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Cerqueira TFT, Sanna A, Marques MAL. Sampling the Materials Space for Conventional Superconducting Compounds. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2307085. [PMID: 37985412 DOI: 10.1002/adma.202307085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Revised: 11/03/2023] [Indexed: 11/22/2023]
Abstract
A large scale study of conventional superconducting materials using a machine-learning accelerated high-throughput workflow is performed, starting by creating a comprehensive dataset of around 7000 electron-phonon calculations performed with reasonable convergence parameters. This dataset is then used to train a robust machine learning model capable of predicting the electron-phonon and superconducting properties based on structural, compositional, and electronic ground-state properties. Using this machine, the transition temperatures (Tc ) of approximately 200 000 metallic compounds are evaluated, all of which are on the convex hull of thermodynamic stability (or close to it) to maximize the probability of synthesizability. Compounds predicted to have Tc values exceeding 5 K are further validated using density-functional perturbation theory. As a result, 541 compounds with Tc values surpassing 10 K, encompassing a variety of crystal structures and chemical compositions, are identified. This work is complemented with a detailed examination of several interesting materials, including nitrides, hydrides, and intermetallic compounds. Particularly noteworthy is LiMoN2 , which is predicted to be superconducting in the stoichiometric trigonal phase, with a Tc exceeding 38 K. LiMoN2 has previously been synthesized in this phase, further heightening its potential for practical applications.
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Affiliation(s)
- Tiago F T Cerqueira
- CFisUC, Department of Physics, University of Coimbra, Rua Larga, Coimbra, 3004-516, Portugal
| | - Antonio Sanna
- Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120, Halle, Germany
| | - Miguel A L Marques
- Research Center Future Energy Materials and Systems of the University Alliance Ruhr, Faculty of Mechanical Engineering, Ruhr University Bochum, Universitätsstraße 150, D-44801, Bochum, Germany
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2
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Yang CM, Chang YC, Chang CL, Chen IG. Sintering Nano-Silver Paste by Resistive Joule Heating Process for 2G HTS Tape Joints. MATERIALS 2022; 15:ma15041571. [PMID: 35208113 PMCID: PMC8876056 DOI: 10.3390/ma15041571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/24/2021] [Revised: 02/16/2022] [Accepted: 02/17/2022] [Indexed: 11/26/2022]
Abstract
Developing a joining technology for 2G HTS tapes without significantly reducing their superconducting property is crucial for numerous applications (MRI, motor/generator, power transmission, etc.). In this study, low sintering temperature (~230 °C) nano-silver paste was used as solder to join two 2G HTS tapes. In addition, two heating methods, i.e., furnace heating (heat flux outside-in) and resistive Joule heating (heat flux inside-out), were studied. This study indicates that the heat flux from internal by resistive Joule heating method shows less deteriorating impact to the 2G RE-Ba-Cu-O tape (RE: rare earth element) during the sintering process with the best specific resistance of 0.074 μΩ∙cm2 and Ic retention percentage of 99% (i.e., Ic reduced from 100 A before joining to 99 A after joining). This study indicates that nano-silver paste together with resistive Joule heating can possibly be used as soldering materials to join 2G HTS tapes.
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3
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Falson J, Xu Y, Liao M, Zang Y, Zhu K, Wang C, Zhang Z, Liu H, Duan W, He K, Liu H, Smet JH, Zhang D, Xue QK. Type-II Ising pairing in few-layer stanene. Science 2020; 367:1454-1457. [DOI: 10.1126/science.aax3873] [Citation(s) in RCA: 55] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Accepted: 02/27/2020] [Indexed: 01/14/2023]
Abstract
Spin-orbit coupling has proven indispensable in the realization of topological materials and, more recently, Ising pairing in two-dimensional superconductors. This pairing mechanism relies on inversion symmetry–breaking and sustains anomalously large in-plane polarizing magnetic fields whose upper limit is predicted to diverge at low temperatures. Here, we show that the recently discovered superconductor few-layer stanene, epitaxially strained gray tin (α-Sn), exhibits a distinct type of Ising pairing between carriers residing in bands with different orbital indices near the Γ-point. The bands are split as a result of spin-orbit locking without the participation of inversion symmetry–breaking. The in-plane upper critical field is strongly enhanced at ultralow temperature and reveals the predicted upturn.
