1
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Alcalà J, Fernández-Rodríguez A, Günkel T, Barrera A, Cabero M, Gazquez J, Balcells L, Mestres N, Palau A. Tuning the superconducting performance of YBa 2Cu 3O 7-δ films through field-induced oxygen doping. Sci Rep 2024; 14:1939. [PMID: 38253585 PMCID: PMC10803336 DOI: 10.1038/s41598-024-52051-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2023] [Accepted: 01/11/2024] [Indexed: 01/24/2024] Open
Abstract
The exploration of metal-insulator transitions to produce field-induced reversible resistive switching effects has been a longstanding pursuit in materials science. Although the resistive switching effect in strongly correlated oxides is often associated with the creation or annihilation of oxygen vacancies, the underlying mechanisms behind this phenomenon are complex and, in many cases, still not clear. This study focuses on the analysis of the superconducting performance of cuprate YBa2Cu3O7-δ (YBCO) devices switched to different resistive states through gate voltage pulses. The goal is to evaluate the effect of field-induced oxygen diffusion on the magnetic field and angular dependence of the critical current density and identify the role of induced defects in the switching performance. Transition electron microscopy measurements indicate that field-induced transition to high resistance states occurs through the generation of YBa2Cu4O7 (Y124) intergrowths with a large amount of oxygen vacancies, in agreement with the obtained critical current density dependences. These results have significant implications for better understanding the mechanisms of field-induced oxygen doping in cuprate superconductors and their role on the superconducting performance.
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Affiliation(s)
- Jordi Alcalà
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193, Bellaterra, Barcelona, Spain.
| | | | - Thomas Günkel
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193, Bellaterra, Barcelona, Spain
| | - Aleix Barrera
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193, Bellaterra, Barcelona, Spain
| | - Mariona Cabero
- IMDEA Nanoscience Institute, Campus Universidad Autonoma, 28049, Madrid, Spain
- Centro Nacional de Microscopia Electrónica, Universidad Complutense, 28040, Madrid, Spain
| | - Jaume Gazquez
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193, Bellaterra, Barcelona, Spain
| | - Lluis Balcells
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193, Bellaterra, Barcelona, Spain
| | - Narcís Mestres
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193, Bellaterra, Barcelona, Spain
| | - Anna Palau
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193, Bellaterra, Barcelona, Spain.
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2
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Liu G, Shang Y, Jia B, Guan X, Han L, Zhang X, Song H, Lu P. First-principles calculation of the optical properties of the YBa 2Cu 3O 7-δ oxygen vacancies model. RSC Adv 2023; 13:18927-18933. [PMID: 37350856 PMCID: PMC10283493 DOI: 10.1039/d3ra01921g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Accepted: 06/13/2023] [Indexed: 06/24/2023] Open
Abstract
We used first-principles methods to investigate how oxygen vacancy defects affect the optical properties of YBa2Cu3O7-δ (0 < δ < 1), a high-temperature superconductor with potential applications in optical detectors. We calculated the electronic structure of YBa2Cu3O7-δ with different amounts of oxygen vacancies at three different sites: Cu-O chains, CuO2 planes, and apical oxygens. The formation energy calculations support the formation of oxygen vacancies in the Cu-O chain at higher concentrations of vacancy defects, with a preference for alignment in the same chain. The presence of oxygen vacancies affects the optical absorption peak of YBa2Cu3O7-δ in different ways depending on their location and concentration. The optical absorption peaks in the visible range (1.6-3.2 eV) decrease in intensity and shift towards the infrared spectrum as oxygen vacancies increase. We demonstrate that oxygen vacancies can be used as a powerful tool to manipulate the optical response of YBa2Cu3O7-δ to different wavelengths in optical detector devices.
