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Ferroelectricity in [111]-oriented epitaxially strained SrTiO3 from first principles

Journal Article · · Physical Review Materials
 [1];  [2];  [3]
  1. Univ. Andres Bello, Santiago (Chile). Dept. de Ciencias Fisicas; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Foundry; Univ. of California, Berkeley, CA (United States). Dept. of Physics
  2. Rutgers Univ., Piscataway, NJ (United States). Dept. of Physics and Astronomy
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Foundry; Univ. of California, Berkeley, CA (United States). Dept. of Physics; Kavli Energy NanoSciences Inst. at Berkeley, Berkeley, CA (United States)
We use first-principles density-functional theory calculations to investigate the effect of biaxial strain in the low-temperature structural and ferroelectric properties of [111]-oriented SrTiO3. In this work we find that [111] biaxial strain, achievable by coherent epitaxial growth along the [111] direction, induces structural distortions in SrTiO3 that are not present in either bulk or [001]-oriented SrTiO3. Under [111] biaxial strain, SrTiO3 displays ferroelectricity at tensile strain, and paraelectricity at compressive strain. We compute the phonon spectrum and macroscopic polarization of SrTiO3 as a function of [111] biaxial strain, and relate our results to the predictions of the free-energy phenomenological model of Pertsev, Tagantsev, and Setter
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC) and The Molecular Foundry (TMF)
Sponsoring Organization:
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT); US Department of the Navy, Office of Naval Research (ONR); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1530593
Alternate ID(s):
OSTI ID: 1546178
Journal Information:
Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 3 Vol. 3; ISSN PRMHAR; ISSN 2475-9953
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Systematic trends in YAlO 3 , SrTiO 3 , BaTiO 3 , BaZrO 3 (001) and (111) surface ab initio calculations journal December 2019

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