Article
Materials Science, Multidisciplinary
C. Y. Tang, Z. F. Lin, J. X. Zhang, X. C. Guo, Y. G. Zhong, J. Y. Guan, S. Y. Gao, Z. C. Rao, J. Zhao, Y. B. Huang, T. Qian, Z. Y. Weng, K. Jin, Y. J. Sun, H. Ding
Summary: In this study, in situ ARPES measurements were performed on La2-xCexCuO4+/-delta (LCCO) thin films, revealing the phenomenon of the kink in the band dispersion of cuprates at different electron doping levels. An antinodal kink above 200K was observed, independent of doping level.
NPJ QUANTUM MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
C. Y. Tang, Z. F. Lin, J. X. Zhang, X. C. Guo, J. Y. Guan, S. Y. Gao, Z. C. Rao, J. Zhao, Y. B. Huang, T. Qian, Z. Y. Weng, K. Jin, Y. J. Sun, H. Ding
Summary: Systematic angle-resolved photoemission spectroscopy measurements on T'La2-xCexCuO4+/-delta (LCCO) thin films revealed a variation in electron doping levels, affecting the Fermi surface volume and suppressing antiferromagnetic order in LCCO. This suppression may be attributed to enhanced next-nearest-neighbor hopping in LCCO due to the largest La3+ ionic radius among lanthanide elements.
Article
Multidisciplinary Sciences
Gideok Kim, Ksenia S. Rabinovich, Alexander Boris, Alexander N. Yaresko, Y. Eren Suyolcu, Yu-Mi Wu, Peter A. van Aken, Georg Christiani, Gennady Logvenov, Bernhard Keimer
Summary: By using atomic layer-by-layer oxide molecular beam epitaxy, epitaxial thin films of La2-xCaxCuO4 with x up to 0.5 were successfully grown, exhibiting superconductivity with Tc of 15 to 20 K. The nearly identical radii of La and Ca ions in the material were found to minimize the impact of structural disorder, leading to an extended superconducting dome in the phase diagram of cuprates.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Chemistry, Multidisciplinary
Irene Lucas, Noelia Marcano, Thomas Prokscha, Cesar Magen, Ruben Corcuera, Luis Morellon, Jose M. De Teresa, M. Ricardo Ibarra, Pedro A. Algarabel
Summary: This article provides a comprehensive magnetic characterization of the strain-induced segregated non-ferromagnetic layer (NFL), revealing spin glass behavior and confirming this through low-energy muon spectroscopy experiments.
Article
Chemistry, Physical
Yu Yun, Pratyush Buragohain, Ming Li, Zahra Ahmadi, Yizhi Zhang, Xin Li, Haohan Wang, Jing Li, Ping Lu, Lingling Tao, Haiyan Wang, Jeffrey E. Shield, Evgeny Y. Tsymbal, Alexei Gruverman, Xiaoshan Xu
Summary: Ferroelectricity can be achieved in epitaxial HfO2 films with high structural order, indicating that it is an intrinsic property of HfO2-based materials. This discovery has significant implications for optimizing the performance of HfO2-based materials in device applications.
Article
Chemistry, Physical
Sukalyan Shyam, Debajyoti Das
Summary: P-doped nc-SiOxCy:H films were grown at moderate conditions, showing the systematic formation of Si-C and Si-O-C bonds with the increase in CH4 flow rate. XPS studies confirmed the presence of Si-O-C bonds and P atoms as dopants in the network, while the optical band gap was enhanced by the addition of stronger Si-C bonds and quantum confinement effect from reduced nanocrystal size. The optimal n-type nc-SiOxCy:H film exhibited promising properties for use in all-Si tandem solar cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Physics, Applied
I Zajcewa, M. Chrobak, K. Mackosz, M. Jurczyszyn, R. Minikayev, A. Abaloszew, Marta Z. Cieplak
Summary: The temperature dependence of resistance and current-voltage characteristics were examined on La1.952Sr0.048CuO4 films with different thickness and built-in compressive strain. The strain induced an inhomogeneous superconducting state in the films, with a two-step transition. As the films were further cooled, the superfluid density decreased and global phase coherence was not achieved. Instead, an increase in resistance, reaching saturation at lowest temperatures, was observed in the thinner and more strained film. The saturation was accompanied by Coulomb blockade, suggesting a local character of pairing in the insulating state.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Yati Maryati, Suci Winarsih, Muhammad Abdan Syakuur, Maykel Manawan, Togar Saragi, Risdiana
Summary: In this study, electron-doped superconducting cuprate of Eu2-xCexCuO4+alpha-delta was investigated to explore the relation between crystal structure and hopping conduction in the normal state. It was found that the Eu-O bond length decreases with increasing doping concentration, indicating successful doping. The resistivity increases with decreasing temperature, suggesting a bad metal-like behavior. The temperature dependence of resistivity was analyzed using the Arrhenius law and the variable range hopping model, with the latter showing a better fit to the experimental data.
