A Superconductor Without Fixed Tc

DeltaV · Post by **DeltaV** » Wed Mar 17, 2010 7:12 am

http://www.superconductors.org/Lbcco.htm

MSimon · Post by **MSimon** » Wed Mar 17, 2010 11:29 am

What is interesting is that there is now at least an empirical theory of how to make some kinds of SCs.

DeltaV · Post by **DeltaV** » Wed Mar 17, 2010 4:56 pm

Looks like his last measurement had the highest Tc. Assuming that his experimental setup is not at fault, I'm wondering if hysteresis and/or a "learning" effect is occurring, and how the duration and transient characteristics of the applied voltage affects the results. Wouldn't it be cool if Tc went up with use?

Giorgio · Post by **Giorgio** » Thu Mar 18, 2010 7:36 am

I am also more prone to see this as a measurement error or sample modification between the various experiments.

In his own words:
"RESEARCH NOTE: Copper-oxides have been found to be strongly hygroscopic. All tests should be performed immediately after annealing."

Interesting stuff nevertheless.

DeltaV · Post by **DeltaV** » Thu Mar 18, 2010 7:55 pm

If H2O content affected Tc, that would be of great interest.

By that I mean if it shifted Tc up or down, vs. just making a transition appear or disappear at some constant T.