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Affiliation(s)
- Gang Liu
- Beijing Key Laboratory of Space-Ground Interconnection and Convergence, Beijing University of Posts and Telecommunications Beijing 100876 China
- School of Electronic Engineering, Beijing University of Posts and Telecommunications Beijing 100876 China
| | - Yuanhang Shang
- School of Electronic Engineering, Beijing University of Posts and Telecommunications Beijing 100876 China
- State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications Beijing 100876 China
| | - Baonan Jia
- State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications Beijing 100876 China
| | - Xiaoning Guan
- State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications Beijing 100876 China
| | - Lihong Han
- State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications Beijing 100876 China
| | - Xinhui Zhang
- School of Science, Xi'an University of Architecture and Technology Xi'an 710055 Shaanxi China
| | - Haizhi Song
- Southwest Institute of Technical Physics Chengdu 610041 China
| | - Pengfei Lu
- State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications Beijing 100876 China
- School of Integrated Circuits, Beijing University of Posts and Telecommunications Beijing 100876 China
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3
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Cayado P, Grünewald L, Erbe M, Hänisch J, Gerthsen D, Holzapfel B. Critical current density improvement in CSD-grown high-entropy REBa 2Cu 3O 7-δ films. RSC Adv 2022; 12:28831-28842. [PMID: 36320519 PMCID: PMC9552191 DOI: 10.1039/d2ra03807b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Accepted: 09/16/2022] [Indexed: 12/05/2022] Open
Abstract
High-entropy oxide (HEO) superconductors have been developed since very recently. Different superconductors can be produced in the form of a high-entropy compound, including REBa2Cu3O7-δ (REBCO). However, until now, mainly bulk samples (mostly in polycrystalline form) have been reported. In this work, the first CSD-grown high-entropy (HE) REBCO nanocomposite films were successfully synthesized. In particular, high-quality Gd0.2Dy0.2Y0.2Ho0.2Er0.2Ba2Cu3O7-δ nanocomposite films with 12 mol% BaHfO3 nanoparticles were grown on SrTiO3 substrates. The X-ray diffraction patterns show a near-perfect c-axis oriented grain growth. Both T c and 77 K J sf c, 91.9 K and 3.5 MA cm-2, respectively, are comparable with the values of the single-RE REBCO films. Moreover, at low temperatures, specifically at 30 K, the J c values are larger than those of the single-RE samples. A transmission electron microscopy (TEM) study, including energy-dispersive X-ray spectroscopy (EDXS) measurements, reveals that the different RE3+ ions are distributed homogeneously in the matrix without forming clusters. This distribution causes point-like pinning centres that explain the superior performances of these samples at low temperatures. Although still seen as a proof-of-concept for the feasibility of preparing such films, these results demonstrate that the HE REBCO films are a promising option for the future fabrication of high-performance coated conductors. In the investigated B-T range, however, their J c values are still lower than those of other, medium-entropy REBCO films, which shows that an optimization of the composition of the HE REBCO films is needed to maximize their performance.
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Affiliation(s)
- Pablo Cayado
- Karlsruhe Institute of Technology (KIT), Institute for Technical Physics (ITEP)Hermann-von-Helmholtz-Platz 176344 Eggenstein-LeopoldshafenGermany,University of Geneva, Department of Quantum Matter Physics (DQMP)Quai Ernest-Ansermet 241211 GenevaSwitzerland
| | - Lukas Grünewald
- Karlsruhe Institute of Technology (KIT), Laboratory for Electron Microscopy (LEM)Engesserstr. 776131 KarlsruheGermany
| | - Manuela Erbe
