Abstract:
Studies of superconductivity in the porous glass/eutectic In-Ag alloy nanocomposite were carried out. We measured temperature dependences of magnetization at different magnetic fields under the ZFC, FCC, and FCW protocols, as well as the magnetization isotherms. Two superconducting transitions with remarkably different changes of their temperatures with changing magnetic field were found. The magnetic field-temperature phase diagram was obtained. Complicated shapes of the magnetization isotherms were revealed. Unusual shifts of the branches of the magnetization isotherms were observed at increasing and decreasing magnetic field. The obtained results were treated assuming the coexistence of strongly and weakly linked indium segregates within the pore network and the emergence of ferromagnetic order at the interface between indium and AgIn$_2$ intermetallic segregates.
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