Abstract:We compare results of high-resolution magnetic flux (susceptibility)
measurements in very weak magnetic field, performed of three classes of
superconductors. They reveal astonishing details of the transition to the
superconducting state. Although Pb behaves also on this scale according to BCS
predictions, La is more reminiscent of HTS materials, which exhibit anomalous
features. We suggest that known structure peculiarities are due to a strong
electron-lattice instability and lead to a resonance electron back … Show more
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