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Magnetically Induced Rotating Rayleigh-Taylor Instability
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Spiral spin liquid noise.

Hiroto Takahashi1, Chun-Chih Hsu1, Fabian Jerzembeck1,2

  • 1Department of Physics, Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, United Kingdom.

Proceedings of the National Academy of Sciences of the United States of America
|March 18, 2025
PubMed
Summary
This summary is machine-generated.

Researchers used spin noise spectroscopy to study Ca10Cr7O28, identifying it as a spiral spin liquid (SSL). This technique analyzes spontaneous spin fluctuations to understand exotic magnetic states in materials.

Keywords:
quantum spin liquidspin noise spectroscopyspiral spin liquid

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials
  • Magnetism

Background:

  • Identifying exotic quantum states like spin liquids is crucial in condensed matter physics.
  • Spontaneous spin noise has emerged as a promising technique for characterizing spin liquids.
  • Ca10Cr7O28 is a material candidate for exhibiting spin liquid behavior, potentially quantum or spiral.

Purpose of the Study:

  • To develop and apply spin noise spectroscopy for the investigation of Ca10Cr7O28.
  • To determine whether Ca10Cr7O28 is a quantum spin liquid or a spiral spin liquid (SSL).
  • To analyze the time and temperature dependence of spin fluctuations in Ca10Cr7O28.

Main Methods:

  • Enhanced spin noise spectroscopy, building upon techniques used for magnetic monopole noise studies.
  • Measurement of spontaneous flux and magnetization in Ca10Cr7O28 samples over time and temperature.
  • Analysis of the power spectral density, variance, and correlation function of magnetization noise.

Main Results:

  • Intense spin fluctuations were observed in Ca10Cr7O28, characterized by specific frequency and temperature dependencies.
  • Crossovers in the noise variance and correlation function were detected at a characteristic temperature.
  • Experimental results showed quantitative agreement with Monte-Carlo simulations of a 2D SSL state.

Conclusions:

  • The observed spin noise phenomenology is inconsistent with predictions for quantum spin liquids.
  • The findings strongly indicate that Ca10Cr7O28 is a two-dimensional spiral spin liquid (SSL).
  • Spin noise spectroscopy proves to be an effective tool for identifying and characterizing SSL states.