sci.physics.electromag

I am not settled yet as to the extent of AC current in
superconductivity versus DC current and the literature
on superconductivity does not make the issue clear. Most books you
read on superconduction seldom if ever
mention what current, whether AC or DC was used and no-one in physics
or chemistry devotes much time
to clarity over how superconduction behaves when using DC current
compared to AC current. So those
of us who do not have the luxury of working inside a actual
superconductor lab with the materials at hand
have a hard time of sorting out the truth over the issue of DC versus
AC in superconduction.

As far as I can tell, AC current creates vortices in the
superconduction state and thus depending on the
amperage or voltage ruins the superconduction state. So that most data
and information about
superconduction was held with a DC current.

"Handbook of Superconductivity" Poole, 2000, on page 44 says:
"Even though superconductors have, by nature, zero dc resistance, it
is still of interest to see how close
they come to zero."

That statement is not clear as to whether any superconductor can be
zero AC resistance, or whether
only zero DC resistance exists.

On page 30 of Poole's Handbook states: " we have for the dc electrical
conductivity c_0 and its
reciprocal the resistivity r ....... Typically, v_F approx 10^6 m/s
for good conductors (i.e., 1/300
the speed of light) and it is perhaps one-tenth of this value for A-15
compounds and high-temperature
superconductors in their normal states."

What I would like to see in some handbook of superconductors is an
entire chapter devoted solely
to the discussion of DC current versus AC current and drift speed and
other facets of current.

The trouble with most superconductivity book in print is that 1/2 or
more of the book is spent
on the phony baloney of phonons, Cooper pairing, and the BCS fakery.
Poole's handbook is
better because it is one of those that does not spend much time on the
fakeries of phonons,
Cooper pairing and BCS malarkey.

However, Poole's handbook does not make clear the factual data as to
DC currents involved
and AC currents involved in superconduction. Apparently no-one in
physics or chemistry has
made that clarity for superconductivity. A case of where lab
technicians know the data but no-one
outside the lab has access to that data.

Archimedes Plutonium
www.iw.net/~a_plutonium
> whole entire Universe is just one big atom
> where dots of the electron-dot-cloud are galaxies