M. G. Stachiotti

Institute of Physics Rosario

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

M. Sepliarsky

National University of Rosario

R. L. Migoni

National University of Rosario

Carlos O. Rodriguez

University of California, Davis

R. Machado

Institute of Physics Rosario

Silvia Tinte

Instituto de Física del Litoral

Simon R. Phillpot

University of Florida

N. Pellegri

National University of Rosario

O. de Sanctis

National University of Rosario

A. Frattini

National University of Rosario

R. Migoni

Institute of Physics Rosario

Cooperative Institutions

Consejo Nacional de Investigaciones Científicas y Técnicas

Institute of Physics Rosario

National University of Rosario

Universidad Nacional de La Plata

Max Planck Institute for Solid State Research

Comisión Nacional de Energía Atómica

Aarhus University

Max Planck Society

Centro Científico Tecnológico - San Juan

Argonne National Laboratory

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Lattice dynamics of the high-Tc superconductor HgBa2CuO4

Physica C Superconductivity (1995)

M. G. Stachiotti E. L. Peltzer y Blancá R. L. Migoni Carlos O. Rodriguez N. E. Christensen

Dispersion relation

Lattice (music)

10.1016/0921-4534(94)00009-3

Cite

Citations (16)

Particle dynamics in the vicinity of a ferroelectric phase transition

Ferroelectrics (1994)

M. G. Stachiotti A. Dobry R. Migoni A. Bussmann‐Holder

Abstract The dynamics of ions in the neighborhood of a ferroelectric phase transition is studied by means of a molecular dynamics simulation in the framework of the non-linear polarizability model. In the high temperature phase, the instantaneous displacement patterns show clusters of particles with coherent polarization. Consenquently, a low frequency peak in the dynamic response appears due to the slow dynamics of these precursor regions. The local particle dynamics is characterized by the coexistence of oscillatory and relaxational motions on different time scales.

Dynamics

Particle (ecology)

10.1080/00150199408016566

Cite

Citations (0)

Temperature-driven phase transitions in SrBi2Ta2O9 from first-principles calculations

Applied Physics Letters (2008)

R. Machado M. Sepliarsky M. G. Stachiotti

The phase transition sequence of SrBi2Ta2O9 is investigated using a shell model with parameters fitted to first-principles calculations. We show that the complex interplay between polar and nonpolar instabilities leads to the presence of two phase transitions, corroborating the existence of an intermediate orthorhombic paraelectric phase. This phase is characterized by the rotation of the TaO6 octahedra around the a axis. We show that this phase can also be detected from the dielectric response of the material. The present approach constitutes a powerful tool for a theoretical prediction of intermediate phases, not yet observed experimentally, in other Aurivillius compounds.

Aurivillius

Orthorhombic crystal system

10.1063/1.3049612

Cite

Citations (11)

Atomic-level simulation of ferroelectricity in perovskite solid solutions

Applied Physics Letters (2000)

M. Sepliarsky Simon R. Phillpot D. Wolf M. G. Stachiotti R. L. Migoni

Building on the insights gained from electronic-structure calculations and from experience obtained with an earlier atomic-level method, we developed an atomic-level simulation approach based on the traditional Buckingham potential with shell model which correctly reproduces the ferroelectric phase behavior and dielectric and piezoelectric properties of KNbO3. This approach now enables the simulation of solid solutions and defected systems; we illustrate this capability by elucidating the ferroelectric properties of a KTa0.5Nb0.5O3 random solid solution.

Buckingham

10.1063/1.126843

Cite

Citations (52)

Magnetic and electrical properties of single-phase multiferroic (1-x)Pb(Zr0.52Ti0.48)O3–xPb(Fe0.5Nb0.5)O3 thin films prepared by sol-gel route

Journal of the European Ceramic Society (2021)

L. Imhoff A. Román S. Barolin N. Pellegri Laura Steren

Atmospheric temperature range

Hysteresis

10.1016/j.jeurceramsoc.2021.11.056

Cite

Citations (3)

Quantum Mechanical Modelling of Pure and Defective KNbO3 Perovskites

Springer eBooks (2000)

N. E. Christensen E. A. Kotomin R. I. Eglitis A. V. Postnikov G. Börstel

Formalism (music)

10.1007/978-94-011-4030-0_1

Cite

Citations (1)

Ferroelectric phase transitions and dynamical behavior in KNbO3/KTaO3 superlattices by molecular-dynamics simulation

Journal of Applied Physics (2002)

M. Sepliarsky Simon R. Phillpot M. G. Stachiotti R. L. Migoni

The phase transitions and dynamical behavior of superlattices consisting of equal-thickness layers of a perovskite ferroelectric (KNbO3) and a perovskite paraelectric (KTaO3) are explored using molecular-dynamics simulation. We find that the response in the plane and in the modulation direction are essentially decoupled. The Curie temperature for the transition from a polarized to unpolarized state in the modulation direction decreases approximately linearly with modulation length, Λ, for Λ>12; for smaller modulation lengths, it is essentially constant. The Curie temperature in the plane appears to be only weakly modulation-length dependent. We relate our results to experimental findings on the same system.

Modulation (music)

10.1063/1.1435826

Cite

Citations (51)

ChemInform Abstract: Transition Metal Oxide Chemistry: Electronic Structure Study of WO₃, ReO₃, and NaWO₃.

ChemInform (1997)

Furio Corà M. G. Stachiotti C. Richard A. Catlow Carlos O. Rodriguez

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

10.1002/chin.199731003

Cite

Citations (1)

Ferroelectric soft mode and relaxation behavior in a molecular-dynamics simulation ofKNbO3andKTaO3

Physical review. B, Condensed matter (1997)

M. Sepliarsky M. G. Stachiotti R. L. Migoni

A molecular-dynamics simulation is performed for ${\mathrm{KTaO}}_{3}$ and the paraelectric phase of ${\mathrm{KNbO}}_{3}$ in the framework of the nonlinear oxygen polarizability model. The dynamical structure factor for wave vector $\mathbf{q}=0$ is studied as a function of temperature. In ${\mathrm{KNbO}}_{3}$ a peak corresponding to the ferroelectric mode can hardly be identified only near the melting point. It coexists with a well developed central peak which grows in intensity and narrows with decreasing temperature. The latter is correlated with the observation of a relaxation dynamics between off-center minima of the effective potential for the soft-mode coordinate. The soft-mode peak shifts to higher frequencies and gains intensity as the temperature is further increased above the melting point, while the central peak disappears. This behavior constitutes theoretical evidence of a crossover from a displacive to an order-disorder dynamical regime near the ferroelectric phase transition in ${\mathrm{KNbO}}_{3}.$ This crossover was originally postulated to interpret the experimental data. Although these are available in the lower temperature range where the soft mode is not observed as a separate excitation, a coexistence of both dynamics had to be proposed to interpret the various experiments. In ${\mathrm{KTaO}}_{3}$ we observe a well-defined ferroelectric-mode peak which softens with temperature in good agreement with experimental data.

Soft modes

10.1103/physrevb.56.566

Cite

Citations (23)

Guest Editorial

Ferroelectrics (2006)

R. L. Migoni M. G. Stachiotti

10.1080/00150190600752189

Cite

Citations (0)