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You sure it isn’t Schottky diodes formed by the metallic contacts that are interfering with the measurement of the bulk germanium properties?

I’d sputter deposit metallic contact regions and solder to those, then maybe compare two different thickness samples and look at the difference in resistivity vs. temperature, essentially de-embedding your fixture.

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Came here to say this. You can’t solder leads on to semiconductors willy-nilly. The work functions are too different. So instead of an ohmic contact, you get a diode.

Ok, I'm glad someone posted something.

It's not my sub field, but the description of the setup seemed soo haphazard

Could they measure the resistance in two direction, then subtract one from another to isolate the symmetric part?

Possibly, but the OP is probably measuring the equivalent of back-to-back series diodes, which would be very symmetrical (if built on the same process). With soldering though, I’m sure they are not equivalent. As the other poster said, they need Ohmic contacts.

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