Article
Physics, Applied
Chen-Xiao Ye, Jian-Tao Che, Hai Huang
Summary: The study of the electromagnetic properties of Co-doped BaFe2As2 thin film suggests it may be a two-gap s-wave superconductor, and proposes a trijunction experiment to probe the pairing symmetry in the material.
MODERN PHYSICS LETTERS B
(2021)
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
Engineering, Electrical & Electronic
Zeyu Wu, Kohei Higashikawa, Kazutaka Imamura, Zhongtang Xu, Yanwei Ma, Takanobu Kiss
Summary: The spatial distribution of local critical current density (J(c)) in a Co-doped BaFe2As2 (Ba122:Co) film was investigated using scanning Hall-probe microscopy (SHPM). Through high-resolution characterization, local obstacles and a spot with extremely high J(c) were detected, with validation from a magnetization measurement. Additionally, J(c) distributions at different temperatures were studied, with results showing that intrinsic in-plane pinning is controlled by the same mechanism.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2021)
Article
Biochemistry & Molecular Biology
Wangying Xu, Tao Peng, Shuangmu Zhuo, Qiubao Lin, Weicheng Huang, Yujia Li, Fang Xu, Chun Zhao, Deliang Zhu
Summary: Solution-grown phosphorus-doped indium oxide thin-film transistors (IPO TFTs) demonstrate promising characteristics such as high mobility and transparency, while effectively inhibiting oxygen-vacancy-related defects.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Engineering, Electrical & Electronic
Hadi Ebrahimi-Darkhaneh, Mahsa Shekarnoush, Josefina Arellano-Jimenez, Rodolfo Rodriguez, Luigi Colombo, Manuel Quevedo-Lopez, Sanjay K. Banerjee
Summary: Epitaxial growth and characterization of Mg-doped Ga2O3 thin films on sapphire substrates using pulsed laser deposition were investigated. The films exhibited p-type semiconducting behavior and an increased band gap compared to pure Ga2O3, making them suitable for applications in ultraviolet photodetectors and power electronic devices.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Crystallography
Jianlu Geng, Dongxu Li, Hua Hao, Qinghu Guo, Huihuang Xu, Minghe Cao, Zhonghua Yao, Hanxing Liu
Summary: A modulating crystalline/amorphous phase structure strategy is proposed to enhance the energy storage performance of BaTiO3 films by Mn-doping and annealing temperature control.
Article
Nanoscience & Nanotechnology
Fan Ma, Dongwei Ao, Bing Sun, Wei-Di Liu, Bushra Jabar, Xiangdong Liu
Summary: The thermoelectric performance of Sb2Te3 thin films can be improved by direct current treatment, achieving high electrical conductivity and moderate Seebeck coefficient.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Ceramics
Sourav Mondal, Durga Basak
Summary: This study investigates the effect of donor-acceptor compensation in phosphorus-doped zinc oxide thin films grown under different gas atmospheres using photoconductivity and photoluminescence techniques. The results demonstrate that an oxygen-rich environment accelerates the formation of acceptor defects, thereby enhancing the ultraviolet photosensitivity.
CERAMICS INTERNATIONAL
(2022)
Article
Nanoscience & Nanotechnology
Haixu Liu, Hui Li, Junlei Tao, Jia Liu, Jinzheng Yang, Junjie Li, Jianmin Song, Jie Ren, Min Wang, Shaopeng Yang, Xin Song, Yanfeng Wang
Summary: This study developed a preparation scheme for AlF3 and GaF3 co-doped ZnO thin films using magnetron sputtering. The theoretical calculations and experimental results showed that the prepared FAGZO films had high electron mobility, low resistivity, and wide spectrum transmission performance. Moreover, the application of FAGZO films in perovskite solar cells demonstrated improved photocurrent density and power conversion efficiency compared to the reference film.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Siavash Bakhtiarnia, Saeed Sheibani, Abbas Nadi, Eric Aubry, Hui Sun, Pascal Briois, Mohammad Arab Pour Yazdi
Summary: Cu-doped BiVO4 nanoporous thin films were synthesized using reactive magnetron sputtering, and the study found that the Cu content had a significant impact on the structure and photocatalytic activity of the films. The film with 2 at.% Cu exhibited the best photocatalytic performance.
APPLIED SURFACE SCIENCE
(2023)
Article
Engineering, Electrical & Electronic
Min Shi, Zhuolin Si, Enyang Men, Zheng Zhao, Yudong Xu, Ruzhong Zuo, Li Guo, Kunzhuang Hu
Summary: This study investigated the deposition of (Bi0.5Na0.5)(Ti1-xMnx)O3-delta (BNTMx) films on substrates through the sol-gel method, exploring the influence of Mn doping on microstructures and ferroelectric properties. Analysis of the valence states of Mn ions revealed their presence as Mn2+, Mn3+, and Mn4+. An optimum ferroelectric performance was observed in films with a Mn doping content of 0.04, highlighting their potential for future applications in multi-functional devices.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Multidisciplinary
A. Raval, I. A. Shaikh, Y. N. Doshi, N. M. Shastri, L. K. Saini, D. Shah
Summary: A simple drop-casting technique was used to prepare tin selenide thin films with triethanolamine as complexing agent. The synthesized films were analyzed for their surface morphology, structure, electrical conductivity, and optical properties. The results showed that the films had an orthorhombic crystal structure, good continuity, and were suitable for use as an absorber layer in solar cells.
