Accession Number : ADA335338

Title :   Materials Science Studies of High-Temperature Superconducting Ceramic Oxides

Descriptive Note : Final rept. May 88-Mar 93

Corporate Author : ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s) : Vezzoli, G. C. ; Chen, M. F. ; Craver, F. ; Katz, R. N.

PDF Url : ADA335338

Report Date : DEC 1997

Pagination or Media Count : 253

Abstract : Herein is presented the results of a comprehensive program of research aimed at understanding the materials science and the mechanistic physics of high-temperature superconducting oxides. This comprehensive research program has identified the materials properties that are consistently associated with high-Tc superconductors and has shown that the mechanism that gives rise to the phenomenon of high-Tc superconductivity is associated with bound holes that are due to charge-transfer excitations at high frequency. The latter are a result of the high internal electric field present in high-Tc materials, owing to the asymmetry of the crystal structure. The interaction of bound holes with free electrons and the interaction of local spin fluctuations with the spin of free electrons generate a charge density wave and a spin density wave that cause Cooper pairing.

Descriptors :   *CERAMIC MATERIALS, *OXIDES, *HIGH TEMPERATURE SUPERCONDUCTORS, HIGH FREQUENCY, CRYSTAL STRUCTURE, INTERACTIONS, COMPOSITE MATERIALS, HOLES(ELECTRON DEFICIENCIES), ELECTRIC FIELDS, VORTICES, FREE ELECTRONS, ASYMMETRY, CHARGE DENSITY, ANTIFERROMAGNETISM, SPIN WAVES.

Subject Categories : Ceramics, Refractories and Glass
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE