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Determination of the Local Symmetry and the Multiferroic-ferromagnetic Crossover in Ni3-xCoxV2O8 by using Raman Scattering Spectroscopy
Yu-Seong Seo, Sun-Hwa Kim, Jai Seok Ahn +1
Comprehensive vibrational studies on the multiferroic-to-normal-ferromagnetic crossover in isostructural Ni3-xCoxV2O8 (NCVO, x = 0 - 3.0) are performed using Raman scattering spect…
Soft Modes and Local Structural Transitions in Pb-free Ba(Ti0.8Zr0.2)O3-x(Ba0.7Ca0.3)TiO3 (x = 0.5): Pressure- and Temperature-dependent Raman Studies
Yu-Seong Seo, Jai Seok Ahn, Il-Kyoung Jeong
We report our Raman studies of a new lead-free relaxor ferroelectrics, Ba0.85Ca0.15Ti0.9Zr0.1O3 (BCTZO). The Raman modes of BCTZO are compared with those of BaTi0.8Zr0.2O3 (BTZO),…
First-principles Investigations on Polytypes of BaTiO3: Hybrid Calculations and Pressure Dependences
Yu-Seong Seo, Jai Seok Ahn
We report our first-principles investigations on three polytypes of BaTiO3 (BTO): a paraelectric phase with cubic Pm-3m structure and two ferroelectric (FE) phases with tetragonal…
Ab-initio studies on the phonons of BaTiO3 polytypes: pressure dependences with a hybrid functional
Yu-Seong Seo, Jai Seok Ahn
We report the first principles investigations on the phonons of three polytypes of BaTiO3 (BTO): paraelectric (PE) cubic Pm-3m and two ferroelectric (FE) phases, tetragonal P4mm an…