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Rosa G, Lacerda LHD, de Lazaro SR. Structural and Electronic Properties of the Magnetic and Nonmagnetic X 0.125Mg 0.875B 2 (X = Nb, Ni, Fe) Materials: A DFT/HSE06 Approach to Investigate Superconductor Behavior. ACS OMEGA 2024; 9:36802-36811. [PMID: 39220542 PMCID: PMC11359628 DOI: 10.1021/acsomega.4c05894] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 09/04/2024]
Abstract
MgB2 material has a simple composition and structure that is well-reported and characterized. This material has been widely studied and applied in the last 20 years as a superconductor in wire devices and storage material for H in the hydride form. MgB2 doped with transition metals improves the superconductor behavior, such as the critical temperature (T cs) or critical current (J sc) for the superconducting state. The results obtained in this manuscript indicate that Nb-, Fe-, and Ni-doping in the Mg site leads to a contraction of the unit cell through the spin polarization on the electronic resonance of the boron layer. Fe and Ni transition metals doping perturb the electronic resonance because of stronger dopant-boron bonds. The unpaired electrons are transferred from 3d orbitals to the empty 2p z orbitals of the boron atoms, locating α electrons in the σ bonds and β electrons in the π orbitals. The observed influence of magnetic dopants on MgB2 enables the proposal of an electronic mechanism to explain the spin polarization of boron hexagonal rings.
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Chen S, Wang Y, Bai F, Wu X, Wu X, Pakhomova A, Guo J, Huang X, Cui T. Superior Superconducting Properties Realized in Quaternary La-Y-Ce Hydrides at Moderate Pressures. J Am Chem Soc 2024; 146:14105-14113. [PMID: 38717019 DOI: 10.1021/jacs.4c02586] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/23/2024]
Abstract
The recent revolution in the superconductivity field stems from hydride superconductors. Multicomponent hydrides provide a crucial platform for tracking high-temperature superconductors. Besides high superconducting transition temperature (Tc), achieving both giant upper critical magnetic field [μ0Hc2(0)] and high critical current density [Jc(0)] is also key to the latent potential of the application for hydride superconductors. In this work, we have successfully synthesized quaternary La-Y-Ce hydrides with excellent properties under moderate pressure by using the concept of "entropy engineering." The obtained temperature dependence of the resistance provides evidence for the superconductivity of Fm3m-(La,Y,Ce)H10, with the maximum Tc ∼ 190 K (at 112 GPa). Notably, Fm3m-(La,Y,Ce)H10 boasts exceptional properties: μ0Hc2(0) reaching 292 T and Jc(0) surpassing 4.61 × 107 A/cm2. Compared with the binary LaH10/YH10, we find that the Fm3m structure in (La,Y,Ce)H10 can be stable at relatively low pressures (112 GPa). These results indicate that multicomponent hydrides can significantly enhance the superconducting properties and regulate stabilizing pressure through the application of "entropy engineering." This work stimulates the experimental exploration of multihydride superconductors and also provides a reference for the search of room-temperature superconductors in more diversified hydride materials in the future.
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Affiliation(s)
- Su Chen
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
| | - Yulong Wang
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
| | - Fuquan Bai
- Institute of Theoretical Chemistry, College of Chemistry, Jilin University, Changchun 130021, P. R. China
| | - Xinzhao Wu
- Institute of Theoretical Chemistry, College of Chemistry, Jilin University, Changchun 130021, P. R. China
| | - Xinyue Wu
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
| | - Anna Pakhomova
- European Synchrotron Radiation Facility, ESRF, Grenoble 38043, Cedex 9, France
| | - Jianning Guo
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
| | - Xiaoli Huang
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
| | - Tian Cui
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
- School of Physical Science and Technology, Ningbo University, Ningbo 315211, China
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Taseska T, Yu W, Wilsey MK, Cox CP, Meng Z, Ngarnim SS, Müller AM. Analysis of the Scale of Global Human Needs and Opportunities for Sustainable Catalytic Technologies. Top Catal 2023; 66:338-374. [PMID: 37025115 PMCID: PMC10007685 DOI: 10.1007/s11244-023-01799-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/20/2023] [Indexed: 03/13/2023]
Abstract
AbstractWe analyzed the enormous scale of global human needs, their carbon footprint, and how they are connected to energy availability. We established that most challenges related to resource security and sustainability can be solved by providing distributed, affordable, and clean energy. Catalyzed chemical transformations powered by renewable electricity are emerging successor technologies that have the potential to replace fossil fuels without sacrificing the wellbeing of humans. We highlighted the technical, economic, and societal advantages and drawbacks of short- to medium-term decarbonization solutions to gauge their practicability, economic feasibility, and likelihood for widespread acceptance on a global scale. We detailed catalysis solutions that enhance sustainability, along with strategies for catalyst and process development, frontiers, challenges, and limitations, and emphasized the need for planetary stewardship. Electrocatalytic processes enable the production of solar fuels and commodity chemicals that address universal issues of the water, energy and food security nexus, clothing, the building sector, heating and cooling, transportation, information and communication technology, chemicals, consumer goods and services, and healthcare, toward providing global resource security and sustainability and enhancing environmental and social justice.
