http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Electronic structure of detwinned BaFe2As2from photoemission and first principles
Kim, Yeongkwan,Oh, Hyungju,Kim, Chul,Song, Dongjoon,Jung, Wonsig,Kim, Beomyoung,Choi, Hyoung Joon,Kim, Changyoung,Lee, Bumsung,Khim, Seunghyun,Kim, Hyungjoon,Kim, Keehoon,Hong, Jongbeom,Kwon, Yongseun American Physical Society 2011 Physical review. B, Condensed matter and materials Vol.83 No.6
Jinkwon Kim,Junsik Mun,Youngdo Kim,Bongju Kim,Jeong Rae Kim,Lingfei Wang,Miyoung Kim,Changyoung Kim,Jason W. A. Robinson,Yoshiteru Maeno,Tae Won Noh 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.2
Ruddlesden-Popper (RP) phase oxides (An+1BnO3n+1, n = 1, 2, ...) have been spotlighted with versatile physical properties such as high-temperature superconductivity, colossal magnetoresistance. These emergent phenomena provide a platform for novel oxide-based electronic devices including spintronics application. However, high-quality RP-phase thin film growth has been disturbed by extended structural defects, such as out-of-phase boundaries (OPBs). OPB is a translational boundary between neighboring unit cells, shifted in a specific crystallographic direction. For instance, if RP-phase thin films grown on ABO₃ perovskite substrates, the structural mismatch between film and substrates induces a crystallographic shift in the c-axis direction, thus OPBs form at the film-substrate interface. Since OPB formation hampers the physical properties of RP-phase thin films, the suppression of the structural defects is highly required to carry out the high-performance RP-phase based functional devices. In this study, we suppressed OPB suppression in RP-phase oxide thin films by atomic-scale interface engineering. As model systems, the unconventional superconductor Sr₂RuO₄ (bulk Tc ~ 1.5 K) and La2-xSrxCuO₄ (bulk Tc ~ 39 K) thin films were employed. Despite the structural similarities between films and substrates, Sr2RuO4 and La2-xSrxCuO₄ films exhibited huge OPB formations. By controlling the atomic-scale interface engineering, the OPBs were significantly suppressed in the film structure. Notably, these OPB-free Sr₂RuO₄ and La2-xSrxCuO₄ thin films exhibited highly enhanced superconductivity than the film with huge OPB formation. Our study suggests a comprehensive method to suppress OPB formation in RP thin films, enabling superconducting spintronics devices based on the unconventional superconductivity.
Interlayer-state-driven superconductivity inCaC6studied by angle-resolved photoemission spectroscopy
Kyung, Wonshik,Kim, Yeongkwan,Han, Garam,Leem, Choonshik,Kim, Chul,Koh, Yoonyoung,Kim, Beomyoung,Kim, Youngwook,Kim, Jun Sung,Kim, Keun Su,Rotenberg, Eli,Denlinger, Jonathan D.,Kim, Changyoung American Physical Society 2015 Physical review. B, Condensed matter and materials Vol.92 No.22
Spin and orbital angular momentum structure of Cu(111) and Au(111) surface states
Kim, Beomyoung,Kim, Choong H.,Kim, Panjin,Jung, Wonsig,Kim, Yeongkwan,Koh, Yoonyoung,Arita, Masashi,Shimada, Kenya,Namatame, Hirofumi,Taniguchi, Masaki,Yu, Jaejun,Kim, Changyoung American Physical Society 2012 Physical review. B, Condensed matter and materials Vol.85 No.19
Jinkwon Kim,Youngdo Kim,Junsik Mun,Jeong Rae Kim,Miyoung Kim,Changyoung Kim,Tae Won Noh 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.1
Over the past decades, Ruddlesden-Popper (RP) phase oxides (A<sub>n+1</sub>B<sub>n</sub>O<sub>3n+1</sub>, n = 1, 2, ...) have been spotlighted with advantageous physical properties such as high-temperature superconductivity, giant magnetoresistance. <sup>[1-2]</sup> These emergent phenomena provide a platform for novel oxide-based electronic devices including spintronics application. However, high-quality RP-phase thin film growth has been disturbed by extended structural defects, so-called out-of-phase boundaries (OPBs).<sup>[3]</sup> OPB is a translational boundary between neighboring unit cells, shifted in a specific crystallographic direction. For instance, if RP-phase thin films grown on ABO<sub>3</sub> perovskite substrates, the structural mismatch between film and substrates induces a crystallographic shift in the c-axis direction, thus OPBs form at the film-substrate interface. Since OPB formation hampers the physical properties of RP-phase thin films, the suppression of the structural defects is highly required to carry out the high-performance RP-phase based functional devices.<sup>[4-5]</sup> In this study, we suppressed OPB suppression in RP-phase oxide thin films by using single-terminated LaSrAlO4 substrate (n = 1 RP phase, a = b= 3.756 Å and c =12.636 Å). As a model system, the high-T<sub>c</sub> cup rates superconductor La<sub>1.85</sub>Sr<sub>0.15</sub>CuO4 thin film (n = 1 RP phase, a = b= 3.777 Å and c =13.226 Å) was employed. Despite the structural similarities between films and substrates, the La<sub>2-x</sub>Sr<sub>x</sub>CuO<sub>4</sub> films exhibited huge OPB formations when deposited on mixed-terminated LaSrAlO4 substrate. In contrast, when the La<sub>2-x</sub>Sr<sub>x</sub>CuO<sub>4</sub> films were deposited on single-terminated LaSrAlO4 substrates, the OPBs were significantly suppressed in the film structure. Notably, these OPB-free La<sub>2-x</sub>Sr<sub>x</sub>CuO<sub>4</sub> films exhibited highly enhanced superconductivity (T<sub>c</sub><sup>zero</sup> ~ 30 K) than the film with huge OPB formation (T<sub>c</sub><sup>zero</sup> ~ 5 K) under the same thickness (~ 6.5 nm). Our study suggests a comprehensive method to suppress OPB formation in RP thin films, enabling superconducting spintronics devices based on RP-phase high-T<sub>c</sub> superconductors.[5-6]
Warping effects in the band and angular-momentum structures of the topological insulator Bi2Te3
Jung, Wonsig,Kim, Yeongkwan,Kim, Beomyoung,Koh, Yoonyoung,Kim, Chul,Matsunami, Masaharu,Kimura, Shin-ichi,Arita, Masashi,Shimada, Kenya,Han, Jung Hoon,Kim, Juyoung,Cho, Beongki,Kim, Changyoung American Physical Society 2011 Physical review. B, Condensed matter and materials Vol.84 No.24