Article
Chemistry, Physical
Surajit Dutta, Vivas Bagwe, Gorakhnath Chaurasiya, A. Thamizhavel, Rudheer Bapat, Pratap Raychaudhuri, Sangita Bose
Summary: This study presents the growth, characterization, and superconducting properties of a new amorphous superconductor, RexZr (x approaching 6), in thin films. It was found that films with thickness greater than 40 nm exhibited a superconducting transition temperature of 5.9 K, with marginal changes in superconducting properties as the film thickness decreased to 8 nm. Scanning tunneling spectroscopy and penetration depth measurements supported the evidence for a single-gap strong coupling s-wave superconductor.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Multidisciplinary Sciences
Chao Yang, Haiwen Liu, Yi Liu, Jiandong Wang, Dong Qiu, Sishuang Wang, Yang Wang, Qianmei He, Xiuli Li, Peng Li, Yue Tang, Jian Wang, X. C. Xie, James M. Valles, Jie Xiong, Yanrong Li
Summary: Fermi liquid theory is the basis for understanding metals, but some quantum materials exhibit strange-metallic behavior that deviates from the traditional theory. This study shows that strange-metal properties also exist in a bosonic system, suggesting the presence of a fundamental principle governing transport beyond particle statistics.
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
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
Chemistry, Physical
Zhiqiang Cao, Longqing Chen, Zhenxiang Cheng, Wenbin Qiu
Summary: By coating non-superconducting FeSe ultrathin films (~8 nm) grown on calcium fluoride substrates with an optimized amount of Mg via a simple in-situ technique, the transition from insulator to superconductor was achieved, with a critical temperature of 9.7 K and an upper critical field of 30.9 T. The revival of superconductivity in FeSe films is mainly attributed to the highly crystallized FeSe and extra electron doping from the external Mg-coating process. This work provides a new strategy for inducing superconductivity in FeSe films with non-superconducting behavior, contributing to a more comprehensive understanding of iron-based superconductivity and benefiting downstream applications such as magnetic resonance imaging, high-field magnets, and electrical cables.
Article
Nanoscience & Nanotechnology
Fei Yu, R. Paxton Thedford, Konrad R. Hedderick, Guillaume Freychet, Mikhail Zhernenkov, Lara A. Estroff, Katja C. Nowack, Sol M. Gruner, Ulrich B. Wiesner
Summary: Recent developments in quantum materials have shown promise in revolutionizing energy and information technologies. By utilizing block copolymers and niobia sol precursors, we successfully prepared mesoporous niobium carbonitride thin film superconductors through a scalable solution processing approach. This cost-effective and scalable method holds great potential for integration into existing microelectronics processing, combining the capabilities of soft matter self-assembly with quantum materials.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Materials Science, Multidisciplinary
V Gayathri, E. P. Amaladass, Geetha T. Kumary, Awadhesh Mani
Summary: The study found that Pb substitution strengthens the pinning of vortices in the superconducting slab, leading to an enhanced pinning potential in thin film samples, while the anisotropy behavior of the films is influenced by the interplay of Pb-assisted cation chemistry.
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
Physics, Applied
Patrick Barfield, Vinh Tran, Vikram Nagarajan, Maya Martinez, Amirari Diego, Derek Bergner, Alessandra Lanzara, James G. Analytis, Claudia Ojeda-Aristizabal
Summary: In this work, nanoflake of alpha-RuCl3 was studied through high impedance measurements. The results showed a significant change in transport mechanism at low temperatures and the observation of excitations predicted by the Kitaev-Heisenberg model. This work demonstrated the possibility of realizing the predicted excitations in alpha-RuCl3 at low temperatures and provided information about the transport mechanisms in this material in a wide temperature range.
APPLIED PHYSICS LETTERS
(2023)
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
Materials Science, Multidisciplinary
M. Frachet, P. Wiecki, T. Lacmann, S. M. Souliou, K. Willa, C. Meingast, M. Merz, A-A Haghighirad, M. Le Tacon, A. E. Bohmer
Summary: In this work, we investigate the electronic nematicity of BaNi2(As1-xPx)(2) using electronic transport under strain. We observe a uniaxial electronic instability that drives the orthorhombic transition in the material. The elastoresistance is strongly enhanced in the presence of an incommensurate charge density wave, suggesting a correlation between the electronic instability and the material's electronic properties. Our results provide a highly strain-sensitive platform for studying electronic anisotropy induced by charge-density-wave instability.
