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Updated: Jan 14, 2026

Characterization of Full Set Material Constants and Their Temperature Dependence for Piezoelectric Materials Using Resonant Ultrasound Spectroscopy

Characterization of Full Set Material Constants and Their Temperature Dependence for Piezoelectric Materials Using Resonant Ultrasound Spectroscopy

Published on: April 27, 2016

Quantum critical electro-optic and piezo-electric nonlinearities.

Christopher P Anderson^1,2, Giovanni Scuri¹, Aaron Chan³

¹E. L. Ginzton Laboratory, Stanford University, Stanford, CA, USA.

Science (New York, N.Y.)

|October 23, 2025

Summary

Researchers discovered strontium titanate (SrTiO3) as a highly efficient material for cryogenic electro-optic (EO) and piezoelectric applications. Tuning it near quantum criticality significantly enhances these properties for advanced optical and mechanical systems.

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Area of Science:

Materials Science
Quantum Physics
Photonics

Background:

Electro-optic (EO) nonlinearities are crucial for photonics but challenging in cryogenic environments.
Phase transitions are linked to material nonlinearity, suggesting potential for new discoveries.

Purpose of the Study:

To identify and characterize efficient cryogenic nonlinear optical materials.
To explore the relationship between quantum phase transitions and nonlinear optical properties.

Main Methods:

Investigated strontium titanate (SrTiO3), a quantum paraelectric perovskite, at cryogenic temperatures (T = 5 K).
Measured EO and piezoelectric coefficients at frequencies up to 1 megahertz.
Tuned SrTiO3 towards quantum criticality to enhance nonlinear effects.

Main Results:

Identified SrTiO3 as a strong cryogenic EO material (>500 pm/V) and piezoelectric material (>90 pC/N) at 5 K.
Achieved a linear Pockels coefficient exceeding 1000 pm/V by tuning SrTiO3 toward quantum criticality.
Demonstrated significantly enhanced EO and piezoelectric effects near quantum critical points.

Conclusions:

SrTiO3 exhibits exceptional nonlinear properties at cryogenic temperatures, especially near quantum criticality.
This work links quantum phase transitions, dielectric susceptibility, and nonlinearity.
Unlocks opportunities for advanced cryogenic optical and mechanical systems and provides a materials discovery framework.