- Karlsruhe Institute of Technology (KIT), Institute for Technical Physics (ITEP)Hermann-von-Helmholtz-Platz 176344 Eggenstein-LeopoldshafenGermany
| | - Jens Hänisch
- Karlsruhe Institute of Technology (KIT), Institute for Technical Physics (ITEP)Hermann-von-Helmholtz-Platz 176344 Eggenstein-LeopoldshafenGermany
| | - Dagmar Gerthsen
- Karlsruhe Institute of Technology (KIT), Laboratory for Electron Microscopy (LEM)Engesserstr. 776131 KarlsruheGermany
| | - Bernhard Holzapfel
- Karlsruhe Institute of Technology (KIT), Institute for Technical Physics (ITEP)Hermann-von-Helmholtz-Platz 176344 Eggenstein-LeopoldshafenGermany
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4
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Zhang J, Wang W, Wang N, Wang M, Qi Y. Atomic-resolution study on the interface structure and strain state reversion of the Bi2Sr2CuO6+δ/MgO heterostructure. J Colloid Interface Sci 2021; 592:291-295. [DOI: 10.1016/j.jcis.2021.02.063] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Revised: 02/06/2021] [Accepted: 02/14/2021] [Indexed: 11/26/2022]
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5
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Abstract
Chemical solution deposition of Gd-doped YBCO, Y1GdyBa2Cu3O7−δ, (YBCO-Gd), film was carried out following the metal-organic decomposition approach and in situ route. Two dopant concentrations, 5 and 10 mol %, were evaluated. The morphology and crystalline structure of the superconductor films were deeply investigated. In general, a homogeneous and well c-axis oriented film was observed by using scanning and transmission electron microscopy (SEM and TEM) and X-ray diffraction. However, compared to pure YBCO, YBCO-Gd samples showed an increased stacking faults concentration, as recognized by TEM. X-ray photoelectron spectroscopy allowed studying the Gd distribution in the films and gathered information about the Gd electronic environment. Superconducting properties were evaluated at different temperatures, magnetic field directions, and intensities. Higher zero-field critical current densities were measured with respect to undoped samples in the temperature range from 10 to 77 K with both Gd concentrations (i.e., 28, 27, and 13 MA·cm−2, respectively, for YBCO-Gd 5%, YBCO-Gd 10%, and undoped YBCO at 10 K in self field condition). At low temperatures, this improvement was maintained up to 12 T, confirming the efficacy of Gd addition for the enhancement of transport properties of YBCO film.
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6
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Li Z, Coll M, Mundet B, Palau A, Puig T, Obradors X. Suppression of superconductivity at the nanoscale in chemical solution derived YBa 2Cu 3O 7-δ thin films with defective Y 2Ba 4Cu 8O 16 intergrowths. NANOSCALE ADVANCES 2020; 2:3384-3393. [PMID: 36134255 PMCID: PMC9418937 DOI: 10.1039/d0na00456a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Accepted: 06/23/2020] [Indexed: 06/13/2023]
Abstract
The analysis of the microstructure and superconducting behavior of chemical solution deposited epitaxial YBa2Cu3O7-δ films, with thickness going down to 5 nm has been carried out with the purpose to disclose the behavior of the most common intergrowth in these films, the Y2Ba4Cu8O16. The analysis of ultrathin films is a unique opportunity to investigate the superconducting behavior of these nanoscale defects because of the high concentration created as a consequence of the elastic energy associated to the misfit strain. Magnetic susceptibility and X-ray diffraction measurements evidence a strong decrease of the superconducting volume correlated with an increase of the intergrowth volume fraction. We demonstrate that these intergrowths are non-superconducting nanoscale regions where Cooper pair formation is disrupted, in agreement with their key role as artificial pinning centers for vortices in YBa2Cu3O7-δ films and coated conductors.