NPJ QUANTUM MATERIALS
(2022)
Article
Physics, Applied
Ha Kim, Su-Bok Ri, Sung-Gyu Pak
Summary: This study presents a strong-coupling analysis of the competition and interplay between the DDW and DSC states, revealing a new DDW state with phase fluctuations induced by spin fluctuations. The density of states in this new state shows a pseudogap, which varies in strength based on doping levels. The study also uncovers new insights into the reduction and enhancement of Tc in different DDW states, as well as the coexistence of ordered DDW and DSC states below Tc, shedding light on the pseudogap and high-Tc superconductivity in cuprates.
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
(2021)
Article
Physics, Applied
Takumu Iwanaka, Toshiaki Kusunoki, Hiroshi Kotaki, Motomune Kodama, Hideki Tanaka, Akiyoshi Matsumoto, Shigeru Horii, Iwao Kawayama, Toshiya Doi
Summary: A new in situ process for depositing MgB2 film was developed using hybrid deposition on a heated copper substrate, followed by high-temperature post-annealing to enhance critical current density (J ( c )). By depositing MgB2 film at 360 degrees C using hybrid deposition and post-annealing at 430 degrees C, the J ( c ) was significantly improved under various magnetic field conditions. Incorporating hybrid deposition in processing with a reel-to-reel machine is expected to facilitate the synthesis of high-J ( c ), long MgB2-thin-film superconducting wires.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Condensed Matter
Miao Meng, Siqian Liu, Dongsheng Song, Xi Zhang, Haifeng Du, Haoliang Huang, Huaying Liu, Zhangao Sun, Chenguang Mei, Huaixin Yang, Huanfang Tian, Yalin Lu, Yuzhong Zhang, Jianqi Li, Yonggang Zhao
Summary: This study investigates the temperature dependences of resistivity, Hall effect and magnetoresistance of FeTe thin films with different amounts of excess Fe and oxygen. The results show that the oxygen-annealed samples exhibit positive Hall coefficients, while the vacuum-annealed samples transition from positive to negative below 50 K. Both the resistivity and Hall coefficient of all samples display a significant drop at around 50 K-75 K, indicating the coexistence of superconductivity and antiferromagnetic order in the oxygen-annealed samples. Additionally, the oxygen-annealed samples show dominant negative magnetoresistance, while the vacuum-annealed samples exhibit both positive and negative values. Oxygen annealing is found to reduce the excess Fe in FeTe, which has been previously overlooked. The findings are discussed in relation to the understanding of oxygen-annealed FeTe thin films in comparison with FeSe1-x Te (x).
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
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)
Correction
Chemistry, Applied
M. Rasadujjaman, Y. Wang, L. Zhang, S. Naumov, A. G. Attallah, M. O. Liedke, N. Koehler, M. Redzheb, A. S. Vishnevskiy, D. S. Seregin, Y. Wu, J. Zhang, J. Leu, A. Wagner, K. A. Vorotilov, S. E. Schulz, M. R. Baklanov
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Chemistry, Physical
Md Rasadujjaman, Xuesong Wang, Yanrong Wang, Jing Zhang, Valeriy E. Arkhincheev, Mikhail R. Baklanov
Summary: The study investigates the preparation and properties of organosilicate glass-based porous low dielectric constant films. It is found that films containing benzene bridging groups exhibit higher Young’s modulus and good hydrophobic properties. The films show good stability after a hard bake.
Article
Physics, Applied
Elmira M. Baeva, Nadezhda A. Titova, Louis Veyrat, Benjamin Sacepe, Alexander Semenov, Gregory N. Goltsman, Anna Kardakova, Vadim S. Khrapai
Summary: The research findings indicate that in thin films on amorphous insulating substrates, the relationship between the Joule power P2D and electron temperature Te is influenced by the length of the amorphous insulating layer, showing a linear temperature dependence related to thermal conductivity.
