No. JP18K13494 and No. JP20K03828), PRESTO (Grant No. JPMJPR19L6), and the Mitsubishi Foundation. The phonon measurements were performed at BL43LXU of the RIKEN SPring-8 Center. Publisher Copyright: © 2021 American Physical Society.

PY - 2021/8/15

Y1 - 2021/8/15

N2 - We have investigated the effects of spatial-inversion and time-reversal symmetry breaking on the acoustic phonon branches in chiral MnSi using high-resolution inelastic x-ray scattering and first-principles calculations. We find a momentum-transfer-dependent (q-dependent) splitting between transverse phonon bands having angular momentum parallel or antiparallel to q. This is understood by a phenomenological theory using a gyrotropic tensor. We observed no significant impact from the time-reversal symmetry breaking induced by a magnetic field (energy shifts < 0.3 meV). This suggests the effect of time-reversal symmetry breaking is small or is restricted to a very-low-energy regime in this material, possibly due to small spin-orbit interaction.

AB - We have investigated the effects of spatial-inversion and time-reversal symmetry breaking on the acoustic phonon branches in chiral MnSi using high-resolution inelastic x-ray scattering and first-principles calculations. We find a momentum-transfer-dependent (q-dependent) splitting between transverse phonon bands having angular momentum parallel or antiparallel to q. This is understood by a phenomenological theory using a gyrotropic tensor. We observed no significant impact from the time-reversal symmetry breaking induced by a magnetic field (energy shifts < 0.3 meV). This suggests the effect of time-reversal symmetry breaking is small or is restricted to a very-low-energy regime in this material, possibly due to small spin-orbit interaction.

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JO - Physical Review B

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Effect of symmetry breaking on short-wavelength acoustic phonons in the chiral magnet MnSi

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