Article
Nanoscience & Nanotechnology
Yukiko Obata, Michiko Sato, Yuji Kondo, Yuta Yamaguchi, Igor A. Karateev, Ivan Pavlov, Alexander L. Vasiliev, Silvia Haindl
Summary: This study addresses the peculiarities in pulsed laser deposition and the problem of chemical heterogeneity at the FeSe/MgO interface, proposing a solution to improve superconductivity by homogenizing the film/substrate interface with an Fe buffer. The research also shows that control of film texture is still possible under chemically homogenized FeSe/Fe interface.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Analytical
Yukiko Obata, Igor A. Karateev, Ivan Pavlov, Alexander L. Vasiliev, Silvia Haindl
Summary: The study explores the challenges in pulsed laser deposition of superconducting FeSe thin films, highlighting the importance of interface control, stoichiometry, and surface protection for potential sensor applications. Sophisticated engineering protocols are needed to overcome these limitations and enhance the application potential of FeSe thin films in sensor devices, particularly for thicknesses below 30 nm.
Article
Physics, Applied
T. Kobayashi, H. Ogawa, F. Nabeshima, A. Maeda
Summary: In this study, FeSe/STO films with a thickness of 5-30 nm were fabricated using pulsed laser deposition (PLD) technique. The grown films exhibit superconductivity with a higher onset Tc compared to bulk FeSe. The observed Tc values increase as the film thickness decreases, except for films thinner than 10 nm. These results indicate the realization of interface superconductivity in PLD-grown FeSe/STO.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Caiyun Hong, Zhen Song, Bing Lin, Pengxu Ran, Xiaopeng Xie, Congying Jiang, Rui-Hua He
Summary: We report on the dramatic effect of substrate surface reconstruction on thin film growth. Different surface reconstructions lead to the growth of thin films with distinct structures. Based on in-situ measurements of the electronic structure, two different phases of thin films were identified, which grow on substrates with different surface reconstructions.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2024)
Article
Physics, Applied
L. Grunewald, M. Langer, S. Meyer, D. Nerz, J. Haenisch, B. Holzapfel, D. Gerthsen
Summary: Thin films of Co-doped BaFe2As2 with similar thickness were grown on CaF2(001) substrates at different growth rates by pulsed laser deposition. Analytical TEM analysis revealed the presence of BaF2 and planar defects in the sample grown at a low rate, while high-quality epitaxial films with few antiphase boundaries were observed in the high growth rate sample, resulting in different Tc values and Fe precipitates. The role of O in defect formation and electron-beam-induced irradiation damage during TEM measurements were also discussed.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2021)
Article
Crystallography
Chenxiao Ye, Jiantao Che, Hai Huang
Summary: Based on the two-band Bogoliubov-de Gennes theory, we investigated the boundary effect of the interface between the two-gap superconductor FeSe and insulator (or vacuum). We introduced new boundary terms into the two-band Ginzburg-Landau formalism, which modified the boundary conditions for the corresponding order parameters of the superconductor. Our theory allowed for a mean-field calculation of the suppression of the critical temperature as the FeSe film thickness decreases. Our numerical results were in good agreement with the experimental data observed in this material.
Article
Chemistry, Physical
Norihiro Suzuki, Yuta Fujii, Naoya Ishida, Takeshi Kondo, Makoto Yuasa, Chiaki Terashima, Akira Fujishima
Summary: Porosity was introduced into a EuTiO3 thin film to create a crack-free film with nanopores. The film had a crystallized framework core and an amorphous shell, forming a core-shell structure. The amorphous shell contributed to the ferromagnetism through improved crystal field splitting and enhanced interaction between neighboring Eu2+ ions.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Pavel D. D. Grigoriev, Vladislav D. D. Kochev, Andrey P. P. Orlov, Aleksei V. V. Frolov, Alexander A. A. Sinchenko
Summary: Heterogeneous superconductivity onset is a common phenomenon in high-Tc superconductors, and in this study, it is analyzed in FeSe samples of various thicknesses. The measurements of interlayer and intralayer resistivity provide valuable information about the superconducting domain structure. It is observed that as the sample thickness decreases, there is an increase in superconducting transition temperature Tc. Analytical and numerical calculations are used to analyze and understand the aspect ratio and size of the SC domains in FeSe.