PHYSICAL REVIEW APPLIED
(2021)
Article
Materials Science, Multidisciplinary
Yingying Hu, Md Rasadujjaman, Yanrong Wang, Jing Zhang, Jiang Yan, Mikhail R. Baklanov
Summary: The influence of different N-2 flow rates on Ta(N) films was studied, revealing that increasing N-2 flow rates decrease the deposition rate and increase resistivity. Crystal structure transitions from beta-Ta to TaN(111) and finally to the N-rich phase Ta3N5(130, 040) as N-2 flow rates increase. Optical properties, specifically refractive index and extinction coefficient of Ta(N), differ with thickness and N-2 flow rates, depending on crystal size and phase structure.
Article
Optics
V. N. Kruchinin, V. A. Volodin, S. V. Rykhlitskii, V. A. Gritsenko, I. P. Posvirin, Xiaoping Shi, M. R. Baklanov
Summary: The SiCOH low-k dielectric film grown on a Si substrate was studied for its atomic structure and optical properties using various techniques. Analysis showed the film consists of Si-O-4 and Si-SiO3 bonds, with Raman spectroscopy revealing the presence of local Si-Si and C-C bonds. Ellipsometry data indicated high homogeneity in thickness but also revealed the film's porous nature.
OPTICS AND SPECTROSCOPY
(2021)
Article
Engineering, Electrical & Electronic
T. Perevalov, A. A. Gismatulin, V. A. Gritsenko, H. Xu, J. Zhang, K. A. Vorotilov, M. R. Baklanov
Summary: This study analyzes four bulk-limited models of charge transport and finds that phonon-assisted electron tunneling can explain the experimental results reasonably, with a thermal trap energy value of 1.2 eV. The trap nature is discussed, as well as a comparison with low-k films prepared using spin-on-glass technology.
JOURNAL OF ELECTRONIC MATERIALS
(2022)
Article
Physics, Applied
D. Lopaev, A. Zotovich, S. M. Zyryanov, M. A. Bogdanova, T. Rakhimova, Y. A. Mankelevich, N. N. Novikova, D. S. Seregin, A. S. Vishnevskiy, K. A. Vorotilov, Xiaoping Shi, M. R. Baklanov
Summary: The effects of hydrogen atoms and UV radiation on nanoporous organosilicate glass low-k films were studied. It was found that exposure to hydrogen atoms at low temperature caused slight modification of hydrocarbon bonds in hydrocarbon residues, while high temperature led to the destruction of Si-O and Si-CH2 groups. Additionally, the temperature increase also resulted in slight modification of the matrix structure. UV radiation had almost no effect on these processes.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Sathyan Sandeep, Alexey S. Vishnevskiy, Samuel Raetz, Sergej Naumov, Dmitry S. Seregin, Artem Husiev, Konstantin A. Vorotilov, Vitalyi E. Gusev, Mikhail R. Baklanov
Summary: The characterization of porogen-based organosilicate glass (OGS) films deposited by spin-on-glass technology was carried out using time-domain Brillouin scattering (TDBS). Remarkable differences between the films were revealed through the temporal evolution of the Brillouin frequency (BF) shift in TDBS experiments. The observed modification of the BF was correlated to the amount of carbon residue in the samples, the use of ultraviolet (UV) femtosecond probe laser pulses, and their intensity. The possibility of local modifications of OSG films with a nanometric resolution via nonlinear optical processes was demonstrated.
