[gus_massa]

Why the experimental points don't have error bars?

Is it not possible to use four terminal sensing? https://en.wikipedia.org/wiki/Four-terminal_sensing Perhaps the sample is too irregular, but for very low resistance samples using only two terminals never work.

Can they use a lock-in amplifier? https://en.wikipedia.org/wiki/Lock-in_amplifier When it works, it's like magic. I'm not sure that it is useful here

> I attached them as appropriate to the second-rate equipment I scavenged from the back of the lab, none of which worked properly.

Yep, that's usual.

In next life, remember to be a mathematician.

[davrosthedalek]

Lock-in amplifiers are indeed great. They essentially shift your signal up in frequency, where you have less background. Here, it might be hard to apply because you would need to modulate the heating. Not impossible, but the maximum frequency is certainly limited.

Part of being a physicist is having a high pain tolerance to non-working hardware. This includes cables.