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Published on: August 2, 2019
9.7K
Reversibility in superconducting granular NiBi3embedded in a Bi matrix.
L Y Liu1, Y T Xing2, V N Vieira3
1Centro Brasileiro de Pesquisas Físicas, Rio de Janeiro 22290-180, Brazil.
Summary
This study demonstrates superconducting reversibility in NiBi3 grains within a bismuth matrix. Increasing nickel content enhances NiBi3 grain density, leading to improved superconducting properties and consistent reversibility.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Superconductivity
Background:
- Superconducting materials are crucial for advanced technologies.
- Understanding the influence of microstructure on superconductivity is essential.
- Bismuth-based compounds offer unique superconducting properties.
Purpose of the Study:
- To investigate superconducting reversibility in NiBi3 grains embedded in a Bi matrix.
- To explore the effect of varying Ni content on the superconducting properties of Bi(100-x)Ni(x) samples.
- To correlate microstructural characteristics with observed superconducting behavior.
Main Methods:
- Sample preparation via co-deposition of Ni and Bi.
- Characterization using X-ray diffraction and transmission electron microscopy.
- Measurement of electrical transport and magnetic properties using a Physical Property Measurement System (PPMS).
Main Results:
- NiBi3 grain nucleation and density increase with Ni content (x=1-10%).
- Superconducting properties, including critical temperature and magnetoresistance, are influenced by Ni composition.
- A significant diamagnetic signal confirms the superconducting phase.
Conclusions:
- Superconducting reversibility was demonstrated within measurement precision.
- Observed reversibility aligns with Ekin's criteria.
- Encapsulation of NiBi3 grains by a superconducting Bi layer explains the observed phenomena.
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