Superconductivity of Al/Al2O3 interface formed under shock-wave conditions

30th International Conference on Interaction of Intense Energy Fluxes with Matter

Shakhray, D.V.^1 ; Avdonin, V.V.^1 ; Palnichenko, A.V.^2 ; Vyaselev, O.M.^2

Institute of Problems of Chemical Physics, Russian Academy of Sciences, Academician Semenov Avenue 1, Chernogolovka, Moscow Region

142432, Russia^1

Institute of Solid State Physics, Russian Academy of Sciences, Institutskaya Street 2, Chernogolovka, Moscow Region

142432, Russia^2

关键词: AC Magnetic susceptibility;    Ac susceptibility;    DC magnetization;    Glassy dynamics;    Granular layer;    Shielding currents;    Shock wave treatments;    Wave conditions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/653/1/012039/pdf
DOI  :  10.1088/1742-6596/653/1/012039

来源: IOP

【 摘 要 】

A mixture of powdered Al and Al2O3has been subjected to a shock-wave pressure of ≈ 170 kbar, followed by vacuum-encapsulating and quenching of the product to liquid nitrogen. The ac magnetic susceptibility measurements of the samples have revealed metastable superconductivity with Tc≈ 37 K, characterized by glassy dynamics of the shielding currents below Tc. Comparison of the ac susceptibility and the dc magnetization measurements infers that the superconductivity arises within the interfacial granular layer formed between metallic Al and its oxide due to the shock-wave treatment.