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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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Alterpiezoresponse in Two-Dimensional Lieb-Lattice Altermagnets.

Xilong Xu1, Li Yang1,2

  • 1Department of Physics, Washington University in St. Louis, St. Louis, Missouri 63130, United States.

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|July 25, 2025
PubMed
Summary
This summary is machine-generated.

Researchers discovered new altermagnetic materials, M2WS4, exhibiting unique piezomagnetic and piezoelectric effects. These materials allow independent control of magnetic and electric properties for advanced applications.

Keywords:
Lieb latticesaltermagnetismpiezoelectric effectpiezomagnetic effect

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid State Chemistry

Background:

  • Altermagnetism, characterized by alternating spin structures in reciprocal space, is an emerging field of significant scientific interest.
  • Transition-metal chalcogenides M2WS4, based on Lieb lattices, represent a novel class of altermagnetic materials.
  • Understanding the interplay between crystal symmetry and magnetic/electric responses is crucial for novel material functionalities.

Purpose of the Study:

  • To predict and investigate novel real-space alternative piezomagnetic and piezoelectric responses in M2WS4 altermagnets.
  • To elucidate the role of unique crystal-spin symmetry (S4T) in dictating distinct magnetic and electric behaviors under stress.
  • To explore the potential of these materials for independent control of electric and magnetic properties.

Main Methods:

  • Theoretical prediction of piezomagnetic and piezoelectric effects in M2WS4 compounds.
  • Analysis of crystal-spin symmetry (S4T) and its influence on material responses.
  • Investigation of responses under different stress conditions (axial vs. diagonal).

Main Results:

  • Axial stress induces a giant piezomagnetic response (1-2 orders of magnitude larger than conventional materials) due to S4T symmetry.
  • Residual C2 symmetry suppresses the piezoelectric effect under axial stress.
  • Diagonal stress leads to a significant piezoelectric response by creating electric dipole moment imbalance, while inhibiting piezomagnetism due to in-plane mirror symmetry.

Conclusions:

  • M2WS4 altermagnets exhibit an alternative piezoresponse, enabling independent control of electric and magnetic properties.
  • This unique property opens new avenues for developing high-fidelity multifunctional memory and sensor applications.
  • The findings highlight the potential of altermagnetic materials in next-generation electronic devices.