The critical current reaction on hydrostatic pressure of a superconductor–semimetal composite

Кононенко, В. В.; Tarenkov, V. Yu.; Dyachenko, Alexander; Varukhin, V. N.

doi:10.1063/1.4915909

Cited by 2 publications

(3 citation statements)

References 35 publications

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“…A characteristic coherence length of triplet correlations ξ F = (D F /2πT) 1/2 can be as large as ~ 100 nm at low temperatures (here D F is the diffusivity of the ferromagnet metal and T is the temperature; we choose h = k B = 1). In previous papers, anomalous superconductivity has been detected in nanocomposites MgB 2 :La 0.67 Sr 0.33 MnO 3 [25] and MgB 2 :La 0.7 Ca 0.3 MnO 3 [10], as well as in half-metallic manganite, (La,Sr)MnO 3 and (La,Ca)MnO 3 , being in contact with an s-wave SC, Pb or MgB 2 [26][27][28]. It was argued that at low-temperatures manganites are thermodynamically very close to a superconducting state with a triplet p-wave even frequency pairing.…”

Section: Composites' Transport Characteristics At T < T Pmentioning

confidence: 91%

“…In this case, percolation effects can be more complicated as far as the electrical coupling between constituent components can be both direct, geometric contact, and indirect one, via spin-dependent proximity effects. Hybrid halfmetallic ferromagnet (hmF)-superconductor (SC) random composite structures can enable new intelligently tailored functionality and have gained attention over the past few years as new functional materials [4,[7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Percolation transitions in d-wave superconductor–half-metallic ferromagnet nanocomposites

Krivoruchko

Tarenkov

2019

Low Temperature Physics

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Electrical transport properties of random binary networks composed of high-T c superconductor Bi 2 Sr 2 Ca 2 Cu 3 O 6+x microparticles and half-metallic ferromagnet La 0.67 Sr 0.33 MnO 3 (LSMO) nanoparticles have been investigated. Two resistive percolation transitions (superconductor-metal-semiconductor) have been observed for the nanocomposites with a volume fraction of the LSMO no more than 30%. The nanocomposites basic attributes (transition critical temperatures, current-voltage characteristics, percolation threshold, etc.), most probably, cannot be quantitatively interpreted within the framework of a conventional percolation model. We have explained the observed behavior by a two-level scale interaction in the system caused by (i) a significant geometric disparity between the constituent components and (ii) proximity-induced superconducting state of the half-metallic manganite.

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Section: Composites' Transport Characteristics At T < T Pmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Percolation transitions in d-wave superconductor–half-metallic ferromagnet nanocomposites

Krivoruchko

Tarenkov

2019

Low Temperature Physics

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“…Moreover, the high critical current density (Jc) at high fields and temperatures is the primary concern for magnesium diboride to substitute lowtemperature superconductors. For example, increasing pressure has a significant superconducting correlation with composite MgB 2 [6]. In most applications, MgB 2 needs to meet some requirements, including high thermal stability, excellent mechanical stability, and inert behavior [7].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of MgB2 superconductors with carbon nanotubes (CNTs) and tin (Sn) addition

et al. 2022

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MgB2/CNT is a promising candidate for superconducting wire application due to its excellent mechanical properties and carbon nanotube’s low density. However, strong interfacial adhesion between the CNT reinforcement and the MgB2 matrix is difficult to manage. Therefore, this study examines the synthesis and characterization of magnesium diboride (MgB2) superconductors with carbon nanotubes (CNTs) and tin (Sn) addition. Determining the proper method and combination of CNT & Sn affects MgB2 superconductors is crucial. Raw materials of magnesium (Mg), boron (B), Sn, and multi-walled carbon nanotubes (MWCNTs) were used for a solid-state reaction process to determine the proper synthesis method and the effect of CNT on superconductors’ critical temperature. Each sample was obtained by weighing the raw material first, followed by hand grinding with agate mortars for 3 hours. The pelletization was then conducted by using a compact pressing machine with a pressure of 350 MPa. The compacted samples were then sintered at 800 °C for 2 hours either through the vacuum or PIST process. Finally, all were characterized, and MgB2 was discovered to be the dominant phase with minor impurity phases such as MgO, Mg, Mg2Sn, C, and Sn. Based on SEM morphological analysis, the grain boundaries of sample A1 were more precise than B2. In both, the grain size also varies, and the distribution of elements is uneven. Subsequently, Cryogenic Magnet Characterization indicated that at 40 K, almost all samples possess superconducting characteristics. For future studies, the potential impact of MgB2 on critical current density (Jc) and magnetic density (Hc) in several commercial applications such as Magnetic Resonance Imaging (MRI), magnetic levitation, and transformers needs to be investigated

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The critical current reaction on hydrostatic pressure of a superconductor–semimetal composite

Cited by 2 publications

References 35 publications

Percolation transitions in d-wave superconductor–half-metallic ferromagnet nanocomposites

Percolation transitions in d-wave superconductor–half-metallic ferromagnet nanocomposites

Synthesis and characterization of MgB2 superconductors with carbon nanotubes (CNTs) and tin (Sn) addition

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