TY - JOUR
T1 - Structural and superconducting properties of (Hg1 - XTlx)2Ba2Can-1Cu nOy (n = 3, 4) superconductors prepared under high pressure
AU - Tatsuki, T.
AU - Tokiwa-Yamamoto, A.
AU - Tamura, T.
AU - Wu, X. J.
AU - Moriwaki, Y.
AU - Adachi, S.
AU - Tanabe, K.
PY - 1996/12/15
Y1 - 1996/12/15
N2 - Double (Hg,Tl)-O layer superconductors with three or four CuO2 sheets, (Hg1-xTlx)2Ba2Ca n-1CunOy (x = 0.3-0.6; n = 3, 4), have been synthesized under high pressure and high temperature. These compounds are members of a new homologous series, (Hg,Tl)-22(n - 1)n. The effects of Tl content on the formation and superconductivity of the (Hg,Tl)-2223 and -2234 phases are investigated. Both the phases are stabilized for the nominal Tl content x of 0.3-0.6. Tc of as-sintered (Hg,Tl)-2223 phases increases from 45 K to 81 K with an increase in x, and that of Ar-annealed samples increases up to ∼ 90 K, accompanied with an expansion of the c-axis. These changes can be explained considering that as-synthesized 2223 phases are highly overdoped. In contrast, Tc of (Hg,Tl)-2234 phases is almost unchanged (∼ 115 K) irrespectively of both the Tl content and Ar-annealing, suggesting that they are nearly optimally doped.
AB - Double (Hg,Tl)-O layer superconductors with three or four CuO2 sheets, (Hg1-xTlx)2Ba2Ca n-1CunOy (x = 0.3-0.6; n = 3, 4), have been synthesized under high pressure and high temperature. These compounds are members of a new homologous series, (Hg,Tl)-22(n - 1)n. The effects of Tl content on the formation and superconductivity of the (Hg,Tl)-2223 and -2234 phases are investigated. Both the phases are stabilized for the nominal Tl content x of 0.3-0.6. Tc of as-sintered (Hg,Tl)-2223 phases increases from 45 K to 81 K with an increase in x, and that of Ar-annealed samples increases up to ∼ 90 K, accompanied with an expansion of the c-axis. These changes can be explained considering that as-synthesized 2223 phases are highly overdoped. In contrast, Tc of (Hg,Tl)-2234 phases is almost unchanged (∼ 115 K) irrespectively of both the Tl content and Ar-annealing, suggesting that they are nearly optimally doped.
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U2 - 10.1016/S0921-4534(96)00590-4
DO - 10.1016/S0921-4534(96)00590-4
M3 - Article
AN - SCOPUS:0030388067
VL - 273
SP - 65
EP - 71
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
SN - 0921-4534
IS - 1-2
ER -