MATERIALS TODAY CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
Sai-Dong Xue, De-Long Zhang
Summary: Er3+/Yb3+ doped LiNbO3 (LN) single crystal films with varying Yb3+ doping level were successfully grown on z-cut LiTaO3 bulk single crystals using e-beam evaporation method. The films predominantly consist of oriented LN phase along (006). The elemental distribution is uniform throughout the films. The luminescence intensities in the visible and near-infrared region increase with increasing Yb3+ doping concentration, while the Li2O content remains constant. The concentrations of Er3+ and Yb3+ in the films are lower compared to polycrystalline powder due to the low efficiency of e-beam evaporation for heavy ions.
Article
Materials Science, Multidisciplinary
Dongyi Qin, Kazumasa Iida, Takafumi Hatano, Hikaru Saito, Yiming Ma, Chao Wang, Satoshi Hata, Michio Naito, Akiyasu Yamamoto
Summary: In this study, epitaxial Ba1-xKxFe2As2 thin films were successfully grown by molecular-beam epitaxy, enhancing the competitiveness of key materials for magnetic field applications. With the combination of fluoride substrates and a low growth temperature, epitaxial thin films grown on CaF2 exhibited excellent superconducting properties at 4K.
PHYSICAL REVIEW MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Dongwen Gao, Li Wang, Xueqiong Su, Jin Wang, Ruixiang Chen
Summary: This paper utilizes the pulsed laser deposition (PLD) method to prepare ZnS:Co thin films, studying their optical properties under different substrate and temperature conditions, and finding that high temperatures favor the formation of crystals.
Article
Physics, Applied
Dong Li, Peipei Shen, Jinpeng Tian, Ge He, Shunli Ni, Zhaosheng Wang, Chuanying Xi, Li Pi, Hua Zhang, Jie Yuan, Kui Jin, Evgeny F. Talantsev, Li Yu, Fang Zhou, Jens Haenisch, Xiaoli Dong, Zhongxian Zhao
Summary: The magneto-transport properties of a series of single-crystal films of intercalated iron-selenide superconductor (Li,Fe)OHFeSe were systematically measured under c-direction fields up to 33 T. A new vortex-phase diagram was established for the weakly-disordered high-T (c) (Li,Fe)OHFeSe, showing an emergent dissipative vortex phase intermediate between the common vortex glass and liquid phases.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
M. Y. Chen, K. Iida, K. Kondo, J. Haenisch, T. Hatano, H. Ikuta
Summary: Resistivity anisotropy of NdFeAs(O,H) thin films with different hydrogen concentrations was studied, showing higher γ(ρ) values at higher hydrogen concentrations and lower γ(ρ) value for the highest doped sample. The exponent β of the ab-plane resistivity fitting was close to unity, indicating the presence of a quantum critical point near the second antiferromagnetic phase.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Pablo Cayado, Devendra K. Namburi, Manuela Erbe, Jens Haenisch, David A. Cardwell, John H. Durrell, Bernhard Holzapfel
Summary: Transport measurements were conducted on a cross-sectional slice of a 25 mm diameter GdBa2Cu3O7-x-Ag single-grain superconductor, revealing its trapping capability of a maximum magnetic field of approximately 1 T at 77 K. The challenges in transport measurements of superconducting, bulk single-grain RE-Ba-Cu-O [(RE)BCO] samples, attributed to their high critical current densities and poor mechanical properties, were addressed by a straightforward and reliable approach to prepare reproducible specimens and subsequent transport property measurements using a commercial Physical Property Measurement System (PPMS). The critical current densities obtained from magnetic and transport measurements were compared and discussed.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Physics, Applied
J. Zhang, Jens Haenisch, X. S. Yang, K. Zhao, Y. Zhao
Summary: A series of carbon-doped single crystals with nominal composition FeSe0.5Te0.5 were synthesized. X-ray diffraction revealed that the lattice parameter c increased with increasing carbon content, indicating the incorporation of carbon atoms into the lattice. The critical current densities were measured and the flux pinning mechanism and its dependence on doping were analyzed. These samples exhibited higher J(c) in high magnetic fields and a narrower superconducting transition. The impact of carbon introduction on the temperature dependence of the irreversibility field H(irr)(T) and upper critical field (H(c2)) in FeSe0.5Te0.5 was investigated by studying J(c).
