Structural and superconducting properties of (Hg1 - XTlx)2Ba2Can-1Cu nOy (n = 3, 4) superconductors prepared under high pressure

T. Tatsuki; A. Tokiwa-Yamamoto; T. Tamura; X. J. Wu; Y. Moriwaki; S. Adachi; K. Tanabe

doi:10.1016/S0921-4534(96)00590-4

Structural and superconducting properties of (Hg_{1 - X}Tl_x)₂Ba₂Ca_n-1Cu _nO_y (n = 3, 4) superconductors prepared under high pressure

T. Tatsuki, A. Tokiwa-Yamamoto, T. Tamura, X. J. Wu, Y. Moriwaki, S. Adachi, K. Tanabe

Global course of Engineering and Science

Research output: Contribution to journal › Article

8 Citations (Scopus)

Abstract

Double (Hg,Tl)-O layer superconductors with three or four CuO₂ sheets, (Hg_1-xTl_x)₂Ba₂Ca _n-1Cu_nO_y (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. T_c 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, T_c 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.

Original language	English
Pages (from-to)	65-71
Number of pages	7
Journal	Physica C: Superconductivity and its applications
Volume	273
Issue number	1-2
DOIs	https://doi.org/10.1016/S0921-4534(96)00590-4
Publication status	Published - 1996 Dec 15

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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Tatsuki, T., Tokiwa-Yamamoto, A., Tamura, T., Wu, X. J., Moriwaki, Y., Adachi, S., & Tanabe, K. (1996). Structural and superconducting properties of (Hg_{1 - X}Tl_x)₂Ba₂Ca_n-1Cu _nO_y (n = 3, 4) superconductors prepared under high pressure. Physica C: Superconductivity and its applications, 273(1-2), 65-71. https://doi.org/10.1016/S0921-4534(96)00590-4

Structural and superconducting properties of (Hg_{1 - X}Tl_x)₂Ba₂Ca_n-1Cu _nO_y (n = 3, 4) superconductors prepared under high pressure. / Tatsuki, T.; Tokiwa-Yamamoto, A.; Tamura, T.; Wu, X. J.; Moriwaki, Y.; Adachi, S.; Tanabe, K.

In: Physica C: Superconductivity and its applications, Vol. 273, No. 1-2, 15.12.1996, p. 65-71.

Research output: Contribution to journal › Article

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abstract = "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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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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