Article
Engineering, Electrical & Electronic
Botao Shao, Shengnan Zhang, Jixing Liu, Jianqing Feng, Chengshan Li, Pingxiang Zhang
Summary: Fluorine-doped Fe1.2Se polycrystalline samples were prepared via solid-state sintering method, with the findings indicating that fluorine doping effectively improved the superconducting properties and structural characteristics of the material. Moreover, increasing sintering temperature led to a reduction in the content of non-superconducting phases and grain size of superconducting phase.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Physical
Xia-Li Liang, Jian-Qing Dai
Summary: BFMO thin films were successfully deposited on FTO/glass substrates via sol-gel technique, with Mn doping showing significant enhancement in properties compared to pure BFO samples. The Mn doping-induced changes in structure, grain size reduction, and oxygen vacancies were identified as underlying mechanisms for the improved performance of BFMO films, making them promising for ferroelectric photovoltaic device applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Physics, Applied
Takumu Iwanaka, Toshiaki Kusunoki, Hiroshi Kotaki, Motomune Kodama, Hideki Tanaka, Akiyoshi Matsumoto, Shigeru Horii, Iwao Kawayama, Toshiya Doi
Summary: In order to understand the bending characteristics of MgB2 thin-film wire and its application in the design of superconducting magnets, the degradation of critical current density J(c) due to bending was investigated. Six MgB2 thin-film wires with a thickness of 1 μm were prepared under the same deposition conditions, and their J(c) were compared after being bent in different radii. The allowable bending radius at which J(c) does not degrade was found to be 25.0 mm. However, increasing the film thickness to 10 μm would raise the allowable bending radius to 25.5 mm. The small allowable bending radius of MgB2 thin-film wire does not hinder the fabrication of coils with the wire.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Kuwalai Panturotai, Chutiman Krataithong, Prayoonsak Pluengphon, Ekasiddh Wongrat, Auttasit Tubtimtae, Burapat Inceesungvorn
Summary: Undoped PbO thin films and Sb-doped PbO thin films with different concentrations were prepared, and the effects of Sb on the structural and optical properties were investigated. The results showed that Sb doping led to changes in the film structure and optical constants, which have important implications for optical devices in the UV to NIR range.
Article
Physics, Multidisciplinary
Mahmoud El-Araby, Moatasem Mostafa Khalefa, Ayan Mukherjee, M. A. Mohaseb, Ahmed A. Aboud
Summary: In this research, cobalt oxide thin films with pure and nickel doping were deposited using spray pyrolysis. Various characterization techniques, including XRD, EDX, XPS, SEM, and optical spectroscopy, were used to analyze the films. The results confirmed the successful doping of nickel and the formation of Co3O4 as the stable phase. The Ni-doped films showed decreased band gap values and exhibited excellent electrochemical properties for potential application in supercapacitor devices.
Article
Metallurgy & Metallurgical Engineering
Emine Guneri, Johnson Henry, Fatma Gode, Nilgun Kalaycioglu Ozpozan
Summary: Pure ZnO and Mn-doped ZnO thin films were prepared by chemical bath deposition method with various Mn doping concentrations. The structural, morphological, and optical properties of the films were analyzed using different techniques. XRD analysis revealed hexagonal structured ZnO in all films, with a peak shift observed in Mn-doped films. The crystallite size increased with Mn doping. The surface morphology of Mn-doped films exhibited irregularly shaped agglomerated particles. The transmittance spectra showed higher transmittance in the visible region, which decreased with Mn doping, indicating increased optical absorption. The band gap of Mn-doped films decreased with Mn doping. Mn-doped films exhibited higher optical and electrical conductivity in the UV region.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2023)
Article
Chemistry, Physical
Qingchen Duan, Shaohua Liu, Baizhuo Li, Jiaojiao Meng, Wuzhang Yang, Yuping Sun, Shenggui Fu, Qiang Jing, Shugang Tan, Dan Yu, Yuxue Mei, Zhi Ren, Cao Wang, Guanghan Cao
Summary: In this paper, the effects of iso-valent substitution of P/Sb for As in ThFePnN systems to modulate the chemical pressure were investigated. It was found that superconductivity in the P-doped ThFeAs1-xPxN system disappears at x = 0.3, while in the Sb-doped ThFeAs1-ySbyN samples, superconductivity is gradually suppressed at y = 0.25. The physical properties of ThFePnN samples significantly differ from those of LaFePnO, regardless of P or Sb doping.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Multidisciplinary Sciences
Chung Ting Ke, Christian M. Moehle, Folkert K. de Vries, Candice Thomas, Sara Metti, Charles R. Guinn, Ray Kallaher, Mario Lodari, Giordano Scappucci, Tiantian Wang, Rosa E. Diaz, Geoffrey C. Gardner, Michael J. Manfra, Srijit Goswami
NATURE COMMUNICATIONS
(2019)
Article
Multidisciplinary Sciences
Keng-Yu Yeh, Tung-Sheng Lo, Phillip M. Wu, Kuei-Shu Chang-Liao, Ming-Jye Wang, Maw-Kuen Wu
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2020)
Article
Physics, Applied
Ivan Kulesh, Chung Ting Ke, Candice Thomas, Saurabh Karwal, Christian M. Moehle, Sara Metti, Ray Kallaher, Geoffrey C. Gardner, Michael J. Manfra, Srijit Goswami
PHYSICAL REVIEW APPLIED
(2020)
Article
Materials Science, Multidisciplinary
T. -W. Lan, K. -H. Su, C. -C. Chang, C. -L. Chen, M. -N. Ou, D. -Z. Wu, P. M. Wu, C. -Y. Su, M. -K. Wu, Y. -Y. Chen
MATERIALS TODAY PHYSICS
(2020)
Article
Materials Science, Multidisciplinary
K. H. Su, P. W. Chi, T. Paul, C. H. Chung, W. M. Chen, Y. S. Su, P. M. Wu, C. Y. Su, M. K. Wu
Summary: "The study shows that lithium ferrite undergoes a phase (morphology) transition and magnetic switching after charge-discharge reaction; DFRTs analysis confirms two types of Li ion migrations; 4 cycles are needed to achieve a capacity similar to 600 mAh/g at 0.1C rate."
