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1. Critical temperature and resistivity
The critical temperature (T c ) is the temperature at which the material's electrical resistivity falls below any measurable value (figure 3 ). Paradoxically, the resistivity of the material in its normal state above the critical temperature can be relatively high.
for YBaCuO (YBa 2 Cu 3 O 7-δ ), normal-state resistivity reaches 100 to 10,000 times that of copper at 100 K.
The evolution of resistivity above T...
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Critical temperature and resistivity
Diamagnetism. Meissner effect
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