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
Materials Science, Multidisciplinary
Jingdong Shen, Wenxiang Jiang, Fengfeng Zhu, Guan-yong Wang, Huayao Li, Gan Zhao, Qian Li, Wensheng Yan, Wanli Yang, Yi-De Chuang, Jin-feng Jia, Dong Qian, L. Andrew Wray, Lin Miao
Summary: This study investigates the electronic structures and orbital occupancies of FeSe/STO thin films with different thicknesses. The results show that 1UC FeSe/STO exhibits a more persistent 3d6 electronic configuration compared to thicker films, and the possible mechanism and its impact on high-Tc superconductivity are discussed.
Article
Materials Science, Coatings & Films
Falko Jahn, Steffen Weissmantel
Summary: Boron carbide is a super-hard material suitable for wear resistant coatings. Its hardness is significantly influenced by substrate temperature, with little effect from laser fluence.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
W. X. Wang, B. Lei, C. S. Zhu, J. H. Cui, W. Z. Zhuo, Z. J. Xiang, X. G. Luo, X. H. Chen
Summary: The electronic properties of FeSe thin flakes were successfully manipulated using a field-effect transistor with a solid proton conductor as the gate dielectric, showing three discrete superconducting phases. The study suggests that controlling the intercalated proton content can modulate physical properties and explore materials' hydrogen storage capacity.
Article
Multidisciplinary Sciences
Zheng Ren, Hong Li, He Zhao, Shrinkhala Sharma, Ziqiang Wang, Ilija Zeljkovic
Summary: Using strain-engineered FeSe thin films, we discovered a local decoupling of electron nematicity and structural anisotropy, indicating stiffness of the nematic order parameter at the nanoscale, which contrasts with previous observations in Fe-based superconductors.
NATURE COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Tianzhen Guo, Dan Wang, Yajun Yang, Xiaoyong Xiong, Kelin Li, Guanggen Zeng, Bing Li, Mohsen Ghali
Summary: CuSbSe2 has shown promising photovoltaic properties for thin film solar cells due to its environmentally friendly constituent elements. High-quality CuSbSe2 thin films were prepared by pulsed laser deposition and in-situ annealing. The results indicated a reduction in Sb2Se3 and Cu3SbSe3 content in the films after annealing, with an estimated atomic ratio of Cu:Sb:Se close to the stoichiometry ratio of CuSbSe2. The optical band gap of the annealed film met the requirements for solar cell absorber layers.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Physics, Condensed Matter
Ji-Hoon Kang, Jihyun Kim, Tae Beom Park, Woo Seok Choi, Sungmin Park, Tuson Park
Summary: We report the growth of CeIrIn5 thin films with different crystal orientations on a MgF2 (001) substrate using the pulsed laser deposition technique. The characteristic features of heavy-fermion superconductors, including Kondo coherence and superconductivity, were observed in the thin films. The successful synthesis of CeIrIn5 thin films is expected to provide a new avenue for exploring novel quantum phases.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Chemistry, Physical
Yongjian Luo, Zhenxun Tang, Xiaozhe Yin, Chao Chen, Zhen Fan, Minghui Qin, Min Zeng, Guofu Zhou, Xingsen Gao, Xubing Lu, Jiyan Dai, Deyang Chen, Jun -Ming Liu
Summary: This study demonstrates that ferroelectric properties can be observed in non-capped dopant-free HfO2 thin films by adjusting the deposition temperature, oxygen pressure, and thickness. A maximum polarization strength of 14.7 mu C/cm(2) was achieved in a 7.4 nm-thick film, suggesting a new method for fabricating high-quality ferroelectric HfO2 thin films.
