Abstract
We have measured the superconductivity transition temperature and transport properties of the three Zr-based bulk metallic glasses(BMGs), Zr_{50}Cu_{40}Al_{10}, Zr_{50}Cu_{30}Ni_{10}Al_{10}, and Zr_{41.2}Ti_{13.8}Cu_{12.5}Ni_{10}Be_{22.5} which were fabricated by using the ladle-hearth type arc-melt tilt-casting machine. At first,We determine the amorphous state of these alloys by X-ray diffraction pattern. The resistivities of them at roomtemperature are 350, 236, 196 micro-omega cm, respectively. And the temperature coefficients of the resistivities (TCR) are all negative. We also fit the temperature dependence torho=a[1+be^{-2W(T)}] from 4.2K to 300K. By using this formula, we can calculate the Debye temperatures of the three Zr-based BMGs. At much lower temperature, the superconducting transition temperature of the BMGs is separately determined by using a 3He low temperature measurement system and their Tc are 0.61K, 0.61K, 0.73K, respectively. The magnetoresistance of theses threeBMGs show that when the temperature is 5K, all of them exhibit positive magnetoresistance due to the superconducting fluctuation, but at other fixed temperature such as 100K, 200K, 300K, there are no apparent field dependence of the resistance, except for the Zr_{50}Cu_{40}Al_{10} that exhibits small variation negative magnetoresistance at 300K.