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Dielectric Relaxation by Quantum Critical Magnons.

Daniel Flavián1, Pavel A Volkov2,3,4, S Hayashida1

  • 1Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland.

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|June 9, 2023
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Summary
This summary is machine-generated.

We observed dielectric relaxation driven by quantum critical magnons. This reveals the electrical activity of coupled spin and lattice excitations, demonstrating quantum multiferroic behavior.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Magnetism
  • Materials Science

Background:

  • Dielectric relaxation is a key phenomenon in materials, often influenced by lattice and spin dynamics.
  • Quantum critical points (QCPs) in magnetic systems exhibit unique fluctuations with potential for novel physical properties.
  • Understanding the interplay between magnetic, lattice, and electrical properties is crucial for developing advanced materials.

Purpose of the Study:

  • To experimentally observe and characterize dielectric relaxation mediated by quantum critical magnons.
  • To investigate the relationship between magnetic field, temperature, and dielectric properties near a magnetic QCP.
  • To demonstrate the electrical activity arising from coupled spin and lattice excitations, indicative of quantum multiferroic behavior.

Main Methods:

  • Complex capacitance measurements were performed to probe dielectric properties.
  • Experiments were conducted across a range of temperatures and magnetic fields, focusing on a field-tuned magnetic QCP.
  • Analysis involved characterizing the temperature dependence of dissipative features and the activation behavior of relaxation times.

Main Results:

  • A distinct dissipative feature in dielectric response was observed, linked to low-energy lattice excitations.
  • The relaxation time exhibited activation behavior, with the activation energy softening near the QCP (H=Hc).
  • Above the QCP (H>Hc), the activation energy was found to follow single-magnon energy, confirming its magnetic origin.

Conclusions:

  • The study experimentally confirms dielectric relaxation driven by quantum critical magnons.
  • It demonstrates the electrical activity of coupled low-energy spin and lattice excitations.
  • This work provides a clear example of quantum multiferroic behavior in the studied system.