JOURNAL OF MATERIOMICS
(2022)
Article
Chemistry, Physical
Stefan Andrei Irimiciuc, Sergii Chertopalov, Maksym Buryi, Zdenek Remes, Martin Vondracek, Ladislav Fekete, Michal Novotny, Jan Lancok
Summary: CuI thin films were deposited with controlled morphology, structure, and defect nature in different Ar atmospheres. Band gap tailoring was achieved by controlling the plasma ion kinetic energy. Variation in Ar pressure allowed control over the nature of vacancies. Addition of Ar resulted in preferential scattering and energy losses of Cu ions in the plasma.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Rovena Veronica Pascu, George Epurescu, Iulian Boerasu, Ana -Maria Banici Niculescu, Dumitru Manica, Alexandra Maria Isabel Trefilov, Bogdan Alexandru Sava
Summary: Samarium doped ceria thin films were successfully deposited on Si (100) substrates at 500 and 600 degrees C using Pulsed Laser Deposition. X-ray Diffraction confirmed the presence of Samarium Doped Cerium Oxide crystalline compound in the films. Atomic Force Microscopy and Scanning Electron Microscopy revealed high quality films with low roughness, especially for the sample deposited at 600 degrees C. X-ray Photoelectron Spectroscopy showed an increased proportion of Ce3+ in the deposited films compared to the target. Spectroscopic Ellipsometry analysis calculated a refractive index under 2.2 in the visible and near-infrared domain. Nanoindentation tribometric measurements indicated a decrease in elasticity modulus and hardness with increasing substrate temperature. These films show potential as electrolyte materials for new generation electrochemical devices.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Xiangnan Gong, Menglei Feng, Hong Wu, Hongpeng Zhou, Chunhung Suen, Hanjun Zou, Lijie Guo, Kai Zhou, Shijian Chen, Jiyan Dai, Guoyu Wang, Xiaoyuan Zhou
Summary: This work focuses on improving the quality of highly (100)-oriented SnSe thin films for thermoelectric applications. By controlling key parameters during pulsed-laser deposition and performing vacuum thermal annealing, the film quality was enhanced. The best crystal quality and uniform orientation were achieved on SiO2/Si substrate at 673 K followed by thermal annealing at 673 K for 30 min, showcasing promising Seebeck coefficient and power factor values.
APPLIED SURFACE SCIENCE
(2021)
Article
Multidisciplinary Sciences
Timothy Draher, Tomas Polakovic, Juliang Li, Yi Li, Ulrich Welp, Jidong Samuel Jiang, John Pearson, Whitney Armstrong, Zein-Eddine Meziani, Clarence Chang, Wai-Kwong Kwok, Zhili Xiao, Valentine Novosad
Summary: This study investigates the effects of ion beam-assisted sputtering (IBAS) on the growth of titanium nitride thin films. The results demonstrate a 10% increase in nominal critical temperature without noticeable variation in lattice structure using the IBAS technique. In addition, the behavior of superconducting critical temperature in ultra thin films is explored, with high nitrogen concentration films following theoretical predictions and low nitrogen concentration films deviating significantly from the models.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Physical
Tao Liu, Helei Dong, Hanyu Wang, Yanyan Niu, Xiangpeng Li, Lei Zhang, Jijun Xiong, Qiulin Tan
Summary: In this study, Pt-ITO thin-film thermocouples were fabricated using pulsed laser deposition on alumina ceramic substrates, and the microstructure and electrical properties were investigated. The results showed that the ITO thin films had a new type of nano cone structure, with a resistivity of only 2.76 x 10-4 omega center dot cm at a substrate temperature of 600 degrees C. The Pt-ITO thin-film thermocouples could work stably in the temperature range of 25-1300 degrees C and for a short time at 1400 degrees C. The average Seebeck coefficient was more than 50 mu V/degrees C at 1300 degrees C, and the response time was less than 435 mu s. These findings provide important insights for the potential application of Pt-ITO TFTCs in high-temperature measurement, and confirm the feasibility of preparing superior thermoelectric semiconductor materials using pulsed laser deposition.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Jing Liao, Yuhao Zhan, Qingyou Liu, Ruijin Hong, Chunxian Tao, Qi Wang, Hui Lin, Zhaoxia Han, Dawei Zhang
Summary: Al-Cu bimetallic nanoparticles thin film was fabricated by Nd:YAG fiber pulsed-laser irradiation of Al/Cu bilayers, and the effects on morphology, structure, composition, and optical properties were studied. Tunability of both localized surface plasmon resonance wavelength and intensity was achieved by adjusting the pulse shot or relative thickness of the bilayers. SEM analysis revealed that the obtained particles had a mean diameter of 36-80 nm, dependent on the Cu proportion. Surface-enhanced Raman spectroscopy measurement and FDTD simulation were used to verify the LSPR properties before and after laser irradiation.
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Jakub Holovsky, Eva Horynova, Lukas Horak, Katarina Ridzonova, Zdenek Remes, Lucie Landova, Rupendra Kumar Sharma
Summary: Molybdenum oxide is a material with high bandgap, work function, and other interesting properties. Using Pulsed Laser Deposition, researchers were able to deposit high transparency MoO3 layers from stoichiometric MoO3 and metal Mo targets at different temperatures and oxygen pressures. Optical properties were accurately tracked using Photothermal Deflection Spectroscopy and Spectral Ellipsometry, while crystallinity and surface morphology were monitored using X-ray diffraction and Scanning Electron Microscopy. Increasing temperature led to smoother, denser layers, narrowing bandgap, and increased sub-gap absorption, with crystallization occurring above 400 degrees C. Sub-gap absorption around 1000 nm depended on temperature and weakly on oxygen pressure.