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Affiliation(s)
- Joseph Falson
- Max Planck Institute for Solid State Research, Stuttgart 70569, Germany
| | - Yong Xu
- State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan
- Frontier Science Center for Quantum Information, Beijing 100084, China
| | - Menghan Liao
- State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
| | - Yunyi Zang
- State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
| | - Kejing Zhu
- State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
| | - Chong Wang
- State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
| | - Zetao Zhang
- State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
| | - Hongchao Liu
- International Center for Quantum Materials, Peking University, Beijing 100871, China
| | - Wenhui Duan
- State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Frontier Science Center for Quantum Information, Beijing 100084, China
- Institute for Advanced Study, Tsinghua University, Beijing 100084, China
| | - Ke He
- State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Frontier Science Center for Quantum Information, Beijing 100084, China
- Beijing Academy of Quantum Information Sciences, Beijing 100193, China
| | - Haiwen Liu
- Center for Advanced Quantum Studies, Department of Physics, Beijing Normal University, Beijing 100875, China
| | - Jurgen H. Smet
- Max Planck Institute for Solid State Research, Stuttgart 70569, Germany
| | - Ding Zhang
- State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Frontier Science Center for Quantum Information, Beijing 100084, China
- Beijing Academy of Quantum Information Sciences, Beijing 100193, China
| | - Qi-Kun Xue
- State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Frontier Science Center for Quantum Information, Beijing 100084, China
- Beijing Academy of Quantum Information Sciences, Beijing 100193, China
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4
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Boeri L, Bachelet GB. Viewpoint: the road to room-temperature conventional superconductivity. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2019; 31:234002. [PMID: 30844781 DOI: 10.1088/1361-648x/ab0db2] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
It is a honor to write a contribution on this memorial for Sandro Massidda. For both of us, at different stages in our lives, Sandro was first and foremost a friend. We both admired his humble, playful and profound approach to life and physics. In this contribution we describe the route which permitted to meet a long-standing challenge in solid state physics, i.e. room temperature superconductivity. In less than 20 years the critical temperature of conventional superconductors, which in the last century had been widely believed to be limited to 25 K, was raised from 40 K in MgB2 to 265 K in LaH10. This discovery was enabled by the development and application of computational methods for superconductors, a field in which Sandro Massidda played a major role.
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Affiliation(s)
- Lilia Boeri
- Dipartimento di Fisica, Sapienza Università di Roma, 00185 Roma, Italy
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5
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Koblischka MR, Naik SPK, Koblischka-Veneva A, Murakami M, Gokhfeld D, Reddy ES, Schmitz GJ. Superconducting YBCO Foams as Trapped Field Magnets. MATERIALS 2019; 12:ma12060853. [PMID: 30871274 PMCID: PMC6471299 DOI: 10.3390/ma12060853] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/14/2019] [Revised: 02/22/2019] [Accepted: 03/05/2019] [Indexed: 11/25/2022]
Abstract
Superconducting foams of YBa2Cu3Oy (YBCO) are proposed as trapped field magnets or supermagnets. The foams with an open-porous structure are light-weight, mechanically strong and can be prepared in large sample sizes. The trapped field distributions were measured using a scanning Hall probe on various sides of an YBCO foam sample after field-cooling in a magnetic field of 0.5 T produced by a square Nd-Fe-B permanent magnet. The maximum trapped field (TF) measured is about 400 G (77 K) at the bottom of the sample. Several details of the TF distribution, the current flow and possible applicatons of such superconducting foam samples in space applications, e.g., as active elements in flux-pinning docking interfaces (FPDI) or as portable strong magnets to collect debris in space, are outlined.
