A new 92 K high-Tc superconductor. Hg-containing Tl-based 1212 phase

R. S. Liu; S. F. Hu; D. A. Jefferson; P. P. Edwards; P. D. Hunneyball

doi:10.1016/0921-4534(93)90188-V

A new 92 K high-T_c superconductor. Hg-containing Tl-based 1212 phase

R. S. Liu^*
, S. F. Hu
, D. A. Jefferson
, P. P. Edwards
, P. D. Hunneyball

^*Corresponding author for this work

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

48 Citations (Scopus)

Abstract

Bulk superconductivity up to 92 K has been achieved in the mercury-containing curprate (Tl_0.5Hg_0.5)Sr₂(Ca_1-xY_x)Cu₂ O_7-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 (Tl_0.5Pb_0.5)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 (T_c) at around 92 K for x=0.3. For compositions x<0.3, a decrease in T_c was observed.

Original language	English
Pages (from-to)	206-211
Number of pages	6
Journal	Physica C: Superconductivity and its Applications
Volume	205
Issue number	1-2
DOIs	https://doi.org/10.1016/0921-4534(93)90188-V
Publication status	Published - 1993 Jan 15
Externally published	Yes

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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@article{87da67a026f04aab837cf400bcbe331a,

title = "A new 92 K high-Tc superconductor. Hg-containing Tl-based 1212 phase",

abstract = "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 {\AA} and c ∼ 12.0 {\AA}. 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.",

author = "Liu, \{R. S.\} and Hu, \{S. F.\} and Jefferson, \{D. A.\} and Edwards, \{P. P.\} and Hunneyball, \{P. D.\}",

note = "Funding Information: We thank the Fellowship of Engineering, BICC plc.. SERC, BP, JEOL (UK) for support. We also acknowledge R.W. Smith, glass blower at Cavendish Lab., tbr help in encapsulating the samples. One of us (SFH) thanks the financial support from the Gir-ton College and Trustees of the Cambridge Overseas Trust.",

year = "1993",

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day = "15",

doi = "10.1016/0921-4534(93)90188-V",

language = "English",

volume = "205",

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journal = "Physica C: Superconductivity and its Applications",

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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.

N1 - Funding Information: We thank the Fellowship of Engineering, BICC plc.. SERC, BP, JEOL (UK) for support. We also acknowledge R.W. Smith, glass blower at Cavendish Lab., tbr help in encapsulating the samples. One of us (SFH) thanks the financial support from the Gir-ton College and Trustees of the Cambridge Overseas Trust.

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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A new 92 K high-T_c superconductor. Hg-containing Tl-based 1212 phase

Abstract

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