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Affiliation(s)
- Ziliang Li
- Institut de Ciència de Materials de Barcelona, CSIC, Campus de la UAB 08193 Bellaterra Catalonia Spain
| | - Mariona Coll
- Institut de Ciència de Materials de Barcelona, CSIC, Campus de la UAB 08193 Bellaterra Catalonia Spain
| | - Bernat Mundet
- Institut de Ciència de Materials de Barcelona, CSIC, Campus de la UAB 08193 Bellaterra Catalonia Spain
| | - Anna Palau
- Institut de Ciència de Materials de Barcelona, CSIC, Campus de la UAB 08193 Bellaterra Catalonia Spain
| | - Teresa Puig
- Institut de Ciència de Materials de Barcelona, CSIC, Campus de la UAB 08193 Bellaterra Catalonia Spain
| | - Xavier Obradors
- Institut de Ciència de Materials de Barcelona, CSIC, Campus de la UAB 08193 Bellaterra Catalonia Spain
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7
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Mundet B, Hartman ST, Guzman R, Idrobo JC, Obradors X, Puig T, Mishra R, Gázquez J. Local strain-driven migration of oxygen vacancies to apical sites in YBa 2Cu 3O 7-x. NANOSCALE 2020; 12:5922-5931. [PMID: 32108218 DOI: 10.1039/d0nr00666a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
It is well known that in the high-temperature superconductor YBa2Cu3O7-x (YBCO), oxygen vacancies (VO) control the carrier concentration, its critical current density and transition temperature. In this work, it is revealed that VO also allows the accommodation of local strain fields caused by large-scale defects within the crystal. We show that the nanoscale strain associated with Y2Ba4Cu8O16 (Y124) intergrowths-that are common defects in YBCO-strongly affect the venue and concentration of VO. Local probe measurements in conjunction with density-functional-theory calculations indicate a strain-driven reordering of VO from the commonly observed CuO chains towards the bridging apical sites located in the BaO plane and bind directly to the superconducting CuO2 planes. Our findings have strong implications on the physical properties of the YBCO, as the presence of apical VO alters the transfer of carriers to the CuO2 planes, confirmed by changes in the Cu and O core-loss edge probed using electron energy loss spectroscopy, and creates structural changes that affect the Cu-O bonds in the superconducting planes. In addition, the revelation of apical VO also has implications on modulating critical current densities and enhancing vortex pinning.
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Affiliation(s)
- Bernat Mundet
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, Bellaterra, 08193 Barcelona, Spain.
| | - Steven T Hartman
- Institute of Materials Science and Engineering, Washington University in St Louis, St Louis, Missouri 63130, USA
| | - Roger Guzman
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, Bellaterra, 08193 Barcelona, Spain.
| | - Juan C Idrobo
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Xavier Obradors
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, Bellaterra, 08193 Barcelona, Spain.
| | - Teresa Puig
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, Bellaterra, 08193 Barcelona, Spain.
| | - Rohan Mishra
- Department of Mechanical Engineering and Materials Science, Washington University in St Louis, St Louis, Missouri 63130, USA.
| | - Jaume Gázquez
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, Bellaterra, 08193 Barcelona, Spain.
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8
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Murray PD, Gilbert DA, Grutter AJ, Kirby BJ, Hernández-Maldonado D, Varela M, Brubaker ZE, Liyanage WLNC, Chopdekar RV, Taufour V, Zieve RJ, Jeffries JR, Arenholz E, Takamura Y, Borchers JA, Liu K. Interfacial-Redox-Induced Tuning of Superconductivity in YBa 2Cu 3O 7-δ. ACS APPLIED MATERIALS & INTERFACES 2020; 12:4741-4748. [PMID: 31880904 DOI: 10.1021/acsami.9b18820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Solid-state ionic approaches for modifying ion distributions in getter/oxide heterostructures offer exciting potentials to control material properties. Here, we report a simple, scalable approach allowing for manipulation of the superconducting transition in optimally doped YBa2Cu3O7-δ (YBCO) films via a chemically driven ionic migration mechanism. Using a thin Gd capping layer of up to 20 nm deposited onto 100 nm thick epitaxial YBCO films, oxygen is found to leach from deep within the YBCO. Progressive reduction of the superconducting transition is observed, with complete suppression possible for a sufficiently thick Gd layer. These effects arise from the combined impact of redox-driven electron doping and modification of the YBCO microstructure due to oxygen migration and depletion. This work demonstrates an effective step toward total ionic tuning of superconductivity in oxides, an interface-induced effect that goes well into the quasi-bulk regime, opening-up possibilities for electric field manipulation.
