TY - JOUR
T1 - A new 92 K high-Tc superconductor. Hg-containing Tl-based 1212 phase
AU - Liu, R. S.
AU - Hu, S. F.
AU - Jefferson, D. A.
AU - Edwards, P. P.
AU - Hunneyball, P. D.
PY - 1993/1/15
Y1 - 1993/1/15
N2 - Bulk superconductivity up to 92 K has been achieved in the mercury-containing curprate (Tl0.5Hg0.5)Sr2(Ca1-xYx)Cu2 O7-δ when x=0.3. Based on X-ray and electron diffraction and electron probe microanalyzer results, we identify the phase responsible for the superconductivity to be similar to that of (Tl0.5Pb0.5)Sr2CaCu2O7 (so-called 1212 phase) with a space group of P4/mmm and lattice constants of a ∼ 3.8 Å and c ∼ 12.0 Å. Moreover, neither superlattice nor intergrowth along the a* and c * directions were observed by electron diffraction. An increase in Ca2+ doping, 0.5≤x≤0.3, into the Y3+ sites results in a maximum superconducting transition temperature (Tc) at around 92 K for x=0.3. For compositions x<0.3, a decrease in Tc was observed.
AB - Bulk superconductivity up to 92 K has been achieved in the mercury-containing curprate (Tl0.5Hg0.5)Sr2(Ca1-xYx)Cu2 O7-δ when x=0.3. Based on X-ray and electron diffraction and electron probe microanalyzer results, we identify the phase responsible for the superconductivity to be similar to that of (Tl0.5Pb0.5)Sr2CaCu2O7 (so-called 1212 phase) with a space group of P4/mmm and lattice constants of a ∼ 3.8 Å and c ∼ 12.0 Å. Moreover, neither superlattice nor intergrowth along the a* and c * directions were observed by electron diffraction. An increase in Ca2+ doping, 0.5≤x≤0.3, into the Y3+ sites results in a maximum superconducting transition temperature (Tc) at around 92 K for x=0.3. For compositions x<0.3, a decrease in Tc was observed.
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U2 - 10.1016/0921-4534(93)90188-V
DO - 10.1016/0921-4534(93)90188-V
M3 - Article
AN - SCOPUS:0027201463
VL - 205
SP - 206
EP - 211
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
SN - 0921-4534
IS - 1-2
ER -