Phys. Rev. Lett. 76, 1348–1351 (1996)Dependence of Superconducting Transition Temperature on Doping and Structural Distortion of the CuO2 Planes in La2-xMxCuO4 (M = Nd, Ca, Sr)Received 26 April 1995; published in the issue dated 19 February 1996 By comparing structural and superconducting properties of La2-x-yCaxNdyCuO4 to La2-xSrxCuO4 we have separated the effects of structure and doping on the superconducting Tc. At a fixed doping level, the highest Tc is found for flat and square CuO2 planes in the tetragonal structure. Tc is reduced by the structural distortions of the CuO2 planes in the orthorhombic structure. The local minimum of Tc vs doping observed around x∼0.12 indicates the presence of a weakly split singularity of the electronic density of states for the orthorhombic material. © 1996 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.76.1348
DOI:
10.1103/PhysRevLett.76.1348
PACS:
74.72.Dn, 74.62.Dh
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