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A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
Published on: April 8, 2018
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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
Summary
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.
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.
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