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Affiliation(s)
- Michael R Koblischka
- Superconducting Materials Laboratory, Department of Materials Science and Engineering, Shibaura Institute of Technology, Tokyo 135-8548, Japan.
| | - Sugali Pavan Kumar Naik
- Superconducting Materials Laboratory, Department of Materials Science and Engineering, Shibaura Institute of Technology, Tokyo 135-8548, Japan.
| | - Anjela Koblischka-Veneva
- Superconducting Materials Laboratory, Department of Materials Science and Engineering, Shibaura Institute of Technology, Tokyo 135-8548, Japan.
| | - Masato Murakami
- Superconducting Materials Laboratory, Department of Materials Science and Engineering, Shibaura Institute of Technology, Tokyo 135-8548, Japan.
| | - Denis Gokhfeld
- Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia.
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6
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Onesto V, Villani M, Narducci R, Malara N, Imbrogno A, Allione M, Costa N, Coppedè N, Zappettini A, Cannistraci CV, Cancedda L, Amato F, Di Fabrizio E, Gentile F. Cortical-like mini-columns of neuronal cells on zinc oxide nanowire surfaces. Sci Rep 2019; 9:4021. [PMID: 30858456 PMCID: PMC6411964 DOI: 10.1038/s41598-019-40548-z] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Accepted: 02/18/2019] [Indexed: 11/25/2022] Open
Abstract
A long-standing goal of neuroscience is a theory that explains the formation of the minicolumns in the cerebral cortex. Minicolumns are the elementary computational units of the mature neocortex. Here, we use zinc oxide nanowires with controlled topography as substrates for neural-cell growth. We observe that neuronal cells form networks where the networks characteristics exhibit a high sensitivity to the topography of the nanowires. For certain values of nanowires density and fractal dimension, neuronal networks express small world attributes, with enhanced information flows. We observe that neurons in these networks congregate in superclusters of approximately 200 neurons. We demonstrate that this number is not coincidental: the maximum number of cells in a supercluster is limited by the competition between the binding energy between cells, adhesion to the substrate, and the kinetic energy of the system. Since cortical minicolumns have similar size, similar anatomical and topological characteristics of neuronal superclusters on nanowires surfaces, we conjecture that the formation of cortical minicolumns is likewise guided by the interplay between energy minimization, information optimization and topology. For the first time, we provide a clear account of the mechanisms of formation of the minicolumns in the brain.
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Affiliation(s)
- V Onesto
- Center for Advanced Biomaterials for HealthCare, Istituto Italiano di Tecnologia, 80125, Naples, Italy
- Department of Experimental and Clinical Medicine, University of Magna Graecia, 88100, Catanzaro, Italy
| | - M Villani
- IMEM-CNR Parco Area delle Scienze 37/A, 43124, Parma, Italy
| | - R Narducci
- Istituto Italiano di Tecnologia, Via Morego 30, 16163, Genova, Italy
| | - N Malara
- Department of Experimental and Clinical Medicine, University of Magna Graecia, 88100, Catanzaro, Italy
| | - A Imbrogno
- Tyndall National Institute, Cork, T12 R5CP, Ireland
| | - M Allione
- PSE division, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
| | - N Costa
- Health Department, University of Magna Graecia, 88100, Catanzaro, Italy
| | - N Coppedè
- IMEM-CNR Parco Area delle Scienze 37/A, 43124, Parma, Italy
| | - A Zappettini
- IMEM-CNR Parco Area delle Scienze 37/A, 43124, Parma, Italy
| | - C V Cannistraci
- Biomedical Cybernetics Group, Biotechnology Center (BIOTEC), Center for Molecular and Cellular Bioengineering (CMCB), Center for Systems Biology Dresden (CSBD), Department of Physics, Technische Universität Dresden, Tatzberg 47/49, 01307, Dresden, Germany
- Brain Bio-Inspired Computing (BBC) Lab, IRCCS Centro Neurolesi "Bonino Pulejo", Messina, 98124, Italy
| | - L Cancedda
- Istituto Italiano di Tecnologia, Via Morego 30, 16163, Genova, Italy
- Dulbecco Telethon Institute, Rome, Italy
| | - F Amato
- Department of Electrical Engineering and Information Technology, University Federico II, Naples, Italy
| | - Enzo Di Fabrizio
- PSE division, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
| | - F Gentile
- Department of Electrical Engineering and Information Technology, University Federico II, Naples, Italy.
