Measurement of low-temperature transport properties of Cu-based Cu-Zr-Ti bulk metallic glass

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Y. K. Kuo and K. M. Sivakumar
Department of Physics, National Dong Hwa University, Hualien 97401, Taiwan

C. A. Su, C. N. Ku, and S. T. Lin
Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan

A. B. Kaiser
MacDiarmid Institute for Advanced Materials and Nanotechnology, Victoria University of Wellington, P.O. Box 600, Wellington, New Zealand

J. B. Qiang, Q. Wang, and C. Dong
State Key Laboratory of Materials Modification & Department of Materials Engineering, Dalian University of Technology, Dalian 116024, China

Received 2 March 2006; revised 26 May 2006; published 26 July 2006

Thetransport properties, including electrical resistivity ( rho ), thermopower (S), and thermalconductivity ( kappa ) of bulk metallic glass alloys Cu₆₄Zr_28.5Ti_7.1, Cu_62.3Zr_23.7Ti₁₀, Cu_60.6Zr_26.9Ti_12.5and Cu_58.8Zr_26.2Ti₁₅ in the temperature range 10–300 K are reported. Thetemperature variations of electrical resistivity in these alloys, with anegative temperature coefficient, are found to be rather weak. Thesefindings are consistent with the metallic glass nature of thesecompounds. It is observed that the electrical resistivity increases withincreasing Ti concentration, ascribed to the enhancement of disorder withsuch a composition change. The magnetoresistivity of Cu₆₄Zr_28.5Ti_7.5 alloy decreaseswith increasing temperature and increases with increasing magnetic field, suggestingthat the weak localization effect dominates the electrical transport. Thetemperature-dependent thermopower and thermal conductivity characteristics are nearly identical andweakly independent of compositions. It is noted that the observed kappa (T) of Cu-Zr-Ti metallic glass alloys show notable similarities withthe quasicrystalline system. There are two main features in S(T),a knee around 120 K and a plateau below 50 K, whichrepresent the deviation from the expected linear behavior. A detailedtheoretical analysis has suggested that the appearance of the kneeis due to the electron-phonon interaction at low temperatures andthe plateau is associated with low-energy excitations in glasses.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.74.014208
DOI:	10.1103/PhysRevB.74.014208
PACS:	71.23.Cq; 73.61.Jc; 72.15.Cz; 72.15.Jf 71.23.Cq Electronic structure of amorphous semiconductors, metallic glasses, glasses 73.61.Jc Electrical properties of amorphous semiconductors; glasses (thin films) 72.15.Cz Electrical and thermal conduction in amorphous and liquid metals and alloys 72.15.Jf Thermoelectric and thermomagnetic effects (metals/alloys) YEAR: 2006
KEYWORDS:	copper alloys, zirconium alloys, titanium alloys, metallic glasses, thermoelectric power, thermal conductivity, magnetoresistance, weak localisation, electron-phonon interactions

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