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Affiliation(s)
| | - Dustin A Gilbert
- NIST Center for Neutron Research , National Institute of Standards and Technology , Gaithersburg , Maryland 20899 , United States
- Department of Materials Science and Engineering , University of Tennessee , Knoxville , Tennessee 37996 , United States
| | - Alexander J Grutter
- NIST Center for Neutron Research , National Institute of Standards and Technology , Gaithersburg , Maryland 20899 , United States
| | - Brian J Kirby
- NIST Center for Neutron Research , National Institute of Standards and Technology , Gaithersburg , Maryland 20899 , United States
| | - David Hernández-Maldonado
- Dept. de Física de Materiales & Instituto Pluridisciplinar , Universidad Complutense de Madrid , Madrid 28040 , Spain
| | - Maria Varela
- Dept. de Física de Materiales & Instituto Pluridisciplinar , Universidad Complutense de Madrid , Madrid 28040 , Spain
| | - Zachary E Brubaker
- ∇Materials Science Division and ○Physics Division , Lawrence Livermore National Laboratory , Livermore , California 94550 , United States
| | - W L N C Liyanage
- Department of Materials Science and Engineering , University of Tennessee , Knoxville , Tennessee 37996 , United States
| | - Rajesh V Chopdekar
- Advanced Light Source , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States
| | | | | | | | - Elke Arenholz
- Advanced Light Source , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States
| | | | - Julie A Borchers
- NIST Center for Neutron Research , National Institute of Standards and Technology , Gaithersburg , Maryland 20899 , United States
| | - Kai Liu
- Physics Department , Georgetown University , Washington, D.C. 20057 , United States
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9
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Ivanov YP, Soltan S, Albrecht J, Goering E, Schütz G, Zhang Z, Chuvilin A. The Route to Supercurrent Transparent Ferromagnetic Barriers in Superconducting Matrix. ACS NANO 2019; 13:5655-5661. [PMID: 30977633 PMCID: PMC8830211 DOI: 10.1021/acsnano.9b00888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Accepted: 04/12/2019] [Indexed: 06/09/2023]
Abstract
A ferromagnetic barrier thinner than the coherence length in high-temperature superconductors is realized in the multilayers of YBa2Cu3O7-δ and La0.67Ca0.33MnO3. We used epitaxial growth of YBCO on ⟨110⟩ SrTiO3 substrates by pulsed laser deposition to prepare thin superconducting films with copper oxide planes oriented at an angle to the substrate surface. Subsequent deposition of LCMO and finally a second YBCO layer produces a superconductor/ferromagnet/superconductor trilayer containing an ultrathin ferromagnetic barrier with sophisticated geometry at which the long axis of coherence length ovoid of YBCO is pointing across the LCMO ferromagnetic layer. A detailed characterization of this structure is achieved using high-resolution electron microscopy.
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Affiliation(s)
- Yurii P. Ivanov
- Department
of Materials Science and Metallurgy, University
of Cambridge, Cambridge CB3 0FS, United Kingdom
- Erich
Schmid Institute of Materials Science, Austrian
Academy of Sciences, Jahnstraße 12, A-8700 Leoben, Austria
- School
of Natural Sciences, Far Eastern Federal
University, 690950 Vladivostok, Russia
| | - Soltan Soltan
- Department
of Physics, Faculty of Science, Helwan University, 11792 Cairo, Egypt
- Max-Planck-Institute
for Intelligent Systems, Heisenbergstr. 3, D-70569 Stuttgart, Germany
| | - Joachim Albrecht
- Research
Institute for Innovative Surfaces FINO, Beethovenstr. 1, D-73430 Aalen, Germany
| | - Eberhard Goering
- Max-Planck-Institute
for Intelligent Systems, Heisenbergstr. 3, D-70569 Stuttgart, Germany
| | - Gisela Schütz