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7
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Kwok WK, Welp U, Glatz A, Koshelev AE, Kihlstrom KJ, Crabtree GW. Vortices in high-performance high-temperature superconductors. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2016; 79:116501. [PMID: 27652716 DOI: 10.1088/0034-4885/79/11/116501] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The behavior of vortex matter in high-temperature superconductors (HTS) controls the entire electromagnetic response of the material, including its current carrying capacity. Here, we review the basic concepts of vortex pinning and its application to a complex mixed pinning landscape to enhance the critical current and to reduce its anisotropy. We focus on recent scientific advances that have resulted in large enhancements of the in-field critical current in state-of-the-art second generation (2G) YBCO coated conductors and on the prospect of an isotropic, high-critical current superconductor in the iron-based superconductors. Lastly, we discuss an emerging new paradigm of critical current by design-a drive to achieve a quantitative correlation between the observed critical current density and mesoscale mixed pinning landscapes by using realistic input parameters in an innovative and powerful large-scale time dependent Ginzburg-Landau approach to simulating vortex dynamics.
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Affiliation(s)
- Wai-Kwong Kwok
- Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, USA
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8
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Ansermet D, Petrović AP, He S, Chernyshov D, Hoesch M, Salloum D, Gougeon P, Potel M, Boeri L, Andersen OK, Panagopoulos C. Reentrant Phase Coherence in Superconducting Nanowire Composites. ACS NANO 2016; 10:515-523. [PMID: 26727335 DOI: 10.1021/acsnano.5b05450] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The short coherence lengths characteristic of low-dimensional superconductors are associated with usefully high critical fields or temperatures. Unfortunately, such materials are often sensitive to disorder and suffer from phase fluctuations in the superconducting order parameter which diverge with temperature T, magnetic field H, or current I. We propose an approach to overcome synthesis and fluctuation problems: building superconductors from inhomogeneous composites of nanofilaments. Macroscopic crystals of quasi-one-dimensional Na2-δMo6Se6 featuring Na vacancy disorder (δ ≈ 0.2) are shown to behave as percolative networks of superconducting nanowires. Long-range order is established via transverse coupling between individual one-dimensional filaments, yet phase coherence remains unstable to fluctuations and localization in the zero (T,H,I) limit. However, a region of reentrant phase coherence develops upon raising (T,H,I). We attribute this phenomenon to an enhancement of the transverse coupling due to electron delocalization. Our observations of reentrant phase coherence coincide with a peak in the Josephson energy EJ at nonzero (T,H,I), which we estimate using a simple analytical model for a disordered anisotropic superconductor. Na2-δMo6Se6 is therefore a blueprint for a future generation of nanofilamentary superconductors with inbuilt resilience to phase fluctuations at elevated (T,H,I).
