I am trying to do 2 probe measyrement using 4 probe system. I am applying to the force terminal to the outermost probe tips. Each tip is separated by 0.5 mm. I tries with lateral configuration device where I am using ruthenium as a contact. I am observing evertime same kind of plot having two different voltage for zero current. Also plot is same when i am removing tips from sample but with less current vales. The inner tips are also touching the sample but connected with anything.
I can't understand if its sample problem or instrument problem. Please give me your suggestion about.
Xie, Z., Song, C., Andreaus, B., Navessin, T., Shi, Z., Zhang, J., & Holdcroft, S. (2006). Discrepancies in the measurement of ionic conductivity of PEMs using two-and four-probe AC impedance spectroscopy. Journal of the Electrochemical Society, 153(10), E173.
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