Article
Chemistry, Physical
Yogesh Kumar, Akhil Tayal, Wolfgang Caliebe, Mukul Gupta
Summary: This study investigates the diffusion of nitrogen in cobalt mononitride thin films and the impact of carbon doping on this process to improve thermal stability. The experimental results demonstrate changes in nitrogen concentration and sample structure with increasing carbon doping, leading to enhanced thermal stability. This research provides insights for potential applications in the energy sector utilizing cobalt mononitride in various devices such as Li-ion batteries and solar cells.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Yati Maryati, Suci Winarsih, Muhammad Abdan Syakuur, Maykel Manawan, Togar Saragi, Risdiana
Summary: In this study, the crystal structure and the conduction behavior in the normal state of electron-doped superconducting cuprate of Eu2-xCexCuO4+alpha-delta were investigated by reducing the oxygen content in the whole doping regime. It was found that the Eu-O bond length decreases with increasing doping concentration, indicating successful doping. The resistivity was found to increase with decreasing temperature, and the hopping conduction mechanism was more likely to follow the variable range hopping model.
Article
Polymer Science
Carmen Steluta Ciobanu, Ionela Cristina Nica, Anca Dinischiotu, Simona Liliana Iconaru, Patrick Chapon, Bogdan Bita, Roxana Trusca, Andreea Groza, Daniela Predoi
Summary: In this study, dextran coated cerium doped hydroxyapatite (Ca(10-x)Cex(PO4)(6)(OH)(2)) thin films were successfully deposited on Si substrates by radio frequency magnetron sputtering technique. The morphology, composition, structure, and biocompatibility of the coatings were investigated using various characterization techniques. The results showed that the coatings had smooth surfaces, identified composition elements, and exhibited good biocompatibility.
Article
Polymer Science
Bogdan Butoi, Carmen Steluta Ciobanu, Simona Liliana Iconaru, Constantin Catalin Negrila, Madalina Andreea Badea, Mihaela Balas, Anca Dinischiotu, Gabriel Predoi, Bogdan Bita, Andreea Groza, Daniela Predoi
Summary: Iron-oxide-doped polyaniline (PANI-IO) thin films were successfully synthesized through the polymerization of aniline monomers and iron oxide solutions in plasma. The films exhibited a uniform distribution of iron oxide particles and constituent elements. The surface morphology of PANI-IO films was uniformly distributed and continuous. The in vitro biocompatibility assessments showed no significant modification to the viability of cells cultured on PANI-IO coatings.
Article
Chemistry, Physical
Sandeep Kumar Chaluvadi, Zhe Wang, Laryssa M. Carvalho de Araujo, Pasquale Orgiani, Vincent Polewczyk, Giovanni Vinai, Olivier Rousseau, Victor Pierron, Alain Pautrat, Bernadette Domenges, Darrell G. Schlom, Laurence Mechin
Summary: This research successfully integrated high-quality LSMO thin films onto SOS substrates using advanced thin film growth techniques. Detailed characterizations showed competitive properties of the LSMO films. The fabrication of suspended micro-bridges through silicon micromachining demonstrated the potential use of LSMO magnetic layer on industrially compatible SOS substrates for applicative MEMS devices.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Sungyeon Heo, Kwangdong Roh, Fengyu Zhang, Steven E. Tignor, Andrew B. Bocarsly, Antoine Kahn, Barry P. Rand
Summary: Electrochemical n-doping of halide perovskites is challenging due to limited electrochemical stability. In this study, we report the successful electrochemical n-doping of CsPbBr3 nanocrystal films within stable potential windows. The nanocrystal films show enhanced n-doping properties compared to bulk films, and the n-doped films exhibit Fermi level shifts and increased conductivity and photoluminescence intensity.
ACS ENERGY LETTERS
(2022)
Article
Chemistry, Physical
WooJun Seol, Gopinathan Anoop, Hyeonghun Park, Cheol Woong Shin, Jun Young Lee, Tae Yeon Kim, Wan Sik Kim, Hyunjin Joh, Shibnath Samanta, Ji Young Jo
Summary: In this study, V-doped ZnO thin films with high polarization values were successfully prepared by controlling crystallite size, morphology, and valence state of vanadium, opening up the possibility of utilizing ferroelectric VeZnO in particulate matter filtering devices. The study demonstrated the importance of crystalline properties and valence state of V in determining the ferroelectric and dielectric properties of VeZnO films, with potential applications in air filter coatings for efficient particulate matter filtration.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Multidisciplinary Sciences
Jie Yuan, Qihong Chen, Kun Jiang, Zhongpei Feng, Zefeng Lin, Heshan Yu, Ge He, Jinsong Zhang, Xingyu Jiang, Xu Zhang, Yujun Shi, Yanmin Zhang, Mingyang Qin, Zhi Gang Cheng, Nobumichi Tamura, Yi-feng Yang, Tao Xiang, Jiangping Hu, Ichiro Takeuchi, Kui Jin, Zhongxian Zhao
Summary: The research uncovers the precise quantitative scaling laws among the superconducting transition temperature, the linear-in-T scattering coefficient, and the doping level in electron-doped copper oxide La2-xCexCuO4, suggesting a common mechanism of the strange-metal behavior and unconventional superconductivity in these systems.