- Max-Planck-Institute
for Intelligent Systems, Heisenbergstr. 3, D-70569 Stuttgart, Germany
| | - Zaoli Zhang
- Erich
Schmid Institute of Materials Science, Austrian
Academy of Sciences, Jahnstraße 12, A-8700 Leoben, Austria
| | - Andrey Chuvilin
- CIC
nanoGUNE Consolider, Av. de Tolosa 76, 20018 San Sebastian, Spain
- Basque
Foundation for Science, IKERBASQUE, Maria Diaz de Haro 3, 48013 Bilbao, Spain
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10
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Control of nanostructure and pinning properties in solution deposited YBa 2Cu 3O 7-x nanocomposites with preformed perovskite nanoparticles. Sci Rep 2019; 9:5828. [PMID: 30967568 PMCID: PMC6456625 DOI: 10.1038/s41598-019-42291-x] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Accepted: 03/22/2019] [Indexed: 11/08/2022] Open
Abstract
Solution deposited YBa2Cu3O7−x (YBCO) nanocomposites with preformed nanoparticles represent a promising cost-effective approach for superior critical current properties under applied magnetic fields. Nonetheless, the majority of YBCO nanocomposites with high nanoparticle loads (>20%) suffer from nanoparticle coalescence and degraded superconducting properties. Here, we study the influence of nanoparticle concentration (0–25% mol), size (5 nm–10 nm) and composition (BaHfO3, BaZrO3) on the generation of structural defects in the epitaxial YBCO matrix, key parameter for vortex pinning. We demonstrate that flash-heated superconducting nanocomposites with 20 mol% preformed BaHfO3 or BaZrO3 perovskite secondary phases feature discrete and small (7 nm) nanoparticles and high density of YBa2Cu4O8 (Y248) intergrowths. We identify a synergy between Y248 intergrowth density and small nanoparticles to increase artificial vortex pinning centers. Also, we validate the multideposition process to successfully increase film thickness of epitaxial nanocomposites with competitive critical currents Ic at 77 K.
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11
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Thind AS, Luo G, Hachtel JA, Morrell MV, Cho SB, Borisevich AY, Idrobo JC, Xing Y, Mishra R. Atomic Structure and Electrical Activity of Grain Boundaries and Ruddlesden-Popper Faults in Cesium Lead Bromide Perovskite. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1805047. [PMID: 30506822 DOI: 10.1002/adma.201805047] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Revised: 11/05/2018] [Indexed: 06/09/2023]
Abstract
To evaluate the role of planar defects in lead-halide perovskites-cheap, versatile semiconducting materials-it is critical to examine their structure, including defects, at the atomic scale and develop a detailed understanding of their impact on electronic properties. In this study, postsynthesis nanocrystal fusion, aberration-corrected scanning transmission electron microscopy, and first-principles calculations are combined to study the nature of different planar defects formed in CsPbBr3 nanocrystals. Two types of prevalent planar defects from atomic resolution imaging are observed: previously unreported Br-rich [001](210)∑5 grain boundaries (GBs) and Ruddlesden-Popper (RP) planar faults. The first-principles calculations reveal that neither of these planar faults induce deep defect levels, but their Br-deficient counterparts do. It is found that the ∑5 GB repels electrons and attracts holes, similar to an n-p-n junction, and the RP planar defects repel both electrons and holes, similar to a semiconductor-insulator-semiconductor junction. Finally, the potential applications of these findings and their implications to understand the planar defects in organic-inorganic lead-halide perovskites that have led to solar cells with extremely high photoconversion efficiencies are discussed.