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Affiliation(s)
- Diane Ansermet
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University , 637371 Singapore
| | - Alexander P Petrović
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University , 637371 Singapore
| | - Shikun He
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University , 637371 Singapore
| | - Dmitri Chernyshov
- Swiss-Norwegian Beamline, European Synchrotron Radiation Facility , 6 rue Jules Horowitz, Grenoble F-38043 Cedex, France
| | - Moritz Hoesch
- Diamond Light Source , Harwell Campus, Didcot OX11 0DE, Oxfordshire, United Kingdom
| | - Diala Salloum
- Sciences Chimiques, CSM UMR CNRS 6226, Université de Rennes 1 , Avenue du Général Leclerc, Rennes 35042 Cedex, France
- Faculty of Science III, Lebanese University , P.O. Box 826, Kobbeh-Tripoli, Lebanon
| | - Patrick Gougeon
- Sciences Chimiques, CSM UMR CNRS 6226, Université de Rennes 1 , Avenue du Général Leclerc, Rennes 35042 Cedex, France
| | - Michel Potel
- Sciences Chimiques, CSM UMR CNRS 6226, Université de Rennes 1 , Avenue du Général Leclerc, Rennes 35042 Cedex, France
| | - Lilia Boeri
- Institute for Theoretical and Computational Physics, TU Graz , Petersgasse 16, 8010 Graz, Austria
| | - Ole Krogh Andersen
- Max Planck Institute for Solid State Research , Heisenbergstrasse 1, D-70569 Stuttgart, Germany
| | - Christos Panagopoulos
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University , 637371 Singapore
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9
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Huang J, Chen L, Jian J, Tyler K, Li L, Wang H, Wang H. Magnetic (CoFe2O4)0.1(CeO2)0.9 nanocomposite as effective pinning centers in FeSe0.1Te0.9 thin films. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:025702. [PMID: 26654936 DOI: 10.1088/0953-8984/28/2/025702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Magnetic epitaxial (CoFe2O4)0.1(CeO2)0.9 nanocomposite layers were incorporated into superconducting FeSe0.1Te0.9 thin films as either a cap layer or a buffer layer. Both capped and buffered samples show an enhancement of the superconducting property compared to the reference sample without the incorporated layer, while the capped one shows the best pinning properties of all the samples. Specifically for the capped sample, the critical temperature Tc is ~12.5 K, while the self-field critical current density J(c)(sf )increases to as high as 1.20 MA cm(-2) at 4 K. Its J(c)(in-field) value shows a slower decrease with increasing applied magnetic field, with the lowest power-law exponent α values (derived following Jc[formula: see text](μ0H)(-α) by the log(Jc) − log(μ0H) plot) of 0.20, 0.23 and 0.33 at 2 K, 4 K and 8 K, respectively. This nanocomposite capped sample also exhibits a high upper critical field Hc2(0) of 166 T, which indicates its potential in high field applications. This pinning method provides an effective way of enhancing the superconducting property of iron chalcogenide thin film.
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Affiliation(s)
- Jijie Huang
- Department of Material Science and Engineering, Texas A&M University, College Station, TX 77843-3003, USA
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10
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Chen D, Wang X, Chen J, Ren Z, Xue M, Chen G. Rewriting the Superconductivity in Iron-Based Superconductors by Lithium-Ion Insertion and Extraction. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2015; 27:4224-4228. [PMID: 26095502 DOI: 10.1002/adma.201501656] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2015] [Revised: 05/13/2015] [Indexed: 06/04/2023]
Affiliation(s)
- Dong Chen
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - Xusheng Wang
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, PR China
| | - Jitao Chen
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, PR China
| | - Zhian Ren
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing, 100190, China
- Collaborative Innovation Center of Quantum Matter, Beijing, 100190, China
| | - Mianqi Xue
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - Genfu Chen
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing, 100190, China
- Collaborative Innovation Center of Quantum Matter, Beijing, 100190, China
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11
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Xue M, Chen D, Long Y, Wang P, Zhao L, Chen G. Direct Pen Writing of High-Tc, Flexible Magnesium Diboride Superconducting Arrays. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2015; 27:3614-3619. [PMID: 25974155 DOI: 10.1002/adma.201501352] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2015] [Revised: 04/17/2015] [Indexed: 06/04/2023]
Abstract
High-Tc , flexible MgB2 -nanowire-based superconducting arrays are fabricated via a direct pen writing method on both copper foils and poly(dimethylsiloxane) (PDMS) substrates. Such superconducting arrays constitute a new approach for fabricating superconducting devices. The realization of a PDMS-based device demonstrates the potential for expanding this material into other high-Tc superconductor systems, which may lead to novel ways of driving the development of "real-life" applications.
