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I encountered this in the context of using squid microscopy to test for d-wave pairing in an iron arsenide superconductor where the goal of the experiment was to detect half integer flux quantum transitions to indirectly observe a change in the order parameter.

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Which reference did you use? – Qmechanic Jan 18 '13 at 6:47
Integer and half-integer flux-quantum transitions in a niobium–iron pnictide loop by Chen et al. Nat Phys 6 – LlamaD Jan 18 '13 at 9:27

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