Low-Temperature Dielectric Anisotropy Driven by an Antiferroelectric Mode in SrTiO3

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Low-Temperature Dielectric Anisotropy Driven by an Antiferroelectric Mode in SrTiO3. / Casals, Blai; Schiaffino, Andrea; Casiraghi, Arianna; Hämäläinen, Sampo J.; López González, Diego; Van Dijken, Sebastiaan; Stengel, Massimiliano; Herranz, Gervasi.

julkaisussa: Physical Review Letters, Vuosikerta 120, Nro 21, 217601, 25.05.2018, s. 1-6.

Tutkimustuotos: Lehtiartikkelivertaisarvioitu

Harvard

Casals, B, Schiaffino, A, Casiraghi, A, Hämäläinen, SJ, López González, D, Van Dijken, S, Stengel, M & Herranz, G 2018, 'Low-Temperature Dielectric Anisotropy Driven by an Antiferroelectric Mode in SrTiO3' Physical Review Letters, Vuosikerta. 120, Nro 21, 217601, Sivut 1-6. https://doi.org/10.1103/PhysRevLett.120.217601

APA

Vancouver

Author

Casals, Blai ; Schiaffino, Andrea ; Casiraghi, Arianna ; Hämäläinen, Sampo J. ; López González, Diego ; Van Dijken, Sebastiaan ; Stengel, Massimiliano ; Herranz, Gervasi. / Low-Temperature Dielectric Anisotropy Driven by an Antiferroelectric Mode in SrTiO3. Julkaisussa: Physical Review Letters. 2018 ; Vuosikerta 120, Nro 21. Sivut 1-6.

Bibtex - Lataa

@article{d84198f06d9945c0a15f58258795a548,
title = "Low-Temperature Dielectric Anisotropy Driven by an Antiferroelectric Mode in SrTiO3",
abstract = "Strontium titanate (SrTiO3) is the quintessential material for oxide electronics. One of its hallmark features is the transition, driven by antiferrodistortive (AFD) lattice modes, from a cubic to a ferroelastic low-temperature phase. Here we investigate the evolution of the ferroelastic twin walls upon application of an electric field. Remarkably, we find that the dielectric anisotropy of tetragonal SrTiO3, rather than the intrinsic domain wall polarity, is the main driving force for the motion of the twins. Based on a combined first-principles and Landau-theory analysis, we show that such anisotropy is dominated by a trilinear coupling between the polarization, the AFD lattice tilts, and a previously overlooked antiferroelectric (AFE) mode. We identify the latter AFE phonon with the so-called {"}R mode{"} at ∼440 cm-1, which was previously detected in IR experiments, but whose microscopic nature was unknown.",
author = "Blai Casals and Andrea Schiaffino and Arianna Casiraghi and H{\"a}m{\"a}l{\"a}inen, {Sampo J.} and {L{\'o}pez Gonz{\'a}lez}, Diego and {Van Dijken}, Sebastiaan and Massimiliano Stengel and Gervasi Herranz",
note = "| openaire: EC/FP7/307502/EU//E-CONTROL",
year = "2018",
month = "5",
day = "25",
doi = "10.1103/PhysRevLett.120.217601",
language = "English",
volume = "120",
pages = "1--6",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "21",

}

RIS - Lataa

TY - JOUR

T1 - Low-Temperature Dielectric Anisotropy Driven by an Antiferroelectric Mode in SrTiO3

AU - Casals, Blai

AU - Schiaffino, Andrea

AU - Casiraghi, Arianna

AU - Hämäläinen, Sampo J.

AU - López González, Diego

AU - Van Dijken, Sebastiaan

AU - Stengel, Massimiliano

AU - Herranz, Gervasi

N1 - | openaire: EC/FP7/307502/EU//E-CONTROL

PY - 2018/5/25

Y1 - 2018/5/25

N2 - Strontium titanate (SrTiO3) is the quintessential material for oxide electronics. One of its hallmark features is the transition, driven by antiferrodistortive (AFD) lattice modes, from a cubic to a ferroelastic low-temperature phase. Here we investigate the evolution of the ferroelastic twin walls upon application of an electric field. Remarkably, we find that the dielectric anisotropy of tetragonal SrTiO3, rather than the intrinsic domain wall polarity, is the main driving force for the motion of the twins. Based on a combined first-principles and Landau-theory analysis, we show that such anisotropy is dominated by a trilinear coupling between the polarization, the AFD lattice tilts, and a previously overlooked antiferroelectric (AFE) mode. We identify the latter AFE phonon with the so-called "R mode" at ∼440 cm-1, which was previously detected in IR experiments, but whose microscopic nature was unknown.

AB - Strontium titanate (SrTiO3) is the quintessential material for oxide electronics. One of its hallmark features is the transition, driven by antiferrodistortive (AFD) lattice modes, from a cubic to a ferroelastic low-temperature phase. Here we investigate the evolution of the ferroelastic twin walls upon application of an electric field. Remarkably, we find that the dielectric anisotropy of tetragonal SrTiO3, rather than the intrinsic domain wall polarity, is the main driving force for the motion of the twins. Based on a combined first-principles and Landau-theory analysis, we show that such anisotropy is dominated by a trilinear coupling between the polarization, the AFD lattice tilts, and a previously overlooked antiferroelectric (AFE) mode. We identify the latter AFE phonon with the so-called "R mode" at ∼440 cm-1, which was previously detected in IR experiments, but whose microscopic nature was unknown.

UR - http://www.scopus.com/inward/record.url?scp=85047743782&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.120.217601

DO - 10.1103/PhysRevLett.120.217601

M3 - Article

VL - 120

SP - 1

EP - 6

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 21

M1 - 217601

ER -

ID: 25722044