Are superconductors really superconducting?

Article Abstract:

Low-temperature type II superconductors lose electrical resistance far less readily in cooling temperatures than do the copper oxide high-temperature superconductors. This difference in properties indicates that the type II superconductors' resistivity is zero when the temperature drop occurs in a magnetic field. However, experimental and theoretical data show that the colder temperatures cause the type II material to exhibit a sharp phase transition to a bona fide superconducting, impurity-containing phase marked by a chaotic, frozen magnetic flux vortices.

Electric properties

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Evidence for stripe correlations of spins and holes in copper oxide superconductors

Article Abstract:

Repression of superconductivity in La(sub 2-x)Ba(sub x)CuO(sub4) and related compounds is detected when the hole concentration is near 1/8. Superconductivity in copper oxides is associated to the spatial modulations of spin and charge density. The reduced superconductivity is due to the dynamic two dimensional spin and charge stripe correlations. The holes are accumulated periodically in domain walls.

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Vortex-like excitations and the onset of superconducting phase fluctuation in underdoped La2-xSrxCuO4

Article Abstract:

Research into the behaviour of underdoped copper oxide superconductivity is presented. When a sample placed in a magnetic field has a thermal gradient applied vortices occur.

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