EVALUATION OF EFFECTS OF NANOSCALE INHOMOGENEITIES ON THE SUPERCONDUCTING TRANSITION TEMPERATURE IN HYDROGEN-DOPED Zr-Co METALLIC GLASSES

IVAN KOKANOVIĆ^a, BORAN LEONTIĆ^a, JAGODA LUKATELA^b, DENIS DUJMIĆ^c and MILKO JAKŠIĆ^c

^aDepartment of Physics, Faculty of Science, University of Zagreb, P.O.Box 162,
HR-10001 Zagreb, Croatia
^bInstitute of Physics, P.O.Box 304, Zagreb, Croatia
^c``Ruđer Boškovć'' Institute, Zagreb, Croatia

Received 10 January 1997

This paper is dedicated to Professor A. Bonefačić on the occasion of his 70^th birthday

We present the results of measurements of electrical resistivity on hydrogen-doped Zr-Co metallic glass in the vicinity of the superconducting transition temperature, T_C, in the temperature range 1.5 K - 4.2 K. The hydrogen dopant lowers the superconducting transition temperature. At the same time, the superconducting transition region is broadened and ``steps'' appear in the resistance curve at the transition. Scanning proton microprobe and p-p scattering have been used to determine areal distributions of hydrogen and depth profiles in the samples studied. Hydrogen depth profiles at particular positions have been deconvoluted using cubic splines. We discuss the effects of different hydrogen environments on the superconducting transition temperature of Zr-Co-H metallic glasses.

UDC 537.312.62
PACS 74.70.Mq

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