Hall-Coefficient and Resistivity of Amorphous Ti1-Xalx Films
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The resistivity of codeposited amorphous Ti1-xAlx films has been measured from 1.5 to 300 K over the composition range 0.4 less-than-or-equal-to x less-than-or-equal-to 0.92, and the Hall coefficient has been measured at 4 K. The resistivity exhibits a relatively small temperature dependence. The magnitude of the room-temperature resistivity varies appreciably with composition, with a broad maximum around 250 muOMEGA cm near x almost-equal-to 0.5. The Hall coefficient is positive at x = 0.4 and increases to a maximum at x almost-equal-to 0.6. It becomes negative at x almost-equal-to 0.85 with a value comparable to that of liquid Al at the highest value of x. The positive values of the Hall coefficient and their dramatic increase with x below x almost-equal-to 0. 5 are discussed in terms of current theories for a positive Hall coefficient.