Proximity effect controlled superconducting behavior of novel biphasic Pb–Sn nanoparticles embedded in an Al matrix

Bose, Sangita; Bhattacharya, Victoria; Chattopadhyay, K.; Ayyub, Pushan

doi:10.1016/j.actamat.2008.05.018

Cited by 15 publications

(17 citation statements)

References 28 publications

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“…In these systems, disorder could be tuned by changing the relative content of the two (N and S) but the normal state always remained a good metal. Studies on Pb-Cu, Pb-Ag granular films showed that the Tc varied with the relative content of the two constituents [16,17,18]. In these films, the grain sizes were lower than the respective coherence lengths, and it was observed that the Tc followed a similar variation as predicted (and observed) for bilayers and multilayers [19,20], if the thickness of the two was replaced by the volume fractions of the two.…”

Section: Introductionmentioning

confidence: 63%

Superconductivity in immiscible Nb–Cu nanocomposite films

Parab

Bagwe

Chalke

et al. 2017

Supercond. Sci. Technol.

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Superconductivity in granular films is controlled by the grain size and the intergrain coupling. In a two-component granular system formed by a random mixture of a normal metal (N) and a superconductor (S), the superconducting nano-grains may become coupled through S-N weak links, thereby affecting the superconducting properties of the network. We report on the study of superconductivity in immiscible Nb-Cu nanocomposite films with varying compositions. The microstructure of the films revealed the presence of phase separated, closely spaced, nano-grains of Nb and Cu whose sizes changed marginally with composition. The superconducting transition temperature (Tc0) of the films decreased with increasing concentration of Cu with a concomitant decrease in the upper critical field (Hc2) and the critical current (Ic). Our results indicate the presence of superconducting phasefluctuations in all films with varying Nb:Cu content which not only affected the temperature for the formation of a true phase coherent superconducting condensate in the films but also other superconducting properties.

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Section: Introductionmentioning

confidence: 63%

Superconductivity in immiscible Nb–Cu nanocomposite films

Parab

Bagwe

Chalke

et al. 2017

Supercond. Sci. Technol.

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“…Figure 7 is an illustration of a PbSn particle embedded in an Al matrix. 23 The contrast seen in the bright field image shown in Figure 7a cannot be unambiguously attributed to chemistry using this image. Figure 7c-f is maps using specific peaks in the spectrum, clearly showing that the contrast in the bright field image is indeed due to differences in chemistry.…”

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confidence: 85%

“…XEDS maps in the scanning (STEM) mode or energy-filtered images that are created using specific energy windows characterisitic of specific elements are examples of such maps. Figure is an illustration of a PbSn particle embedded in an Al matrix . The contrast seen in the bright field image shown in Figure a cannot be unambiguously attributed to chemistry using this image.…”

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confidence: 99%

Seeing is Believing: Electron Microscopy for Investigating Nanostructures

Ravishankar

2010

J. Phys. Chem. Lett.

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Controlling the properties of nanostructures requires a detailed understanding of structure, microstructure, and chemistry at ever-decreasing length scales. The modern day transmission electron microscope has thus become an indispensable tool in the study of nanostructures. In this Perspective, we present a brief account of the capabilities of the TEM with some typical examples for characterizing nanostructures. The modern-day TEM has moved from a simple characterization tool to a nanoscale laboratory enabling in situ observation of several fundamental processes at unprecedented resolution levels.

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“…Alloys consisting of mutually immiscible metals and those that have limited miscibility in equilibrium conditions are promising materials for a range of engineering applications, thanks to their unique combination of mechanical, electrical and physical properties [1][2][3]. In regards to some of their physico-mechanical and operational properties, such materials may be superior to traditional alloys of similar purpose.…”

Section: Introductionmentioning

confidence: 99%

The formation of Fe Cu composite based on bimetallic nanoparticles

Ложкомоев

Лернер

Первиков

et al. 2019

Vacuum

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In this paper we suggest a new method of producing a Fe-28 wt% Cu composite by compacting and subsequent sintering of bimetallic nanoparticles made of metals with limited mutual miscibility: iron and copper. The influence of the temperature of annealing on the structure and phase composition of consolidated composite samples has been analyzed. It has been shown that annealing in the temperature range of 200-400 °C induces the processes of low-temperature sintering of copper and iron. These processes are accompanied by the growth of the size of coherent scattering regions and the separation of the metallic components of nanoparticles. During thermal treatment in the range between 400 and 600 °C, adjacent sidewalls of large particles are welded together and large pores emerge in the sample. Further temperature increases cause the sample to shrink and the pores to become smaller. The consolidation of bimetallic nanoparticles consisting of iron and copper and their subsequent sintering allows for obtaining volumetric composites that have homogeneous structure without distinct macroscopic separation of phases as well as high strength characteristics.

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Proximity effect controlled superconducting behavior of novel biphasic Pb–Sn nanoparticles embedded in an Al matrix

Cited by 15 publications

References 28 publications

Superconductivity in immiscible Nb–Cu nanocomposite films

Superconductivity in immiscible Nb–Cu nanocomposite films

Seeing is Believing: Electron Microscopy for Investigating Nanostructures

The formation of Fe Cu composite based on bimetallic nanoparticles

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