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Affiliation(s)
- Arashdeep Singh Thind
- Institute of Materials Science & Engineering, Washington University in St. Louis, St. Louis, MO, 63130, USA
| | - Guangfu Luo
- Department of Mechanical Engineering & Materials Science, Washington University in St. Louis, St. Louis, MO, 63130, USA
| | - Jordan A Hachtel
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Maria V Morrell
- Department of Chemical Engineering, University of Missouri, Columbia, MO, 65211, USA
| | - Sung Beom Cho
- Department of Mechanical Engineering & Materials Science, Washington University in St. Louis, St. Louis, MO, 63130, USA
| | - Albina Y Borisevich
- Material Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Juan-Carlos Idrobo
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Yangchuan Xing
- Department of Chemical Engineering, University of Missouri, Columbia, MO, 65211, USA
| | - Rohan Mishra
- Institute of Materials Science & Engineering, Washington University in St. Louis, St. Louis, MO, 63130, USA
- Department of Mechanical Engineering & Materials Science, Washington University in St. Louis, St. Louis, MO, 63130, USA
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12
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Santana JA, Mishra R, Krogel JT, Borisevich AY, Kent PRC, Pantelides ST, Reboredo FA. Quantum Many-Body Effects in Defective Transition-Metal-Oxide Superlattices. J Chem Theory Comput 2017; 13:5604-5609. [DOI: 10.1021/acs.jctc.7b00483] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Juan A. Santana
- Department
of Chemistry, University of Puerto Rico at Cayey, P.O. Box 372230, Cayey, Puerto Rico 00737-2230, United States
| | - Rohan Mishra
- Department
of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, United States
- Department
of Mechanical Engineering and Materials Science and the Institute
of Materials Science and Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, United States
| | | | | | | | - Sokrates T. Pantelides
- Department
of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, United States
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13
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Competition between Superconductor - Ferromagnetic stray magnetic fields in YBa 2Cu 3O 7-x films pierced with Co nano-rods. Sci Rep 2017; 7:5663. [PMID: 28720833 PMCID: PMC5516025 DOI: 10.1038/s41598-017-05909-6] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Accepted: 06/05/2017] [Indexed: 11/09/2022] Open
Abstract
Superconductivity and ferromagnetism are two antagonistic phenomena that combined can lead to a rich phenomenology of interactions, resulting in novel physical properties and unique functionalities. Here we propose an original hybrid system formed by a high-temperature superconducting film, patterned with antidots, and with ferromagnetic nano-rods grown inside them. This particular structure exhibits the synergic influence of superconductor (SC) - ferromagnetic (FM) stray fields, in both the superconducting behaviour of the film and the three-dimensional (3D) magnetic structure of nano-rods. We show that FM stray fields directly influence the critical current density of the superconducting film. Additional functionalities appear due to the interaction of SC stray fields, associated to supercurrent loops, with the non-trivial 3D remanent magnetic structure of FM nano-rods. This work unravels the importance of addressing quantitatively the effect of stray magnetic fields from both, the superconductor and the ferromagnet in hybrid magnetic nano-devices based on high temperature superconductors.
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Wu J, Lauter V, Ambaye H, He X, Božović I. Search for ferromagnetic order in overdoped copper-oxide superconductors. Sci Rep 2017; 7:45896. [PMID: 28378795 PMCID: PMC5381091 DOI: 10.1038/srep45896] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2016] [Accepted: 03/03/2017] [Indexed: 11/16/2022] Open
Abstract
In copper-oxides that show high-temperature superconductivity (HTS), the critical temperature (Tc) has a dome-shaped doping dependence. The cause of demise of both Tc and superfluid density ns on the overdoped side is a major puzzle. A recent study of transport and diamagnetism in a large number of overdoped La2−xSrxCuO4 (LSCO) films shows that this cannot be accounted for by disorder within the conventional Bardeen-Cooper-Schrieffer theory. This brings to focus an alternative explanation — competition of HTS with ferromagnetic order, fluctuating in superconducting samples and static beyond the superconductor-to-metal transition. Here, we examine this proposal by growing single-crystal LSCO thin films with doping on both sides of the transition by molecular beam epitaxy, and using polarized neutron reflectometry to measure their magnetic moments. In a heavily overdoped, metallic but non-superconducting LSCO (x = 0.35) film, the spin asymmetry of reflectivity shows a very small static magnetic moment (~2 emu/cm3). Less-doped, superconducting LSCO films show no magnetic moment in neutron reflectivity, both above and below Tc. Therefore, the collapse of HTS with overdoping is not caused by competing ferromagnetic order.
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Affiliation(s)
- J Wu
- Brookhaven National Laboratory, Upton, NY 11973, USA
| | - V Lauter
- Quantum Condensed Matter Division, Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - H Ambaye
- Instrument and Source Division, Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - X He
- Applied Physics Department, Yale University, New Haven, CT 06520, USA
| | - I Božović
- Brookhaven National Laboratory, Upton, NY 11973, USA.,Applied Physics Department, Yale University, New Haven, CT 06520, USA
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