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Phonon Magnetochiral Effect.

T Nomura1, X-X Zhang2,3, S Zherlitsyn1

  • 1Hochfeld-Magnetlabor Dresden (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany.

Physical Review Letters
|May 4, 2019
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Summary
This summary is machine-generated.

Researchers demonstrated the magnetochiral effect (MCE) in phonons within a specific magnetic material. Ultrasound experiments showed sound velocity changes with magnetic field direction, confirming MCE in chiral crystals.

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Area of Science:

  • Condensed Matter Physics
  • Solid-State Acoustics
  • Magnetism

Background:

  • The magnetochiral effect (MCE) describes nonreciprocal wave propagation influenced by magnetic fields and material chirality.
  • Understanding MCE in acoustic systems is crucial for exploring novel phononic phenomena.

Purpose of the Study:

  • To experimentally demonstrate the magnetochiral effect (MCE) of phonons.
  • To investigate the influence of magnetic fields and crystal chirality on acoustic wave propagation.
  • To elucidate the underlying mechanism responsible for the observed MCE.

Main Methods:

  • High-resolution ultrasound experiments were conducted.
  • Measurements of sound velocity were performed under varying magnetic field orientations.
  • Analysis focused on the nonreciprocity of acoustic propagation in chiral magnetic materials.

Main Results:

  • The magnetochiral effect (MCE) of phonons was successfully demonstrated in the chiral-lattice ferrimagnet Cu_{2}OSeO_{3}.
  • A distinct difference in sound velocity was observed for parallel and antiparallel acoustic propagation relative to the external magnetic field.
  • The sign of the nonreciprocity was found to be dependent on the crystal's chirality, aligning with MCE selection rules.
  • Enhanced nonreciprocity was noted below the magnetic ordering temperature and at higher ultrasound frequencies.

Conclusions:

  • The study confirms the existence of the magnetochiral effect for phonons in magnetic materials.
  • A magnon-phonon hybridization mechanism is proposed and quantitatively explains the observed MCE, particularly its temperature and frequency dependence.
  • Findings provide insights into the interplay between magnetism, crystal structure, and acoustic properties.