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Title: Two-dimensional limit of crystalline order in perovskite membrane films

Journal Article · · Science Advances
ORCiD logo [1];  [2];  [2];  [3];  [4]; ORCiD logo [1]; ORCiD logo [1]
  1. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  2. Stanford Univ., Stanford, CA (United States)
  3. Stanford Nano Shared Facilities, Stanford, CA (United States)
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States)

Long-range order and phase transitions in two-dimensional (2D) systems—such as magnetism, superconductivity, and crystallinity—have been important research topics for decades. The issue of 2D crystalline order has reemerged recently, with the development of exfoliated atomic crystals. Understanding the dimensional limit of crystalline phases, with different types of bonding and synthetic techniques, is at the foundation of low-dimensional materials design. We study ultrathin membranes of SrTiO3, an archetypal perovskite oxide with isotropic (3D) bonding. Atomically controlled membranes are released after synthesis by dissolving an underlying epitaxial layer. Although all unreleased films are initially single-crystalline, the SrTiO3 membrane lattice collapses below a critical thickness (5 unit cells). This crossover from algebraic to exponential decay of the crystalline coherence length is analogous to the 2D topological Berezinskii-Kosterlitz-Thouless (BKT) transition. Finally, the transition is likely driven by chemical bond breaking at the 2D layer-3D bulk interface, defining an effective dimensional phase boundary for coherent crystalline lattices.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
award357195; Stanford Nano Shared Facilities (SNSF), Award ECCS-1542152; award342082; AC02-76SF00515; award342083; GBMF4415
OSTI ID:
1419318
Journal Information:
Science Advances, Vol. 3, Issue 11; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 84 works
Citation information provided by
Web of Science

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Cited By (10)

Hydrogenation Dynamics of Electrically Controlled Metal–Insulator Transition in Proton‐Gated Transparent and Flexible WO 3 Transistors journal June 2019
Synergetic Behavior in 2D Layered Material/Complex Oxide Heterostructures journal December 2018
Ferroelectric Domain Wall Motion in Freestanding Single‐Crystal Complex Oxide Thin Film journal December 2019
Giant Uniaxial Strain Ferroelectric Domain Tuning in Freestanding PbTiO 3 Films journal April 2020
Freestanding crystalline oxide perovskites down to the monolayer limit journal June 2019
Self-assembled multiferroic perovskite–spinel nanocomposite thin films: epitaxial growth, templating and integration on silicon journal January 2019
Non-Ohmic conduction in exfoliated La 0.7 Ca 0.3 MnO 3 thin films journal January 2020
Wrinkle-free atomically thin CdS nanosheets for photocatalytic hydrogen evolution journal March 2018
Freestanding crystalline YB a 2 C u 3 O 7 − x heterostructure membranes journal June 2019
Synergetic Behavior in 2D Layered Material/Complex Oxide Heterostructures text January 2019

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