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Japil Koo

Pohang University of Science and Technology

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Featured researches published by Japil Koo.

Journal of the Physical Society of Japan | 2010

Magnetic and Structural Phase Transitions of EuFe2As2 Studied via Neutron and Resonant X-ray Scattering

Japil Koo; J.-H. Park; Sung Kook Cho; Ki Duk Kim; Sang-Youn Park; Yoon Hee Jeong; Y. J. Park; Tae Yeong Koo; Kun-Pyo Hong; Chang-Hee Lee; Ju-Young Kim; B. K. Cho; Ki Bong Lee; Heon-Jung Kim

Employing neutron and resonant x-ray scatterings, we have investigated the magnetic and structural phase transitions of a high quality single crystal of undoped pnictide EuFe 2 As 2 to reveal the nature of these transitions. It has been found that structural order parameter δ=( a - b )/( a + b ) and the square of Fe magnetic order parameter have the same temperature dependence, which is attributed to the linear-quadratic coupling between structural and Fe magnetic order parameters in the Landau free-energy expansion. This result also suggests that Fe magnetic order drives the structural phase transition which is the weak first-order phase transition.

Macromolecules | 2003

Switchable Tack in Side-Chain Liquid Crystalline Polymers†

Kilwon Cho; Jeong Ho Cho; Soong Yoon; Chan Eon Park; Jong-Chan Lee; Se-Hui Han; Ki Bong Lee; Japil Koo

Physical Review Letters | 2013

Oxygen-Vacancy-Induced Orbital Reconstruction of Ti Ions at the Interface of LaAlO3/SrTiO3 Heterostructures: A Resonant Soft-X-Ray Scattering Study

Jihye Park; Byeong-Gwan Cho; Kyungjun Kim; Japil Koo; Hyun M. Jang; K.-T. Ko; Jae Hoon Park; Ki Bong Lee; J.-Y. Kim; Dong-hyun Lee; C. A. Burns; Sung Seok A. Seo; Ho Nyung Lee

Physical Review B | 2006

Resonant x-ray scattering study on multiferroicBiMnO3

Chan-Ho Yang; Japil Koo; Changyong Song; T. Y. Koo; K.-B. Lee; Y. H. Jeong

Langmuir | 2003

Structure and Chain Orientation in Thin Films of Side-Chain Liquid Crystalline Polymers

Kilwon Cho; Jeong Ho Cho; Jong-Chan Lee; Se-Hui Han; Ki Bong Lee; Japil Koo

Physical Review B | 2006

Resonant x-ray scattering study on multiferroic BiMnO{sub 3}

Chan-Ho Yang; Japil Koo; Changyong Song; T. Y. Koo; K.-B. Lee; Y. H. Jeong

Physical Review Letters | 2003

Interference of magnetic and anisotropic tensor susceptibility reflections in resonant X-ray scattering of GdB4

Sungdae Ji; Changyong Song; Japil Koo; Kitae Lee; Y. J. Park; J.-Y. Kim; J.-H. Park; Hyun-Joon Shin; Rhyee Js; Oh Bh; B. K. Cho

Polymer | 2003

Quantitative analysis on the adsorbed amount and structural characteristics of spin self-assembled multilayer films

Jinhan Cho; Seung Heon Lee; Huiman Kang; Kookheon Char; Japil Koo; Byoung Hoon Seung; Ki Bong Lee

Physical Review Letters | 2007

Resonant X-ray scattering study of quadrupole-strain coupling in DyB4.

Sungdae Ji; Changyong Song; Japil Koo; Jung Mee Park; Y. J. Park; Kitae Lee; S. Lee; Je-Geun Park; J.-Y. Kim; B. K. Cho; Kun-Pyo Hong; Changhee Lee; Fumitoshi Iga

Physical Review B | 2003