Article
Chemistry, Multidisciplinary
Yulong Huang, Qiang Zhang, Yuguang C. Li, Yu Yao, Yong Hu, Shenqiang Ren
Summary: Researchers have discovered a controllable chemical tuning route to transform low-temperature magnetism into room-temperature hard magnetism in Cr(pyz)(2)center dot xLiCl center dot yTHF materials. This chemical tuning approach, achieved through electrochemical lithiation and solvation/desolvation, enables flexible control of magnetism at room temperature, with potential applications in data storage, magnetic refrigeration, and spintronics.
ADVANCED MATERIALS
(2023)
Article
Physics, Multidisciplinary
Shien Li, Zefeng Lin, Wei Hu, Dayu Yan, Fucong Chen, Xinbo Bai, Beiyi Zhu, Jie Yuan, Youguo Shi, Kui Jin, Hongming Weng, Haizhong Guo
Summary: In this study, TaAs films were grown on different substrates using pulsed laser deposition (PLD) method. It was found that partial As ions from the GaAs substrate are likely to diffuse into the TaAs films during growth, leading to improved As content and the achievement of the TaAs phase. This work presents an effective method for the fabrication of TaAs films using PLD.
Article
Engineering, Electrical & Electronic
Tao Wen, Yulong Huang, Jiuqian Chang, Yi Zhao, Xiangyu Tan
Summary: The lightning impulse (LI) test is an effective method for detecting insulation defects in gas-insulated metal-enclosed switchgear (GIS). This study examined the sensitivity of breakdown voltage to the wavefront time T-f and proposed a sensitivity coefficient k(e) to evaluate this relationship for different insulation defects. The results showed that the nonuniformity of the electric field is the key factor affecting the sensitivity coefficient k(e), and the influence of T-f becomes more significant with increasing nonuniformity. The application of the sensitivity coefficient k(e) in evaluating insulation defect detection was demonstrated, and the results confirmed the quantitative effectiveness of impulse detection for different electric field inhomogeneity coefficients.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2023)
Article
Engineering, Electrical & Electronic
Xin Yan, Zhanqing Yu, Lu Qu, Zhizheng Gan, Rong Zeng, Yulong Huang, Jian Feng, Gongyi Zhang
Summary: This article introduces a novel oscillating-commutation solid-state dc circuit breaker based on compound integrated gate-commutated thyristors (IGCTs). By combining IGCTs with different advantages, such as high current breaking and high withstand-voltage capability, the proposed dc breaker has the advantages of less breaking time, high performance, low cost, and small volume. The working principle of the proposed scheme is described in detail, and an 8 kV prototype with 7 kA current breaking ability is built to verify its feasibility.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Zhizheng Gan, Zhanqing Yu, Zipan Nie, Lu Qu, Xin Yan, Yulong Huang, Rong Zeng, Huaiguang Gu
Summary: This article proposes a coordinated interruption topology of a magnetic coupling FCL and hybrid DCCB. The influence of various parameters on the coordinated interrupting process is researched, and parameter optimization and economic analysis are carried out. Finally, a scaled test verifies the feasibility of the coordinated interruption strategy.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Chemistry, Physical
Jie Qi, Yunchi Zhao, He Huang, Yi Zhang, Haochang Lyu, Guang Yang, Jingyan Zhang, Bokai Shao, Kui Jin, Ying Zhang, Hongxiang Wei, Baogen Shen, Shouguo Wang
Summary: The interplay between the interfacial crystalline structure and Dzyaloshinskii-Moriya interaction (DMI) was investigated by Fe insertion in epitaxial Pt/Co/Ir perpendicular magnetized multilayers. The Fe/Ir interface exhibits a positive interfacial DMI (iDMI) due to the fcc crystalline structure inserted by 2 monolayers (ML) Fe, while a negative iDMI from the structure with a layer shifting of 1-ML Fe insertion. The total iDMI of the multilayers increases (decreases) due to the additive enhancement (competitive counteraction) between the iDMI of Fe/Ir and Pt/Co interfaces. Comparing the iDMI of single-crystalline and textured multilayers, the iDMI of multilayers is found to be particularly sensitive to the crystallinity nearby the heterointerfaces. This work provides important insights into the physical mechanism of iDMI and offers a viable strategy for tailoring the iDMI of multilayers through crystal engineering.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Automation & Control Systems
Zhanqing Yu, Xin Yan, Xiangyu Zhang, Lu Qu, Zhizheng Gan, Yulong Huang
Summary: This article introduces a novel HdcCB topology that combines two types of power electronic devices to achieve a large breaking capacity in dc grids, and verifies its current breaking ability through experiments. Compared with other dc circuit breakers, this novel topology has obvious advantages in cost, volume, and fewer devices.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Zhizheng Gan, Bojin Tang, Zhanqing Yu, Jinshi Wang, Lu Qu, Na Jia, Xin Yan, Mingzhu Guo, Rong Zeng, Yulong Huang
Summary: Multi-terminal flexible DC power grid is important for large-scale new energy integration, but there is limited research on multi-terminal DC circuit breakers. This paper proposes a four-terminal DC circuit breaker based on commutating path multiplexing, reducing the cost and volume of the circuit breaker. The commutation characteristics of the four-terminal hybrid DC circuit breaker equivalent prototype were tested at 10-kV voltage level, showing that it can achieve breaking of 11 kA in 2.8 ms by the natural commutation method.
