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- W1986000319 abstract "Superconductivity in cuprates of the general formula TlCa1-xLnxSr2Cu2O7+ delta has been investigated as a function of Ln and x. Compositions with 0.25<or=x<or=0.8 are superconducting for all Ln with Tc in the range 60-90 K (except when Ln=Yb where x=1 is also superconducting); the value of the Tc varies with x as well as Ln. When x approximately=0.25, electrons are the majority charge carriers, while holes are the majority carrier when x >0.25. Thus, these cuprates exhibit a composition-dependent electron- or hole-superconductivity. In the normal state, most of the members of the series traverse compositionally determined metal-insulator transitions. High-energy spectroscopies show the presence of Cu in the 1+ and 2+ states. The Raman frequency around 525 cm-1 characteristic of the Tl-O2-Cu linkage is sensitive to both Ln and x, indicating a possible involvement in the mechanism of superconductivity." @default.
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- W1986000319 date "1989-09-01" @default.
- W1986000319 modified "2023-09-23" @default.
- W1986000319 title "Investigation of novel cuprates of the TlCa1-xLnxSr2Cu2O7- δ(Ln=rare earth) series showing electron- or hole-superconductivity depending on the composition" @default.
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- W1986000319 doi "https://doi.org/10.1088/0953-2048/2/3/009" @default.
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