FIZIKA A 4 (1995) 3, 615-622

INFLUENCE OF HYDROGEN ON THE SUPERCONDUCTING AND THE PARAMAGNETIC PROPERTIES OF SOME Zr-3d METALLIC GLASSES

IVAN KOKANOVI�, BORAN LEONTI� and JAGODA LUKATELA^a
Faculty of Science, University of Zagreb, POB 162, HR-10001 Zagreb, Croatia
^aInstitute of Physics, POB 304, HR-10001 Zagreb, Croatia

Dedicated to Professor Mladen Pai� on the occasion of his 90^th birthday

Received 10 July 1995

We present the experimental results on the effects of hydrogen doping on the superconducting and paramagnetic properties of zirconium-rich (x > 0.66) Zr_x3d_1-x metallic glasses. Zr_0.70Cu_0.30, Zr_0.67Ni_0.33 and Zr_0.67Co_0.33 are superconductors with a superconducting transition temperature in the vicinity of 2 K, while Zr_0.68Fe_0.32 is a paramagnet down to very low temperatures because of pronounced spin-fluctuations. The magnetoresistivity data are analysed using theoretical models of weak location and electron-electron interactions. Doping with hydrogen reduces the superconducting transition temperature in Zr_0.70Cu_0.30, Zr_0.67Ni_0.33 and Zr_0.67Co_0.33 metallic glasses. The magnetoresistivity enhancement of hydrogen-doped Zr_0.68Fe_0.32 has been attributed to the increase of the Stoner factor, (1-I)^-1. That increase indicates an enhancement of spin fluctuations with hydrogen.

UDC 537.312, 538.95
PACS 74.70.-b, 75.20.-g

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