FIZIKA A 10 (2001) 3 , 113-120

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aDepartment of Physics, Faculty of Science, University of Zagreb, Zagreb, Croatia

bInstitute of Physics, POB 304, Zagreb, Croatia

Dedicated to Professor Kseno Ilakovac on the occasion of his 70th birthday

Received 26 April 2001; revised manuscript received 4 December 2001
Accepted 3 December 2001        Online 30 December 2001

The magnetisation of hydrogen-doped (Zr80Co20)1-xHx metallic glasses has been measured in the temperature range 1.7 K -100 K for various dopant concentrations. The system is paramagnetic and becomes superconducting at Tc = 3.98 K. The magnetic susceptibility of the undoped sample above Tc is strongly temperature dependent and shows the Curie-Weiss behaviour, whereas in the doped amples it is temperature independent. It has been also found that the magnetic susceptibility at 100 K, c(100 K), decreases with hydrogen concentration. The low-temperature upturn in the undoped sample most likely results from a small amount of magnetic impurities. Doping the sample with small hydrogen concentration results in the screening of magnetic impurities thus reducing the Curie-Weiss contribution to the magnetic susceptibility. The form and magnitude of the observed temperature dependence of the magnetic susceptibility are well accounted for by the sum of the Curie-Weiss term and the quantum corrections to the susceptibility.

PACS numbers: 72.15.Gd, 72.15.Rn, 75.20.-g
UDC 537.312, 538.95
Keywords: galvanomagnetic effects, disordered systems, metals, quantum localisation
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