36 citations · 95 across the 6 of their papers we have counts for
6 papers
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…
Finite difference method for the arbitrary potential in two dimensions: application to double/triple quantum dots
Jai Seok Ahn
A finite difference method (FDM) applicable to a two dimensional (2D) quantum dot was developed as a non-conventional approach to the theoretical understandings of quantum devices.…
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…
Carbon substitution effect in MgB
Jai Seok Ahn, Eun Jip Choi
We investigated carbon substitution effect on boron plane of superconducting MgB. MgB and MgBC samples are synthesized under high pressure furnace. MgB$_{1.…