Perplexities related to hall measurements in the liquid state

Abstract

Hall coefficients for liquid mercury and gallium have been obtained in the absence of applied pressure, in a higher frequency region using the recently developed ac-dc method. It has been found that a false signal similar to the Hall signal is produced due to nonlinearity at the electrode/solution interface. Another spurious signal results from the resistance change due to the Lorentz force. This change is proportional to B and B(exp 2) in the liquid states, however no change is observed in the solid states. Measured Hall coefficients were coincident with calculated values for the liquid states, however the solid state value for gallium was found to be much larger than that of the liquid.

液相水銀とガリウムのホール係数を、最近開発したac-dc法により非加圧下、高周波領域で求めた。電極と溶液界面での非線形性のためにホール信号に似たスプリアス信号が生じることが分かった。他の誤ったシグナルは、ローレンツ力による抵抗の変化から生じる。この変化は液体状態ではBおよびB{2}に比例するが、固体状態では変化は無かった。液体状態では、ホール係数の測定値は計算値と一致したが、ガリウムに対する固体状態の値は液体のそれに比べて、より大きかった。