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Affiliation(s)
- Teona Taseska
- Department of Chemical Engineering, University of Rochester, 14627 Rochester, NY USA
| | - Wanqing Yu
- Department of Chemical Engineering, University of Rochester, 14627 Rochester, NY USA
| | | | - Connor P. Cox
- Materials Science Program, University of Rochester, 14627 Rochester, NY USA
| | - Ziyi Meng
- Materials Science Program, University of Rochester, 14627 Rochester, NY USA
| | - Soraya S. Ngarnim
- Department of Chemistry, University of Rochester, 14627 Rochester, NY USA
| | - Astrid M. Müller
- Department of Chemical Engineering, University of Rochester, 14627 Rochester, NY USA
- Materials Science Program, University of Rochester, 14627 Rochester, NY USA
- Department of Chemistry, University of Rochester, 14627 Rochester, NY USA
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Tidey JP, Liu EP, Lai YC, Chuang YC, Chen WT, Cane LJ, Lester C, Petsch AND, Herlihy A, Simonov A, Hayden SM, Senn M. Pronounced interplay between intrinsic phase-coexistence and octahedral tilt magnitude in hole-doped lanthanum cuprates. Sci Rep 2022; 12:14343. [PMID: 35995852 PMCID: PMC9395519 DOI: 10.1038/s41598-022-18574-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Accepted: 08/16/2022] [Indexed: 11/29/2022] Open
Abstract
Definitive understanding of superconductivity and its interplay with structural symmetry in the hole-doped lanthanum cuprates remains elusive. The suppression of superconductivity around 1/8th doping maintains particular focus, often attributed to charge-density waves (CDWs) ordering in the low-temperature tetragonal (LTT) phase. Central to many investigations into this interplay is the thesis that La1.875Ba0.125CuO4 and particularly La1.675Eu0.2Sr0.125CuO4 present model systems of purely LTT structure at low temperature. However, combining single-crystal and high-resolution powder X-ray diffraction, we find these to exhibit significant, intrinsic coexistence of LTT and low-temperature orthorhombic domains, typically associated with superconductivity, even at 10 K. Our two-phase models reveal substantially greater tilting of CuO6 octahedra in the LTT phase, markedly buckling the CuO2 planes. This would couple significantly to band narrowing, potentially indicating a picture of electronically driven phase segregation, reminiscent of optimally doped manganites. These results call for reassessment of many experiments seeking to elucidate structural and electronic interplay at 1/8 doping.
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Affiliation(s)
- Jeremiah P Tidey
- Department of Chemistry, University of Warwick, Gibbet Hill, Coventry, CV4 7AL, UK
| | - En-Pei Liu
- Department of Physics, Tamkang University, Tamsui, 25137, Taiwan
- Center for Condensed Matter Sciences and Center of Atomic Initiative for New Materials, National Taiwan University, Taipei, 10617, Taiwan
| | - Yen-Chung Lai
- National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan
| | - Yu-Chun Chuang
- National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan
| | - Wei-Tin Chen
- Center for Condensed Matter Sciences and Center of Atomic Initiative for New Materials, National Taiwan University, Taipei, 10617, Taiwan
- Taiwan Consortium of Emergent Crystalline Materials, Ministry of Science and Technology, Taipei, 10622, Taiwan
| | - Lauren J Cane
- H.H. Wills Physics Laboratory, University of Bristol, Bristol, BS8 1TL, UK
| | - Chris Lester
- H.H. Wills Physics Laboratory, University of Bristol, Bristol, BS8 1TL, UK
| | | | - Anna Herlihy
- Department of Chemistry, University of Warwick, Gibbet Hill, Coventry, CV4 7AL, UK
- ISIS Neutron and Muon Facility, Rutherford Appleton Laboratory, Didcot, OX11 0QX, UK
| | - Arkadiy Simonov
- Department of Materials (Multifunctional Ferroic Materials), ETH Zürich, Vladimir-Prelog-Weg-5/10, 8093, Zurich, Switzerland
| | - Stephen M Hayden
- H.H. Wills Physics Laboratory, University of Bristol, Bristol, BS8 1TL, UK
| | - Mark Senn
- Department of Chemistry, University of Warwick, Gibbet Hill, Coventry, CV4 7AL, UK.
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A Mini Review on Thin Film Superconductors. Processes (Basel) 2022. [DOI: 10.3390/pr10061184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Thin superconducting films have been a significant part of superconductivity research for more than six decades. They have had a significant impact on the existing consensus on the microscopic and macroscopic nature of the superconducting state. Thin-film superconductors have properties that are very different and superior to bulk material. Amongst the various classification criteria, thin-film superconductors can be classified into Fe based thin-film superconductors, layered titanium compound thin-film superconductors, intercalation compounds of layered and cage-like structures, and other thin-film superconductors that do not fall into these groups. There are various techniques of manufacturing thin films, which include atomic layer deposition (ALD), chemical vapour deposition (CVD), physical vapour deposition (PVD), molecular beam epitaxy (MBE), sputtering, electron beam evaporation, laser ablation, cathodic arc, and pulsed laser deposition (PLD). Thin film technology offers a lucrative scheme of creating engineered surfaces and opens a wide exploration of prospects to modify material properties for specific applications, such as those that depend on surfaces. This review paper reports on the different types and groups of superconductors, fabrication of thin-film superconductors by MBE, PLD, and ALD, their applications, and various challenges faced by superconductor technologies. Amongst all the thin film manufacturing techniques, more focus is put on the fabrication of thin film superconductors by atomic layer deposition because of the growing popularity the process has gained in the past decade.
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