Article
Materials Science, Ceramics
Tingyu Chen, Yudong Xia, Ruipeng Zhao, Dong Wu, Zhongpei Feng, Jingting Yang, Jijun Xin, Wei Wang, Kui Jin, Bowan Tao
Summary: The influence of film composition on the performance of YBCO thin films was thoroughly studied. By adjusting the composition ratio within the optimal range, high-performance films were obtained with high critical current density and low microwave surface resistance.
CERAMICS INTERNATIONAL
(2022)
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
C. Y. Tang, Z. F. Lin, J. X. Zhang, X. C. Guo, Y. G. Zhong, J. Y. Guan, S. Y. Gao, Z. C. Rao, J. Zhao, Y. B. Huang, T. Qian, Z. Y. Weng, K. Jin, Y. J. Sun, H. Ding
Summary: In this study, in situ ARPES measurements were performed on La2-xCexCuO4+/-delta (LCCO) thin films, revealing the phenomenon of the kink in the band dispersion of cuprates at different electron doping levels. An antinodal kink above 200K was observed, independent of doping level.
NPJ QUANTUM MATERIALS
(2022)
Article
Physics, Applied
Ruozhou Zhang, Zhanyi Zhao, Mingyang Qin, Juan Xu, Wenxin Cheng, Yangmu Li, Qihong Chen, Jie Yuan, Kui Jin
Summary: The presence of a dead layer without superconductivity at the interface between substrate and superconducting film can significantly degrade the performance of superconducting devices at microwave frequencies. A new method using the two-coil mutual-inductance technique is proposed to determine the thickness of the dead layer, which is crucial for accurately measuring the magnetic penetration depth in superconducting films. The results obtained using this method on FeSe films show good agreement with the absence of diamagnetism in the films.
PHYSICAL REVIEW APPLIED
(2022)
Article
Multidisciplinary Sciences
Zefeng Lin, Sijia Tu, Juan Xu, Yujun Shi, Beiyi Zhu, Chao Dong, Jie Yuan, Xiaoli Dong, Qihong Chen, Yangmu Li, Kui Jin, Zhongxian Zhao
Summary: The study established a complete phase diagram of FeyTe1-xSex through high-throughput film synthesis technology, allowing for continuous tuning of chemical compositions and lattice parameters, and successfully fabricated a film covering the entire range of Se content. These films provide an ideal platform for studying the relationship between superconductivity and magnetism.
Article
Materials Science, Multidisciplinary
Xiaolei Hu, Zhengran Wu, Zhilin Li, Qiunan Xu, Kun Chen, Wei Hu, Zhuang Ni, Kui Jin, Hongming Weng, Ling Lu
Summary: A high-throughput search revealed 381 candidates for lossless metals, including the superconductor lithium titanate. Many candidates were found to be insulators due to limitations in current theory.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Yueming Wang, Jie Lian, Mingyang Wei, Yujun Shi, Kui Jin, Chenlin Wang, Yu Zhang, Zhen Xu, Xiang'an Zhou, Yongfu Li
Summary: This study focuses on the physical properties of β-FeSe superconductor. FeSe films were prepared on different substrates using pulsed laser deposition technique, and their properties were analyzed through various experimental methods and models. The results show that the pseudogap of FeSe films is negatively correlated with the superconducting transition temperature.
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
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
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
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)
Article
Materials Science, Multidisciplinary
Zhuang Ni, Wei Hu, Qinghua Zhang, Yanmin Zhang, Peiyu Xiong, Qian Li, Jie Yuan, Qihong Chen, Beiyi Zhu, Hua Zhang, Xiaoli Dong, Lin Gu, Kui Jin
Summary: Titanium oxide superconductors exhibit intriguing phenomena and provide an ideal platform for studying the pairing mechanism of high-temperature superconductors. Researchers have successfully fabricated superconducting Mg-Ti-O films with an unexpected structure and found the highest zero resistance transition temperature in a specific orientation. The unstable structure in bulk becomes favorable due to interfacial strain.
Article
Materials Science, Multidisciplinary
Yanmin Zhang, Luo Yan, Wei Wu, Ge He, Jingsong Zhang, Zhuang Ni, Xingyu Jiang, Mingyang Qin, Feng Jin, Jie Yuan, Beiyi Zhu, Qihong Chen, Liujiang Zhou, Yangmu Li, Jianlin Luo, Kui Jin
Summary: This study investigates the phonon modes and electron-phonon coupling in superconductor WP using angle-resolved polarized Raman spectroscopy. The results indicate that low-frequency phonon modes play a crucial role in superconductivity.
