Neutron Diffraction Studies of High TC Superconductors

Hinks D. G.,Dabrowski B., Illinois Institute of Technology,Jorgensen J. D.,Soderholm L.,Beno M. A.

MRS Online Proceedings Library（2011）

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摘要

We have investigated the structure and composition of La2CuO4 (both pure and Sr-doped) and Nd(Ba2−xNdx)Cu3O7 using powder neutron diffraction. In La2−xSrxCuO4, Tc reacnes its maximum at x=0.15, after which vacancies are introduced in the 2D planes and superconductivity is destroyed. Superconductivity in La2CuO4 is not bulk. No evidence for nonstoichlometry in this material can be observed. In the Nd(Ba2−xNdx)Cu3O7 system, Tc is a complex function of oxygen ordering and electronic effects.

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关键词

crystal structure,single crystal,thermodynamics,neutron diffraction,superconductors,high temperature superconductor,powder diffraction,critical temperature,copper

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