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A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
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Dynamic Multiferroicity of a Ferroelectric Quantum Critical Point.

K Dunnett1, J-X Zhu2, N A Spaldin3

  • 1Nordita, KTH Royal Institute of Technology and Stockholm University, Roslagstullsbacken 23, SE-106 91 Stockholm, Sweden.

Physical Review Letters
|March 2, 2019
PubMed
Summary
This summary is machine-generated.

Quantum critical points in ferroelectrics exhibit enhanced magnetic responses due to entangled fluctuations. This suggests all ferroelectric quantum critical points are inherently multiferroic, observable in materials like strontium titanate.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials Science

Background:

  • Quantum matter exhibits diverse phases, often with coexisting or competing orders.
  • Entangled orders are difficult to separate, as seen in dynamical multiferroicity where electric dipole fluctuations induce magnetization.

Purpose of the Study:

  • To demonstrate an enhanced magnetic response in ferroelectrics near a ferroelectric quantum critical point (FE QCP).
  • To propose that any FE QCP is intrinsically a multiferroic quantum critical point.

Main Methods:

  • Theoretical calculation of magnetic susceptibility near the FE QCP.
  • Identification of a region with enhanced magnetic signatures controlled by the ferroelectric tuning parameter.

Main Results:

  • An elevated magnetic response is observed near the FE QCP due to entangled ferroelectric and magnetic fluctuations.
  • A specific region exhibiting enhanced magnetic signatures is identified and characterized.

Conclusions:

  • Ferroelectric quantum critical points are inherently multiferroic quantum critical points.
  • Quantum paraelectric strontium titanate is proposed as a candidate material to observe these effects, with predicted induced magnetic moments of ~5x10^-7 μB per unit cell.