Quantum decoherence
http://en.wikipedia.org/wiki/Quantum_decoherence
In quantum mechanics, quantum decoherence is the loss of coherence or ordering of the phase angles between the components of a system in a quantum superposition.
Excitation of large-amplitude coherent optical phonons
gives rise to a periodic modulation of the X-ray diffraction
efficiency. Stronger excitation corresponding to atomic displacements
exceeding 10 per cent of the nearest-neighbour distance
—
near
the Lindemann limit
—
leads to a subsequent loss of
long-range order, which is most probably due to melting of the
material.http://www.exp.physik.uni-due.de/bovensiepen/Publikationen/Sokolowski03Nat422_287.pdf
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