Abstract
Superconductivity and crystalline structure were studied for two nanocomposites consistingof gallium loaded porous glasses with different pore sizes. The superconducting transitiontemperatures were found to differ from those in known bulk gallium modifications. Thetransition temperatures 7.1 and 6.7 K were ascribed to two new confined gallium structures,ι- andκ-Ga, observed by synchrotron radiation x-ray powder diffraction. The evolution ofsuperconductivity on decreasing the pore filling with gallium was also studied.
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