Article
Chemistry, Physical
Xingming Zhao, Fachang Zhao, Yang Qi, Jian Zhang, Weizhen Wang, Xiaoming Lu, Chi Zhang, Fufa Wu, Mingguang Wang, Tianlin Wang
Summary: It was found that the performance of superconducting films with heterogeneous structures is significantly affected by the interface structure and strain. The interface structure and strain of a Bi2Sr2CaCu2O8+delta superconducting thin film fabricated using the sol-gel technique were investigated. The results showed that the interfacial atomic sequence and lattice mismatch relaxation methods play a role in the compressive strain of the film.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Ricci Erlandsen, Rasmus Tindal Dahm, Felix Trier, Mario Scuderi, Emiliano Di Gennaro, Alessia Sambri, Charline Kaisa Reffeldt Kirchert, Nini Pryds, Fabio Miletto Granozio, Thomas Sand Jespersen
Summary: This study reports the fabrication of freestanding oxide membranes with metallic conductivity and superconducting phases, which can be used to form devices on silicon substrates, indicating the potential for integrating oxide nanoelectronics with silicon-based architectures.
Article
Physics, Multidisciplinary
Megan Briggeman, Hyungwoo Lee, Jung-Woo Lee, Kitae Eom, Francois Damanet, Elliott Mansfield, Jianan Li, Mengchen Huang, Andrew J. Daley, Chang-Beom Eom, Patrick Irvin, Jeremy Levy
Summary: Semiconductor heterostructures and ultracold neutral atomic lattices mimic essential properties of one-dimensional electronic systems. Conductive atomic force microscope lithography on oxide interfaces can create ballistic few-mode electron waveguides. Imposed artificial Kronig-Penney-like superlattice potentials on these waveguides can fracture electronic subbands into new subbands with magnetically tunable fractional conductance.
Article
Materials Science, Multidisciplinary
Bangmin Zhang, Hong Zhang, Xiao Chi, Ping Yang, Jun Ding, Jingsheng Chen, Gan Moog Chow
Summary: Materials in low dimensions have potential in practical applications and exhibit interesting physics. The control of two-dimensional behavior in a traditional three-dimensional system is difficult. The (La0.7Sr0.3MnO3)n/(LaAlO3)n(LMSO/LAO) superlattice on a (001) SrTiO3 substrate was studied to explore its quasi-2D behavior. The number of magnetic phase transitions is related to the number of unit cells (n). The local structure of each La0.7Sr0.3MnO3 atomic layer and interface-related factors play significant roles in the multiple phase transitions and magnetic properties of the 2D-LSMO layers.
Article
Chemistry, Physical
Wenwei Song, Qizhen He, Lixiang Rao, Silong Zhang, Jibo Wang, Xuejun Ren, Qingxiang Yang
Summary: This paper investigates the interface relationship between LaAlO3 and niobium carbide and explores the possibility of LaAlO3 as a heterogeneous nucleus for refining NbC using the first principles method. The results indicate that LaAlO3 can act as a moderately heterogeneous nucleus for NbC and refine it.
APPLIED SURFACE SCIENCE
(2022)
Article
Nanoscience & Nanotechnology
Qiaohong Yan, Haobin Gao, Wei Peng, Xiaohong Zhu
Summary: Lead-free BaTiO3 film was fabricated on LaAlO3/SrTiO3 heterostructure using pulsed laser deposition. The modulation effect of back-gate voltage on the superconductivity of LAO/STO and BTO/LAO/STO heterointerfaces was studied. The results show that the back-gate voltage can adjust the resistance at high temperatures, but cannot modulate the superconducting transition temperature of LAO/STO.
Article
Materials Science, Multidisciplinary
Margherita Boselli, Gernot Scheerer, Michele Filippone, Weiwei Luo, Adrien Waelchli, Alexey B. Kuzmenko, Stefano Gariglio, Thierry Giamarchi, Jean-Marc Triscone
Summary: By comparing electric transport properties of devices made with atomic force microscope-writing technique and conventional photolithography, we found that lateral size of conducting paths strongly affects their transport behavior at low temperature, exhibiting a crossover from metallic to insulating regime at around 50K for channels narrower than 100nm. The insulating upturn can be suppressed by applying a positive backgate, and experimental observations are consistent with the physics of a quantum point contact.
