Semiconducting TlSr2RCu2O7 (R=rare earth) and its superconducting derivatives |
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| Authors: | Z. Z. Sheng Y. Xin D. X. Gu J. M. Meason J. Bennett D. Ford D. O. Pederson |
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| Affiliation: | (1) Department of Physics, University of Arkansas, 105 Physics Building, 72701 Fayetteville, AR, USA |
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| Abstract: | Semiconducting TlSr2RCu2O7 (R=Pr or Er) with a 1212-type structure has been synthesized in the single-phase form. Partial substitution of Sr2+ for R3+ converts this semiconductor to a 90 K superconductor TlSr2(R1–ySry)Cu2O7. A combination substitution, Sr2+ for R3+ and Pb4+ for Tl3+, leads to the Ca-free 100 K superconductor (Tl, Pb)Sr2(R, Sr)Cu2O7. The results are explained in the framework of the mixed Cu2+/Cu3+ valence. |
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