Two-dimensional limit of crystalline order in perovskite membrane films.

ABSTRACT: 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 c

SUBMITTER: Hong SS 

PROVIDER: S-EPMC5696264 | biostudies-literature | 2017 Nov

REPOSITORIES: biostudies-literature