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Affiliation(s)
- Mianqi Xue
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - Dong Chen
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - Yujia Long
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - Peipei Wang
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - Lingxiao Zhao
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - Genfu Chen
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing, 100190, China
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12
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Lin H, Yao C, Zhang X, Dong C, Zhang H, Wang D, Zhang Q, Ma Y, Awaji S, Watanabe K, Tian H, Li J. Hot pressing to enhance the transport Jc of Sr0.6K0.4Fe2As2 superconducting tapes. Sci Rep 2015. [DOI: 10.1038/srep06944 %%changed year, the old is 2014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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13
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Hot pressing to enhance the transport Jc of Sr0.6K0.4Fe2As2 superconducting tapes. Sci Rep 2014; 4:6944. [PMID: 25374068 PMCID: PMC4221786 DOI: 10.1038/srep06944] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2014] [Accepted: 10/20/2014] [Indexed: 12/02/2022] Open
Abstract
High-performance Sr0.6K0.4Fe2As2 (Sr-122) tapes have been successfully fabricated using hot pressing (HP) process. The effect of HP temperatures (850–925°C) on the c-axis texture, resistivity, Vickers micro-hardness, microstructure and critical current properties has been systematically studied. Taking advantage of high degree of c-axis texture, well grain connectivity and large concentration of strong-pinning defects, we are able to obtain an excellent Jc of 1.2 × 105 A/cm2 at 4.2 K and 10 T for Sr-122 tapes. More importantly, the field dependence of Jc turns out to be very weak, such that in 14 T the Jc still remains ~ 1.0 × 105 A/cm2. These Jc values are the highest ever reported so far for iron-pnictide wires and tapes, achieving the level desired for practical applications. Our results clearly strengthen the position of iron-pnictide conductors as a competitor to the conventional and MgB2 superconductors for high field applications.
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14
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Fang L, Jia Y, Mishra V, Chaparro C, Vlasko-Vlasov VK, Koshelev AE, Welp U, Crabtree GW, Zhu S, Zhigadlo ND, Katrych S, Karpinski J, Kwok WK. Huge critical current density and tailored superconducting anisotropy in SmFeAsO₀.₈F₀.₁₅ by low-density columnar-defect incorporation. Nat Commun 2014; 4:2655. [PMID: 24189627 DOI: 10.1038/ncomms3655] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2013] [Accepted: 09/22/2013] [Indexed: 11/09/2022] Open
Abstract
Iron-based superconductors could be useful for electricity distribution and superconducting magnet applications because of their relatively high critical current densities and upper critical fields. SmFeAsO₀.₈F₀.₁₅ is of particular interest as it has the highest transition temperature among these materials. Here we show that by introducing a low density of correlated nano-scale defects into this material by heavy-ion irradiation, we can increase its critical current density to up to 2 × 10⁷ A cm⁻² at 5 K--the highest ever reported for an iron-based superconductor--without reducing its critical temperature of 50 K. We also observe a notable reduction in the thermodynamic superconducting anisotropy, from 8 to 4 upon irradiation. We develop a model based on anisotropic electron scattering that predicts that the superconducting anisotropy can be tailored via correlated defects in semimetallic, fully gapped type II superconductors.
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Affiliation(s)
- L Fang
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
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15
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Abstract
An overview of fundamentals of superconductors under radio-frequency electromagnetic fields in particle accelerators is given, with emphasis on intrinsic physics and materials mechanisms which limit the performance of the superconducting radio-frequency (SRF) resonator cavities. Multiscale mechanisms which control the surface resistance and the quality factor of the SRF cavities at low and high rf fields are discussed. We also discuss possible ways of pushing the limit of the SRF performance by materials impurities and multilayer nanostructuring which may open up opportunities of using materials other than Nb to significantly increase the maximum accelerating fields and improve the performance of the SRF cavities operating at 4.2 K.
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Affiliation(s)
- Alex Gurevich
- Department of Physics and Center for Accelerator Science, Old Dominion University, 4600 Elkhorn Avenue, Norfolk, VA 23529, USA
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Canfield PC. Still alluring and hard to predict at 100. NATURE MATERIALS 2011; 10:259-261. [PMID: 21430665 DOI: 10.1038/nmat2990] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Affiliation(s)
- Paul C Canfield
- Department of Energy's Ames Laboratory, 59 Physics, Iowa State University, Ames, Iowa 50011, USA.
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