Thermodynamic observation of first-order vortex-lattice melting transition in Bi2Sr2CaCu2O8
Article Abstract:
The results of a study on Bi2Sr2CaCu2O8, a type II superconductor in a magnetic field, shows that the magnetic vortex filaments in a high-temperature superconducting compound melt according to a pattern that follows first-order phase transition. The results also showed that the vortex liquid expands upon freezing in the same way that water expands when transformed into ice. The study demonstrates that matter composed of flexible directed lines exhibits different behavior from assemblies of point-like molecules or atoms.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1995
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Possible coexistence of s- and d-wave condensates in copper oxide superconductors
Article Abstract:
Two different superconducting gaps having the same transition temperature and dissimilar symmetries exists in copper oxide superconductors. This fact is responsible for the s-wave character perpendicular to the CuO2 planes and d-wave character along the 'a' or 'b' axis of YBa2Cu3O(sub 7-delta) of the wavefunction of superconductor condensate. Based on these assumptions, it was possible to explain the in-plane tunneling between the Yttrium barium copper oxides films.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1995
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Some vortices like it hot
Article Abstract:
Research on copper-oxide superconductors and the Nernst effect is discussed. Compounds with copper-oxygen layers are superconductors at high temperatures and they are found to act differently to other superconductors.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2000
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