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.
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