Article
Materials Science, Multidisciplinary
A. A. Rezvanov, A. S. Vishnevskiy, D. S. Seregin, D. Schneider, A. A. Lomov, K. A. Vorotilov, M. R. Baklanov
Summary: The critical properties of porous periodic mesoporous silica low-k dielectric with different ratios of benzene bridges and methyl terminal groups were studied using advanced instrumentations such as Ellipso-metric Porosimetry, Surface Acoustic Wave Spectroscopy, and Specular X-ray reflectivity. The increase in benzene bridge concentration was found to decrease pore size and surface roughness, increase dielectric constant, and improve mechanical properties. Additionally, a percolation-type behavior of Young's modulus was observed with a sharp increase near a 50 mol % concentration of the benzene bridge.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Physics, Applied
Alexander O. Serov, Alexey N. Ryabinkin, Alexey S. Vishnevskiy, Sergej Naumov, Alexander F. Pal, Tatyana V. Rakhimova, Dmitry S. Seregin, Konstantin A. Vorotilov, Mikhail R. Baklanov
Summary: The degradation of a porous organosilicate glass low-k dielectric during ionized physical vapor deposition of tantalum coating is mainly caused by vacuum UV flux from the argon inductively coupled plasma, not by direct current magnetron sputter plasma. The damage is associated with the removal of carbon-containing groups and breaking of Si-O bonds, resulting in the formation of hydrophilic Si-OH and Si-H groups. Therefore, the degree of damage can exceed expectations.
PLASMA PROCESSES AND POLYMERS
(2023)
Article
Chemistry, Multidisciplinary
Md Rasadujjaman, Jinming Zhang, Dmitry A. Spassky, Sergej Naumov, Alexey S. Vishnevskiy, Konstantin A. Vorotilov, Jiang Yan, Jing Zhang, Mikhail R. Baklanov
Summary: The UV-induced photoluminescence of organosilica films with specific chemical groups was studied to understand the nature and origin of optically active defects. It was found that the sources of luminescence were carbon-containing components and carbon residues formed during the sample preparation process. A good correlation between the photoluminescence peaks and chemical composition was observed. The intensity of photoluminescence increased with porosity and internal surface area, and additional bands appeared after annealing, indicating changes in the matrix and segregation of residues on the surface.
Review
Materials Science, Coatings & Films
Mikhail R. Baklanov, Konstantin P. Mogilnikov, Alexey S. Vishnevskiy
Summary: The review article provides an overview of important techniques for evaluating the porosity of thin films. These methods include ellipsometric porosimetry (EP), positron annihilation spectroscopy (PAS/PALS), and grazing incidence small-angle x-ray scattering (GISAXS). The article highlights the challenges and limitations of each method and demonstrates their unique insights into pore structure. The cross-evaluation of different methods enhances understanding of complex pore structures and emphasizes the importance of appropriate data modeling and interpretation.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2023)
Article
Materials Science, Multidisciplinary
Md Rasadujjaman, Jinming Zhang, Alexey S. Vishnevskiy, Jing Zhang, Mikhail R. Baklanov
Summary: Eu-doped periodic mesoporous organosilicate (PMO) films have been successfully synthesized using sol-gel technology and spin-coating. The Eu doping alters the properties of the films and introduces luminescence emission. This study is significant for the development of novel functional organosilica materials.
Article
Engineering, Electrical & Electronic
Alexey Zotovich, Sergey M. Zyryanov, Dmitry Lopaev, Askar A. Rezvanov, Ahmed G. Attallah, Maciej O. Liedke, Maik Butterling, Maria A. Bogdanova, Alexey S. Vishnevskiy, Dmitry S. Seregin, Dmitry A. Vorotyntsev, Alexander P. Palov, Eric Hirschmann, Andreas Wagner, Sergej Naumov, Konstantin A. Vorotilov, Tatyana Rakhimova, Alexander T. Rakhimov, Mikhail R. Baklanov
Summary: This study investigates the modification of spin-on-deposited porous PMO ultralow-k SiCOH films by vacuum ultraviolet (VUV) emission. The results show that the VUV exposure process can be divided into two phases, with the first phase resulting in the removal of surface methyl and matrix bridging groups. This leads to increased material porosity. In the second phase, there is an increase in mesopore size, which is masked by air exposure.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Article
Multidisciplinary Sciences
Md Rasadujjaman, Jinming Zhang, Konstantin P. Mogilnikov, Alexey S. Vishnevskiy, Jing Zhang, Mikhail R. Baklanov
Summary: The report presents data on porous organosilicate glass films with different structures obtained by Fourier-Transform Infrared spectroscopy, Ellipsometric Porosimetry, and Photoluminescence. The mechanical properties of these films are shown to be primarily controlled by organic groups in different structures and proper pore sizes.