IET GENERATION TRANSMISSION & DISTRIBUTION
(2023)
Article
Chemistry, Multidisciplinary
Zhaoying Dang, Feng Guo, Huan Duan, Qiyue Zhao, Yuxiang Fu, Wenjing Jie, Kui Jin, Jianhua Hao
Summary: In this study, ferroelectric-tuned synaptic transistors were designed by integrating 2D black phosphorus with a flexible ferroelectric copolymer. These transistors exhibited high mobility, low energy consumption, and reliable synaptic behaviors, such as paired-pulse facilitation and long-term depression/potentiation. Furthermore, an artificial neural network was successfully simulated for handwritten digit recognition with a high accuracy of 93.6%. These findings highlight the potential of 2D ferroelectric field-effect transistors as ideal building blocks for high-performance neuromorphic networks.
Article
Physics, Multidisciplinary
Tianzhen Zhang, Yining Hu, Wei Su, Chen Chen, Xu Wang, Dong Li, Zouyouwei Lu, Wentao Yang, Qingle Zhang, Xiaoli Dong, Rui Wang, Xiaoqun Wang, Donglai Feng, Tong Zhang
Summary: In this study, the energy and spatial characteristics of impurity-induced states in (Li1-xFex)OHFeSe were investigated using high-resolution scanning tunneling microscopy and spectroscopy. Two pairs of strong in-gap states were detected on dumbbell-shaped defects, displaying damped oscillations with different phase shifts and a direct phase-energy correlation. This study provides unprecedented experimental verification of the classical Yu-Shiba-Rusinov state.
PHYSICAL REVIEW LETTERS
(2023)
Article
Instruments & Instrumentation
L. Peis, G. He, D. Jost, G. Rager, R. Hackl
Summary: Tip-enhanced Raman spectroscopy (TERS) combines nanometer-scale inelastic light scattering and scanning probe microscopy to simultaneously collect topographic, spectroscopic, and single- and two-particle information. The authors present a home-built TERS setup with low pressure and temperature capabilities, as well as external access to light polarizations, enabling the investigation of bulk and surface materials.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Multidisciplinary Sciences
Yulong Huang, Arjun K. Pathak, Jeng-Yuan Tsai, Clayton Rumsey, Mathew Ivill, Noah Kramer, Yong Hu, Martin Trebbin, Qimin Yan, Shenqiang Ren
Summary: This study reports on the pressure-controlled interlayer magnetic coupling of molecular layered compounds via chromium-pyrazine coordination. Room-temperature long-range magnetic ordering exhibits pressure tuning, with a strong dependence on alkali metal stoichiometry and composition.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Qizhi Li, Abhishek Nag, Xiquan Zheng, Fucong Chen, Jie Yuan, Kui Jin, Yi Lu, Ke-Jin Zhou, Yingying Peng
Summary: Recently, emergent superconductivity was discovered in MgTi2O4, which is attributed to the increase of electron doping and the suppression of orbital order. Ti L-edge resonant inelastic x-ray scattering was used to study the orbital excitations in superconducting and insulating MgTi2O4 films. The results provide spectroscopic evidence for the competition between orbital order and superconductivity in MgTi2O4 and shed light on searching for novel superconductors in spinel oxides.
Letter
Chemistry, Physical
Jie Qi, Yunchi Zhao, He Huang, Yi Zhang, Haochang Lyu, Guang Yang, Jingyan Zhang, Bokai Shao, Kui Jin, Ying Zhang, Hongxiang Wei, Baogen Shen, Shouguo Wang
Summary: The interplay between the interfacial crystalline structure and Dzyaloshinskii-Moriya interaction (DMI) was studied in Fe-inserted Pt/Co/Ir perpendicular magnetized multilayers. It was found that the Fe/Ir interface exhibits positive interfacial DMI (iDMI) with 2 ML Fe insertion, while negative iDMI with a layer shifting of 1-ML Fe insertion. The total iDMI of the multilayers increases (decreases) due to the additive enhancement (competitive counteraction) between the iDMI of Fe/Ir and Pt/Co interfaces. The crystallinity nearby the heterointerfaces was found to significantly affect the iDMI of the multilayers. This work provides valuable insights into the physical mechanism of iDMI and offers a viable strategy for tailoring the iDMI of multilayers through crystal engineering.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)