Article
Physics, Applied
Yanpeng Hong, Jinshan Jia, Zitao Zhang, Shuai Wang, Ruifen Dou, Jiacai Nie, Changmin Xiong
Summary: This study reports an unusual enhancement of PPC at the LAO/STO interface achieved by EG, which is attributed to EG-induced interfacial polarization and LI-accelerated depolarization. Based on these findings, a nonvolatile memory device made by this interface is proposed.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Multidisciplinary
Xi Jian-Feng, Li Bao-He, Liu Dan, Li Xiong, Geng Ai-Cong, Li Xiao
Summary: The study focused on the influence of the LAO/STO interface on the photovoltaic effect, revealing a lateral photovoltaic effect and the higher photovoltage on the side of the sample compared to the front. The experiment also showed that irradiating on the interface side further enhances the lateral photovoltaic effect.
ACTA PHYSICA SINICA
(2021)
Article
Materials Science, Multidisciplinary
N. Lebedev, Y. Huang, A. Rana, D. Jannis, N. Gauquelin, J. Verbeeck, J. Aarts
Summary: In this paper, we studied the properties of LaAlO3/Eu1-xLaxTiO3/SrTiO3 structures and found that they have similar characteristics to previously studied LaAlO3/EuTiO3/SrTiO3 and other oxide interfaces. These include the formation of a two-dimensional electron liquid for the Eu1-xLaxTiO3 layer, a metal-insulator transition driven by the thickness of the Eu1-xLaxTiO3 layer, the presence of an anomalous Hall effect when driving the systems above the Lifshitz point with a back-gate voltage, and a minimum in the temperature dependence of the sheet resistance below the Lifshitz point in the one-band regime. However, the observed minimum in sheet resistance is not attributed to the Kondo effect, but rather to the properties of the SrTiO3 crystal and the effects of charge trapping when using back gates.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Physics, Condensed Matter
Yanqiu Sun, Yuan Liu, Wenze Pan, Yanwu Xie
Summary: The recent discovery of superconductivity at EuO (or LaAlO3)/KTaO3 interfaces has sparked significant research interest. However, there is still a lack of extensive study on the growth of these interfaces. In this work, LaAlO3 thin films were grown on KTaO3(111) single-crystalline substrates via pulsed laser deposition to fabricate LaAlO3/KTaO3(111) interfaces. The effects of growth temperature, oxygen pressure, laser fluence, and postannealing on transport properties were investigated. It was found that these key growth parameters have important effects on transport properties, and their possible mechanisms were discussed. This study provides useful knowledge for further optimization of these interfaces.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Materials Science, Multidisciplinary
Baohua Wang, Yangqing Wu, Haoming Wei, Xin Chen, Xiubing Zhang, Bingqiang Cao
Summary: In this work, high-quality LaAlO3/SrTiO3 heterostructures were prepared under different oxygen partial pressure, and the role of oxygen vacancy in the Kondo effect at LaAlO3/SrTiO3 interface was investigated. It was found that the formation of Ti3+ local moments related to oxygen vacancy can be controlled by oxygen partial pressure, resulting in a change in Kondo temperature. This work paves the way for studying the two-dimensional electron gas at the oxide interface.
Article
Materials Science, Multidisciplinary
Qing Guo, Jianan Li, Hyungwoo Lee, Jung-Woo Lee, Yuhe Tang, Muqing Yu, Yang Hu, Chang-Beom Eom, Patrick Irvin, Jeremy Levy
Summary: This study investigates the frictional drag between graphene and LAO/STO heterostructures and demonstrates pronounced fluctuations in frictional drag resistance in the superconducting region, as well as stripelike oscillations in the quantum Hall region.
Article
Chemistry, Multidisciplinary
Ong Kim Le, Viorel Chihaia, Phan Thi Hong Hoa, Pham Thanh Hai, Do Ngoc Son
Summary: Density functional theory calculations were used to investigate the interaction between Au and the LaAlO3/SrTiO3 substrate. It was found that Au adsorption increased the thickness of LaAlO3 films and resulted in an additional optical peak in a specific wavelength range.
