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Superconductivity in Hierarchical 3D Nanostructured Pb–In Alloys
oleh: Artem F. Shevchun, Galina K. Strukova, Ivan M. Shmyt’ko, Gennady V. Strukov, Sergey A. Vitkalov, Dmitry S. Yakovlev, Ivan A. Nazhestkin, Dmitry V. Shovkun
| Format: | Article |
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| Diterbitkan: | MDPI AG 2022-10-01 |
Deskripsi
The superconducting properties of hierarchical nanostructured samples of Pb–In alloys have been studied by the measurement of dynamic susceptibility <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>χ</mi><mo>(</mo><mi>T</mi><mo>)</mo></mrow></semantics></math></inline-formula> temperature dependence. Symmetric samples with different shapes and sizes were formed on a brass metallic net by cathode-metal electrodeposition with a programmed pulsing current. Two different kinds of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>χ</mi><mo>(</mo><mi>T</mi><mo>)</mo></mrow></semantics></math></inline-formula> dependence were observed in synthesized structures. The first kind was a broad superconductive transition without energy dissipation with a very weak response to the external magnetic field. The second kind was, conversely, an abrupt transition signifying an energy dissipation with a significant field response. This behavior depends on the ratio between a superconducting domain size (defined by the London penetration depth <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>λ</mi></semantics></math></inline-formula>) and a crystallite size. In these cases, one or several superconducting domains are present in a sample. This result paves the way to controlling a superconducting domain size in materials with the parameters of a pulsed current.