Synthesis, structure, and superconductivity of La{sub 2-x}K{sub x}CuO{sub 4} | Zendy

Patricia M. Keane | Zendy; D. G. Hinks | Zendy; J. D. Jorgensen | Zendy

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Synthesis, structure, and superconductivity of La{sub 2-x}K{sub x}CuO{sub 4}

Author(s) -

Patricia M. Keane,

D. G. Hinks,

J. D. Jorgensen

Publication year - 1994

Publication title -

osti oai (u.s. department of energy office of scientific and technical information)

Language(s) - English

Resource type - Reports

DOI - 10.2172/396664

Subject(s) - tetragonal crystal system , orthorhombic crystal system , superconductivity , electrical resistivity and conductivity , neutron diffraction , magnetic susceptibility , x ray crystallography , materials science , crystallography , condensed matter physics , transition temperature , powder diffraction , phase (matter) , diffraction , crystal structure , chemistry , physics , optics , organic chemistry , quantum mechanics

Structural and superconducting properties of La{sub 2-x}K{sub x}CuO{sub 4} were studied by neutron and x-ray powder diffraction, ac magnetic susceptibility, and dc electrical resistivity. Superconductivity is observed in both orthorhombic and tetragonal phases with x{ge}0.06 and is absent for x{le}0.04. At room temperature, the system undergoes an orthorhombic-to-tetragonal phase transition at x{similar_to}0.07. Diffraction studies show no evidence of a low temperature tetragonal phase at 50 K. Comparison of these structural and superconducting properties with earlier data indicate that K contents have previously been highly overestimated

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