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Chiara Tarantini, Temidayo Abiola Oloye, S. Imam Hossain, Fumitake Kametani, Jianyi Jiang, Eric E. Hellstrom, David C. Larbalestier
Summary: Bi2Sr2CaCuOx (Bi-2212) is a high-T-c superconductor that shows promise for high-field applications. The critical current density (Jc) of Bi-2212 wires, fabricated using the powder-in-tube technique, depends on the heat treatment process. In this study, magnetic characterization techniques were used to analyze the microstructure and superconducting properties of differently processed Bi-2212 wires. The results show that the supercurrent flows at the filament bundle level, and the intergrain and intragrain superconducting properties contribute to the overall performance.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Chemistry, Physical
Jiangtao Shi, Yue Zhao, Yue Wu, Manuela Erbe, Chunjiang Guo, Jingyuan Chu, Guangyu Jiang, Jens Haenisch, Bernhard Holzapfel, Zhijian Jin
Summary: Chemical solution deposition is a widely used method for preparing rare-earth-based cuprate superconducting thin films. This paper systematically studies the factors affecting supersaturation, such as the type and stoichiometry of the rare earth element, and the sintering temperature. The results show that a small RE ionic radius and reduced rE-stoichiometry are beneficial for the growth of c-axis-oriented films at lower temperatures. In addition, a Y-O/Ba-Cu-O stacked-layer structure is proposed to regulate diffusion distance and achieve a high percentage of c-axis orientation at even lower sintering temperatures. This paper provides a new strategy for controlling the orientation of rare-earth-based cuprate superconducting thin films.
APPLIED SURFACE SCIENCE
(2023)
Review
Physics, Applied
Kazumasa Iida, Jens Hanisch, Satoshi Hata, Akiyasu Yamamoto
Summary: Since the discovery of Fe-based superconductors, efforts have been made to grow single crystals and epitaxial thin films of them for both fundamental studies and applied research. Remarkably, most Fe-based superconductors have been successfully realized in the form of epitaxial thin films. However, due to various challenges, some compounds could only be obtained as single crystals. In recent years, these issues have been solved, and those compounds have been successfully fabricated as epitaxial thin films, allowing for easier evaluation of their application potential through transport critical current measurements.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
W. Freitag, M. Erbe, J. Hanisch, B. Holzapfel
Summary: Crystallization in a sub-atmospheric reactor can achieve higher production rate with lower flow rate of carrier gas. A novel design-of-experiment technique called Definitive Screening Design was used to improve critical temperature and microstructure of ErBa2Cu3O7-d films. Lower crystallization temperature and lower total pressure were found to be beneficial, leading to increase in self-field critical current density at 77 K.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2023)
Editorial Material
Physics, Applied
Jens Haenisch
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Editorial Material
Physics, Applied
Pablo Cayado, Jens Haenisch, Kazumasa Iida, Carmine Senatore
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Vadim Grinenko, Rajib Sarkar, Shreenanda Ghosh, Debarchan Das, Zurab Guguchia, Hubertus Luetkens, Ilya Shipulin, Aline Ramires, Naoki Kikugawa, Yoshiteru Maeno, Kousuke Ishida, Clifford W. Hicks, Hans-Henning Klauss
Summary: Muon spin rotation/relaxation (μSR) and polar Kerr effect measurements provide evidence for a time-reversal symmetry breaking (TRSB) superconducting state in Sr2RuO4. However, the absence of a cusp in the superconducting transition temperature (Tc) vs stress and the absence of a resolvable specific heat anomaly at TRSB transition temperature (TTRSB) under uniaxial stress challenge a hypothesis of TRSB superconductivity. Recent μSR studies under pressure and with disorder indicate that the splitting between Tc and TTRSB occurs only when the structural tetragonal symmetry is broken. To further test such behavior, we measured Tc through susceptibility measurements and TTRSB through μSR, under uniaxial stress applied along a (110) lattice direction. We have obtained preliminary evidence for suppression of TTRSB below Tc, at a rate much higher than the suppression rate of Tc.
Article
Materials Science, Multidisciplinary
Lukas Gruenewald, Pablo Cayado, Manuela Erbe, Jens Haenisch, Bernhard Holzapfel, Dagmar Gerthsen
Summary: The mixing of rare-earth elements (REEs) into barium hafnate (BHO) nanoparticles depends on the ionic radius and the REE content of the superconducting rare-earth barium copper oxide (REBCO) phase. REEs with smaller ionic radii are more likely to be incorporated into BHO, preferentially substituting the hafnium (Hf) site. These findings have implications for optimizing REBCO performance and may apply to other barium-based perovskite nanoparticles and fabrication techniques.
MATERIALS ADVANCES
(2023)
Article
Chemistry, Multidisciplinary
Pablo Cayado, Lukas Gruenewald, Manuela Erbe, Jens Haenisch, Dagmar Gerthsen, Bernhard Holzapfel
Summary: The first CSD-grown high-entropy REBCO nanocomposite films were successfully synthesized, demonstrating promising performance at low temperatures but requiring composition optimization.
