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To: Time Traveler who wrote (5853)4/29/1998 6:59:00 AM
From: Maxwell  Read Replies (2) of 6843
 
Time Traveller:

<<For your super-conductor library, you do not have to achieve zero resistance at absolute zero. Although the DC resistance goes to zero at the super-conducting temperature and material, does the AC resistance also go to zero as well?>>

For superconducting material below Tc, the DC resistance is 0. The AC resistance becomes significant above a certain frequency. For Niobium where the Tc=9K the AC resistance becomes significant above a frequency of a few hundred of gigahertz. As a rule of thumb the superconductor becomes a lousy conductor at frequency above its Josephson frequency. For Niobium is 600GHz and for YBCO (ceramic superconductor of Tc=92K) it is about 2000GHz or 2THz.

Maxwell
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