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ISSN: 2772-8307
Copyright © 2026 Shanghai Jiaotong University. Published by Elsevier B.V. All rights are reserved, including those for text and data mining, AI training, and similar technologies.
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CEPC vs FCC: Detector magnet designs for future circular electron-positron colliders
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Article Number:Article 100260
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Design, simulation, and experimental validation of a heat treatment system for CRAFT TF Nb3Sn coil: A critical step towards CFETR TF
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Article Number:Article 100259
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Coupling loss model for multifilamentary coated conductor tapes valid in wide range of frequencies
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Article Number:Article 100258
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Abstract
Corresponding email:ajcosta@lnec.pt
This editorial provides views and guidelines on the development and operation of horizontal axis radial levitation passive magnetic bearings (PMB) with High-temperature Superconducting (HTS) bulks using Zero-Field cooling (ZFC) in the stator and permanent magnet (PM) rings in the rotor. These are based on results from a framework on the conception, study, optimization, implementation and experimental testing of proof-of-concept prototypes. Views and guidelines are given on: i) Methodologies to facilitate the initial Zero-field cooling ZFC magnetization process; ii) Topologies of HTS bulks for which levitation is verified with alignment of the rotor and stator axes; iii) PM rotor sizing to create guiding stability; iv) Addition of external limiting PM rings to significantly increase guidance forces and stiffness; and v) Scale-up principles to consider on the design of bearings to support higher weight rotors.
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Epitaxial compressive strain effect in La3Ni2O7-δ thin films
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Article Number:Article 100252
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Abstract
Corresponding email:liang.qiao@uestc.edu.cn
Epitaxial strain provides an effective route to tune the structural and electronic properties of correlated oxide thin films. Here, to investigate the influence of in-plane compressive strain effect on La3Ni2O7-δ thin films, we synthesize a series of samples on three compressively strained substrates. We observe that the resistance exhibits a metal-to-insulator transition behavior as the strain level increases. This is attributed to the aggravated oxygen deficiency in large compressive strain cases. Our theoretical calculations confirm that the formation energy of oxygen vacancies gradually decreases with the increase of in-plane compressive strain strengths, suggesting more serious oxygen content deviation. Furthermore, we also reveal that the γ band, dominated by Ni 3dz2 orbitals, exhibits a dependent relationship with the compressive strain, which is gradually moving away from the Fermi energy as the strain increases. These results establish a correlation between epitaxial strain, oxygen vacancy formation, and electronic transport in La3Ni2O7-δ thin films. Our work provides important insights into the compressive strain, oxygen defect, and electronic structure interplay in bilayer nickelates, which is essential for understanding and tuning their emergent physical properties.
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Characterising irradiation damage in REBCO coated conductor using multiple absorption edge polarisation dependent EXAFS
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Article Number:Article 100253
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Abstract
Corresponding email:jarrod.lewis1@diamond.ac.uk
Understanding how irradiation degrades superconductivity in REBCO coated conductor is a pressing field of research for the development of compact fusion devices. Here, defect formation in GdBa2Cu3O coated conductor is studied using a high dose of 2 MeV He ion irradiation. While laboratory based X-ray diffraction and magnetometry measurements show that the crystal structure becomes less well ordered with the loss of superconductivity in the material, transmission electron microscopy reveals a complex landscape of structural defects within the as-manufactured tape which complicate the identification and characterisation of irradiation induced structural changes. To resolve this, three sets of polarisation dependent extended X-ray absorption fine structure (EXAFS) spectroscopy experiments were carried out to map the local structure of the Gd, Ba, and Cu atomic sites within the material, providing three independent probes for studying irradiation defects within the structurally anisotropic REBCO unit cell. Here the Ba and Cu environments were the more sensitive to the irradiation treatment, with only small changes to the Gd local structure observed. Both the Ba and Cu local structures retained much of the pristine structure in the a/b-plane following irradiation, with greater shifts evident in the c-axis aligned measurements. In the irradiated Cu K edge EXAFS analysis, a shifted peak in the c-axis aligned measurements is observed that is not compatible with the REBCO local structure. This is attributed to an O site irradiation defect motif consistent with a Frenkel defect.
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