🚀 go-pugleaf

In article <zyxm4pb@lynx.unm.edu> swami@chtm.eece.unm.edu (Swami srinivasan) writes:
>
>A few months back, there was talk about superconductivity in GaAs with
>Arsenic precipitates. As far as i can recall, Tc was below 30 K.
^^^^^^^^^^^^^^^^^^^^^^
>Just wondering if there has been anything new in the past couple of 
>months (been on a 6-week vacation).

I recall reading in Science Mag. (I think) that this claim of superconductivity
in GaAs was retracted.  I believe the authors later discovered that it was the
arsenic precipitates that were showing superconductivity and not the bulk GaAs.
This is a more plausible explanation since several arsenic compounds display
superconductivity at low temperature.  In particular it is likely that if they
used lead-tin solder to attach leads to their sample that impurity compounds
such as AsPb (Tc=8.4 K) and AsSn (Tc=4.1 K) were formed.  



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