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- W1978277939 abstract "Many different samples of Tl2Ba2Cu1O6 have been prepared by different heat treatments at relatively low temperature. The material as first prepared is clearly orthorhombic and non-superconducting, but on annealing and quenching, the samples become almost tetragonal with high Tc. Various Tc values between <4 K and 70 K can thus be obtained, and the structure of these materials has been compared by neutron diffraction at 5 K and 300 K. For all samples 1/8th of the Tl3+O2- atoms are missing, creating the electron holes apparently necessary for superconductivity. The main difference between the various samples appears to be that the non-superconducting material is orthorhombic, with a well ordered superstructure, while the superconducting material is pseudo-tetragonal, with disordered oxygen within the TlO plane, as for the higher superconducting members of the Tl2CanBa2Cun+1O2(n+3) series. Superconductivity then appears to depend on the precise structural arrangement, and not just on stoichiometry and the number of electron holes." @default.
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- W1978277939 date "1988-10-01" @default.
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- W1978277939 title "Preparation and neutron diffraction of superconducting “tetragonal” and non-superconducting orthorhombic Tl2Ba2Cu1O6" @default.
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- W1978277939 doi "https://doi.org/10.1016/0921-4534(88)90760-5" @default.
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