Article
Physics, Condensed Matter
Weimin Jiang, Qiang Zhao, Zhe Zhang, Tingna Shao, Zitao Zhang, Mingrui Liu, Chunli Yao, Yujie Qiao, Meihui Chen, Xingyu Chen, Ruifen Dou, Changmin Xiong, Jiacai Nie
Summary: Modulating the Kondo phenomenon in two-dimensional materials is important. However, the strain effect, one of the effective regulation methods, is typically absent in previous studies of Kondo systems. In this study, we demonstrate that a tensile or compressive strain gradient induced by a three-point bending apparatus significantly impacts the Kondo effect of the two-dimensional electron gas at the LaAlO3/SrTiO3 heterointerface. Under the tensile strain gradient, the Kondo temperature (TK) decreases, while TK increases under the compressive strain gradient. Additionally, the temperature at which the resistance has a minimum, Tmin, exhibits the same strain gradient dependence as TK. This research may open doors for manipulating many-body effects at oxide heterointerfaces.
SOLID STATE COMMUNICATIONS
(2023)
Article
Instruments & Instrumentation
Taisei Hayashi, Kensei Ichiba, Daisuke Nakauchi, Takumi Kato, Noriaki Kawaguchi, Takayuki Yanagida
Summary: In this study, Cr-doped Mg4Ta2O9 single crystals with different doping levels were synthesized using the floating zone method, and their photoluminescence and scintillation properties were evaluated. The results showed that Cr-doped Mg4Ta2O9 single crystals exhibited broad emission bands in the near-infrared region and showed scintillation characteristics within specific wavelength ranges. Additionally, the samples with different Cr doping levels demonstrated different lower detection limits based on the dose rate response function.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2024)
Article
Instruments & Instrumentation
S. Marouf, A. C. Chami, Y. Boudouma
Summary: This study develops a Monte Carlo simulation approach to describe proton-induced secondary electron emission in solids. Theoretical modeling based on the Mott's elastic scattering cross-section and Lindhard's dielectric function was used to calculate the double differential cross-section (DDCS) of excited electrons and describe electron transport in the medium. The results for aluminum show the angular and energy distributions of backscattered electrons for incident protons with energy below 25 keV at normal incidence, and the total electron emission yield also agrees well with available measurements.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2024)
Article
Instruments & Instrumentation
Weipeng Yan, Baojun Duan, Zijian Zhu, Yan Song, Guzhou Song, Jiming Ma, Binkang Li, Yucheng Liu
Summary: This article reports on the scintillation performance of Lithium-doped 2D (PEA)2PbBr4 perovskite single crystals synthesized at room temperature. The crystals exhibit fast decay time, high light yield, and high spatial resolution, making them highly promising for medical diagnostic applications.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2024)
Article
Instruments & Instrumentation
S. B. Vishwakarma, S. K. Dubey, R. L. Dubey, I. Sulania, D. Kanjilal
Summary: Investigations have been conducted on the implanted SiO2 thin film after thermal annealing using various analytical techniques. The results revealed the absence of vacancy defects, variations in vibrational modes and the formation of new structures. The photoluminescence intensity of the annealed SiO2 samples was higher, with a decrease in non-radiative defect centers and an increase in radiative Si:SiO2 interface states. Additionally, the presence of silicon nanoclusters formed after annealing resulted in an additional radiative recombination peak. Furthermore, the formation of new SiOx structures was observed after thermal annealing.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2024)
Article
Instruments & Instrumentation
M. Koshimizu, S. Kurashima, A. Kimura, M. Taguchi
Summary: By observing the scintillation time profiles of CeF3 under irradiations of pulsed beams with different LETs, we found that the initial decay was faster for higher LET, which is consistent with previous studies on other self-activated scintillators. This faster decay at higher LET can be explained by the competition between the scintillation caused by 5d-4f transition of Ce3+ ions and quenching due to the interaction between excited Ce3+ ions close to each other.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2024)
Article
Instruments & Instrumentation
Junjie Shi, Jianhong Hao, Fang Zhang, Qiang Zhao, Bixi Xue, Jieqing Fan, Zhiwei Dong
Summary: This study examined the neutralization process and beam quality of a hydrogen beam by emitting negative hydrogen ions to a hydrogen target. The findings showed that the neutralization efficiency was influenced by variables such as the transport distance, energy, and target gas density. However, the maximal neutralization efficiency was not affected by the density of the target gas or the energy of the negative hydrogen ions.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2024)