MATERIALS TODAY PHYSICS
(2021)
Article
Multidisciplinary Sciences
T. Paul, P. W. Chi, Phillip M. Wu, M. K. Wu
Summary: In this paper, DRT functions are numerically calculated for different systems with impedance data, and the quality of impedance data is checked using Kramers-Kronig relations. The DRTs are calculated using Tikhonov regularization method and the physical significance of peaks are discussed through peak fitting program.
SCIENTIFIC REPORTS
(2021)
Article
Materials Science, Multidisciplinary
Chandra Shekar Gantepogu, Chia-Ming Yang, Peramaiyan Ganesan, In-Gann Chen, Ming-Jye Wang, Judith MacManus-Driscoll, Seung-Hyun Moon, Connie Wang, Maw-Kuen Wu
Summary: The GdBa2Cu3O7-x (Gd123) films with self-assembled BaZrO3 (BZO) nanostructure on ion-beam-assisted deposited MgO substrate showed enhanced critical current density JC and flux pinning force (Fp) under high magnetic fields. The addition of a 3D BZO nanostructure network improved the performance of the superconductor coated conductor and could be further optimized for better results.
MATERIALS TODAY PHYSICS
(2021)
Article
Chemistry, Physical
Nahid Kaisar, Tanmoy Paul, Po-Wei Chi, Yu-Hsun Su, Anupriya Singh, Chih-Wei Chu, Maw-Kuen Wu, Phillip M. Wu
Summary: A facile solution process was used to prepare CsPbI3 as an anode material for Li-ion batteries. The material showed promising performance and structural integrity during electrochemical testing, indicating its potential for future LIB applications.
Article
Materials Science, Multidisciplinary
Fan-Yun Chiu, Tsu-Lien Hung, Cheng-Yen Liu, Ya-Hsin Pai, Wei-Liang Chien, Peng-Jen Chen, Ting-Kuo Lee, Ming-Jye Wang, Min-Nan Ou, Chang C. Tsuei, Maw-Kuen Wu, Chia-Seng Chang, Yang-Yuan Chen
Summary: Studying the properties of high quality single crystals is important for resolving the issue of certain debatable fundamental properties in interesting materials. However, large single crystals for experimental measurements are not always available. NbN is an example that has attracted scientific and engineering interest due to its diverse physical properties and various structural phases. Superconductivity has only been observed in cubic delta- and tetragonal gamma-NbN, but not in hexagonal epsilon-NbN. Recent research used electron backscattering diffraction technique to characterize the phases of micron-sized NbN crystals from commercial powders and measure their transport properties, confirming that the hexagonal epsilon-NbN phase is not superconducting.
Article
Physics, Multidisciplinary
Gu Zhang, Chung-Hou Chung, Chung-Ting Ke, Chao-Yun Lin, Henok Mebrahtu, Alex Smirnov, Gleb Finkelstein, Harold U. Baranger
Summary: This study investigates the nonequilibrium properties of correlated quantum matter, focusing on the behavior near a quantum critical point. By analyzing the steady-state current in a critical system and comparing it with experimental results, the quantitative agreement between theory and experiment is demonstrated. Fine tuning of a quantum dot using electrostatic gates allows for the calculation and measurement of nonlinear current at critical values, providing an ideal setting for studying nonequilibrium phenomena in correlated quantum matter.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Physics, Multidisciplinary
Keng-Yu Yeh, Yan-Ruei Chen, Tung-Sheng Lo, Phillip M. Wu, Ming-Jye Wang, Kuei-Shu Chang-Liao, Maw-Kuen Wu
FRONTIERS IN PHYSICS
(2020)
Article
Physics, Multidisciplinary
C. T. Ke, A. W. Draelos, A. Seredinski, M. T. Wei, H. Li, M. Hernandez-Rivera, K. Watanabe, T. Taniguchi, M. Yamamoto, S. Tarucha, Y. Bomze, I. Borzenets, F. Amet, G. Finkelstein
PHYSICAL REVIEW RESEARCH
(2019)
Article
Materials Science, Multidisciplinary
M. T. Wei, A. W. Draelos, A. Seredinski, C. T. Ke, H. Li, Y. Mehta, K. Watanabe, T. Taniguchi, M. Yamamoto, S. Tarucha, G. Finkelstein, F. Amet, I. Borzenets
Article
Materials Science, Multidisciplinary
A. W. Draelos, A. Silverman, B. Eniwaye, E. G. Arnault, C. T. Ke, M. T. Wei, I Vlassiouk, I. Borzenets, F. Amet, G. Finkelstein
