Nanoscale Polar Landscapes in Quantum Paraelectric SrTiO3

Abstract

SrTiO3 is a textbook quantum paraelectric, with ferroelectricity purportedly suppressed by quantum fluctuations of ionic positions down to the lowest temperatures. The precise real space structure of SrTiO3 at low temperature, however, has remained undefined despite decades of study. Here we directly image the low-temperature polar structure of quantum parelectric SrTiO3, using cryogenic scanning transmission electron microscopy down to 20 K. High resolution imaging reveals a spatially fluctuating landscape of nanoscale domains of finite polarization. The short-range polar domains first grow and self-organize into a periodic structure over tens of nanometers. However, the process reverses when entering the quantum paraelectric regime below 40 K and the periodically ordered polar nanodomains fragment into small clusters.

References in corpus (9)

• Terahertz-Field-Induced Ferroelectricity in Quantum Paraelectric SrTiO${}_3$
• Metastable ferroelectricity in optically strained $SrTi{O}_3$
• Terahertz electric-field driven dynamical multiferroicity in SrTiO${}_3$
• Very-High Dynamic Range, 10,000 frames/second Pixel Array Detector for Electron Microscopy
• Order-Disorder Ferroelectric Transition of Strained SrTiO3
• Mesoscopic tunneling in strontium titanate
• Ultra-Cold Cryogenic TEM with Liquid Helium and High Stability
• Lamellar fluctuations melt ferroelectricity
• Inverse Melting of Polar Order in Chemically Substituted BaTiO3