Superconductivity and Quantum Coherence

The Meissner effect leads to the stunning
levitation effects that underlie many of the
proposed technological applications of
superconductivity (see examples sheet).
The superconducting state is destroyed
above a critical field H c
Ideal magnetisation curve…
H c1 H c H c2
H
…and so-called type-II superconductivity
(which we’ll discuss later)
B
M
NB: These curves apply for a
magnetic field along a long rod.
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