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Showing 1–9 of 9 results
Advanced filters: Author: Boris Maiorov Clear advanced filters

  • The authors provide experimental evidence that Eu substitution in the spacer layer of Nd1-xEuxNiO2 thin films enhances the superconducting gap, driving the system toward a strong-coupling regime. The Eu substitution also introduces exchange coupling between Eu 4f magnetic moments and Ni 3dx²−y² electrons, leading to magnetic-field-enhanced “re-entrant” superconductivity.

    • Dung Vu
    • Hangoo Lee
    • Charles H. Ahn
    ResearchOpen Access
    Nature Communications
    Volume: 17, P: 1-8

  • Iron-based superconductors are promising for its use in building superconducting magnets; however, their high-field critical current density needs to be improved. Miura et al. show that this can be achieved with a one-step growth process that uniformly incorporates BaZrO3 nanoparticles into BaFe2As2films.

    • Masashi Miura
    • Boris Maiorov
    • Keiichi Tanabe
    ResearchOpen Access
    Nature Communications
    Volume: 4, P: 1-7

  • A very active research area in superconductivity is the performance improvementofthe current carrying capability (Jc). Here, we show that the depairing current (Jd) can beincreased by controlling the penetration depth (λ) and coherence length (ξ) in the two most representative materials: in REBa2Cu3Oy we increased the carrier density to decrease λ and ξ, and in BaFe2(As1-xPx)2 we tuned the chemical pressure. The combination ofthese thermodynamic and flux-pinning optimization routes leads to a dramatic increase of Jc to Jc ~150 MA/cm2 at 4.2 K (32.4% of Jd) for REBa2Cu3Oy, the highest value ever reported for any superconductor.

    • Masashi Miura
    • Go Tsuchiya
    • Boris Maiorov
    ResearchOpen Access
    NPG Asia Materials
    Volume: 14, P: 1-12

  • Magnetic skyrmions are nanosized and topologically-protected objects that exhibit well-controlled motion under applied current making them prime candidates for race-track memories. The author’s study skyrmion lattice creep that is detrimental for memory applications using ultrasound spectroscopy.

    • Yongkang Luo
    • Shi-Zeng Lin
    • Boris Maiorov
    ResearchOpen Access
    Communications Materials
    Volume: 1, P: 1-7

  • Nanostructural modifications, in particular nanoparticle (NP) additions, have been shown to have great success in improving energy-related material performance. We show how an economically viable method, namely metal organic deposition, can be used to obtain tunable small size (7 nm) and high number density NPs (8 × 1022 m−3) while maintaining the crystallinity of the perovskite-composite cuprate superconductor film matrix. Critical current density Jc(H) measurements demonstrate that the NPs are highly effective as pinning centers, decreasing vortex motion and fluctuation effects for all temperatures, magnetic field strengths and orientations measured. Our synthesis method can be applied to other perovskite-composite materials to improve their functionality.

    • Masashi Miura
    • Boris Maiorov
    • Teruo Matsushita
    ResearchOpen Access
    NPG Asia Materials
    Volume: 9, P: e447