J
J. S. Ahn
Researcher at Pusan National University
Publications - 42
Citations - 3075
J. S. Ahn is an academic researcher from Pusan National University. The author has contributed to research in topics: Phonon & Tetragonal crystal system. The author has an hindex of 18, co-authored 41 publications receiving 2877 citations. Previous affiliations of J. S. Ahn include Seoul National University & Rutgers University.
Papers
More filters
Journal ArticleDOI
Electric polarization reversal and memory in a multiferroic material induced by magnetic fields.
TL;DR: A striking interplay between ferroelectricity and magnetism in the multiferroic TbMn2O5 is reported, demonstrated by a highly reproducible electric polarization reversal and permanent polarization imprint that are both actuated by an applied magnetic field.
Journal ArticleDOI
Mid-infrared properties of a VO 2 film near the metal-insulator transition
TL;DR: The MI transition of the VO film was modeled with coexistence of metallic and insulating domains and their dynamic evolution and the mean free path of charge carriers in the dc limit was estimated to be larger by an order of magnitude than the previously reported value.
Journal ArticleDOI
Thermal conductivity of geometrically frustrated, ferroelectric YMnO3: extraordinary spin-phonon interactions.
Peter Anand Sharma,J. S. Ahn,J. S. Ahn,Namjung Hur,S. Park,Sung Baek Kim,Seongsu Lee,Seongsu Lee,J.-G. Park,J.-G. Park,S. Guha,S. W. Cheong +11 more
TL;DR: The thermal conductivity of the magnetically frustrated, ferroelectric YMnO3 exhibits an isotropic suppression in the cooperative paramagnetic state, followed by a sudden increase upon magnetic ordering, suggestive of the strong influence of multiferroicity.
Journal ArticleDOI
Exchange interaction effects on the optical properties of LuMnO3.
A. B. Souchkov,Jeffrey R. Simpson,M. Quijada,Hiroki Ishibashi,Namjung Hur,J. S. Ahn,J. S. Ahn,Sang-Wook Cheong,Andrew J. Millis,H. D. Drew +9 more
TL;DR: In this article, the optical conductivity of LuMnO3 was measured at temperatures between 4 and 300 K, and it was shown that a symmetry allowed on-site Mn d-d transition near 1.7 eV is observed to blueshift (approximately 0.1 eV) in the antiferromagnetic state due to Mn-Mn superexchange interactions.
Journal ArticleDOI
Ferroelectricity driven by Y d0-ness with rehybridization in YMnO3.
Deok-Yong Cho,J.-Y. Kim,Byeong-Gyu Park,K.-J. Rho,Jae-Hoon Park,H. J. Noh,Beom Jun Kim,Se-Jung Oh,H. M. Park,J. S. Ahn,Hiroki Ishibashi,Sang-Wook Cheong,J. H. Lee,Pattukkannu Murugavel,Tae-Hee Noh,Arata Tanaka,Takeo Jo +16 more
TL;DR: In this article, the authors investigated the electronic structure of hexagonal multiferroic YMnO3 using the polarization dependent x-ray absorption spectroscopy (XAS) at O K and Mn L(2,3) edges.