Hole concentration and critical temperature in the Tl2-x-zBa2Ca2+xCu3O10-y system

M. Paranthaman; M. Foldeaki; A. M. Hermann

doi:10.1016/0921-4534(92)90756-3

Hole concentration and critical temperature in the Tl_2-x-zBa₂Ca_2+xCu₃O_10-y system

M. Paranthaman, M. Foldeaki, A. M. Hermann

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

Single Phase bulk Tl-2223 samples were prepared in the Tl_2-x-zBa₂Ca_2+xCu₃O_10-y system with x between 0 and 0.4. A small impurity phase was found at x=0.6. All samples were found to be tetragonal. The lattice parameters a and c were nearly constant with the value of 3.858±0.002 Å and 35.71±0.01 Å, respectively. The T_c varied between 112 and 118 K for the "as-synthesized" samples. Wet chemical analysis showed that all samples were both Tl and oxygen deficient. The T_c was found to increase with increasing hole concentration. The origin of the holes for all these samples is due to Ca²⁺ substitution on the Tl³⁺ sites and overlap of Tl-6s band with the conduction band of the CuO₂ sheets. Furthermore, the Tl-6s band overlap was found to be constant for all the samples studied.

Original language	English
Pages (from-to)	161-165
Number of pages	5
Journal	Physica C: Superconductivity and its Applications
Volume	192
Issue number	1-2
DOIs	https://doi.org/10.1016/0921-4534(92)90756-3
State	Published - Mar 1 1992
Externally published	Yes

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title = "Hole concentration and critical temperature in the Tl2-x-zBa2Ca2+xCu3O10-y system",

abstract = "Single Phase bulk Tl-2223 samples were prepared in the Tl2-x-zBa2Ca2+xCu3O10-y system with x between 0 and 0.4. A small impurity phase was found at x=0.6. All samples were found to be tetragonal. The lattice parameters a and c were nearly constant with the value of 3.858±0.002 {\AA} and 35.71±0.01 {\AA}, respectively. The Tc varied between 112 and 118 K for the {"}as-synthesized{"} samples. Wet chemical analysis showed that all samples were both Tl and oxygen deficient. The Tc was found to increase with increasing hole concentration. The origin of the holes for all these samples is due to Ca2+ substitution on the Tl3+ sites and overlap of Tl-6s band with the conduction band of the CuO2 sheets. Furthermore, the Tl-6s band overlap was found to be constant for all the samples studied.",

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AU - Foldeaki, M.

AU - Hermann, A. M.

PY - 1992/3/1

Y1 - 1992/3/1

N2 - Single Phase bulk Tl-2223 samples were prepared in the Tl2-x-zBa2Ca2+xCu3O10-y system with x between 0 and 0.4. A small impurity phase was found at x=0.6. All samples were found to be tetragonal. The lattice parameters a and c were nearly constant with the value of 3.858±0.002 Å and 35.71±0.01 Å, respectively. The Tc varied between 112 and 118 K for the "as-synthesized" samples. Wet chemical analysis showed that all samples were both Tl and oxygen deficient. The Tc was found to increase with increasing hole concentration. The origin of the holes for all these samples is due to Ca2+ substitution on the Tl3+ sites and overlap of Tl-6s band with the conduction band of the CuO2 sheets. Furthermore, the Tl-6s band overlap was found to be constant for all the samples studied.

AB - Single Phase bulk Tl-2223 samples were prepared in the Tl2-x-zBa2Ca2+xCu3O10-y system with x between 0 and 0.4. A small impurity phase was found at x=0.6. All samples were found to be tetragonal. The lattice parameters a and c were nearly constant with the value of 3.858±0.002 Å and 35.71±0.01 Å, respectively. The Tc varied between 112 and 118 K for the "as-synthesized" samples. Wet chemical analysis showed that all samples were both Tl and oxygen deficient. The Tc was found to increase with increasing hole concentration. The origin of the holes for all these samples is due to Ca2+ substitution on the Tl3+ sites and overlap of Tl-6s band with the conduction band of the CuO2 sheets. Furthermore, the Tl-6s band overlap was found to be constant for all the samples studied.

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Hole concentration and critical temperature in the Tl_2-x-zBa₂Ca_2+xCu₃O_10-y system

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