Title of article :
Structure and superconductivity in FexCu1−xBa2YCu2O7+y superconductors synthesized by high pressure
Author/Authors :
Liu، نويسنده , , Y.H. and Che، نويسنده , , G.C. and Li، نويسنده , , K.Q. and Zhao، نويسنده , , Z.X. and Kou، نويسنده , , Z.Q. and Di، نويسنده , , N.L. and Cheng، نويسنده , , Z.H.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2005
Abstract :
Comprehensive studies of X-ray diffraction, oxygen content, superconductivity and Mössbauer effect have been made on FexCu1−xBa2YCu2O7+y superconductors (0.00≤x≤0.70) synthesized by ambient (AM) and high pressure (HP). Results indicate that all the HP-samples have tetragonal structure, smaller lattice parameter c and unit-cell volume than the AM-samples. The studies of oxygen content, and Mössbauer spectroscopy indicate that the HP-samples have higher oxygen content, carrier concentration and average valence of Fe than the AM-samples. Moreover, for the HP-samples more Fe atoms located in CuOx chains have fivefold-oxygen coordination. These are important reasons for the enhancement of Tc in the HP-samples.
Keywords :
B. High-pressure synthesis , D. Superconductivity , D. Local structure , E. Mِssbauer spectroscopy
Journal title :
Solid State Communications
Journal title :
Solid State Communications
