An unusual phase transition to a second liquid vortex phase in the superconductor YBa2Cu3O7
Article Abstract:
Research is presented describing the determination of the critical point at which the solid vortex phase in the YBa2Cu3O7 copper oxide superconductor melts to a liquid phase. The results of the research show the existence of a reversible second-order transition that is above this critical point.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2001
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Imaging of transport currents in superconducting (Bi,Pb)2Sr2Ca2Cu3Ox composites
Article Abstract:
Spatial variations in transport critical current density in silver-sheathed Bi-2223 multifilamentary composites at close to real operating conditions have been measured using a modified applied field magneto-optical imaging technique. This procedure helps to gain an understanding of the connection between current flow and the microstructure of superconductors. Second-phase particles frequently interrupt the current path in superconductor/silver interfaces, preventing a high-current path, but three-times the current density could be achieved by eliminating the second-phase particles.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1995
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Calorimetric measurement of the latent heat of vortex-lattice melting in untwinned YBa2Cu3O7-delta
Article Abstract:
A calorimetric measurement of latent heat reveals that the magnetic vortex lattice of YBa2Cu3O7-delta superconductors in a field penetrated state shows a first order phase transition on increasing the temperature of the external magnetic field. The result agrees with the result obtained from magnetization data and shows the presence of a well defined phase boundary. This transition has a translational symmetry, which is true for phase transition of electronic subsystem of copper oxide superconductors.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1996
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