Synthesis and neutron powder diffraction study of the superconductor HgBa2Ca2Cu3O8 + δ by Tl substitution

P. Dai; B. C. Chakoumakos; G. F. Sun; K. W. Wong; Y. Xin; D. F. Lu

doi:10.1016/0921-4534(94)02461-8

Synthesis and neutron powder diffraction study of the superconductor HgBa₂Ca₂Cu₃O_{8 + δ} by Tl substitution

P. Dai, B. C. Chakoumakos, G. F. Sun, K. W. Wong, Y. Xin, D. F. Lu

Single Crystal Diffraction

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Abstract

Substitution of Tl for Hg was performed in the Hg based 1223 phase HgBa₂Ca₂Cu₃O_{8 + δ} (T_c = 135 K), resulting in an increase of the superconducting transition temperature to 138 K for samples with a nominal composition of Hg_0.8Tl_0.2Ba₂Ca₂Cu₃O_{8 + δ}. The crystal structure of this solid solution has been investigated by neutron powder diffraction techniques at room temperature and at 10 K. The compound has the same crystal as Hg-1223 with the space group symmetry P4/mmm and lattice parameters a = 3.8489(1), c = 15.816(1) A ̊. Rietveld analysis results indicate that Hg is partially replaced by Tl, and the oxygen content, δ, is 0.33. The lattice-parameter changes resulting from the Tl substitution are too small to account for the T_c change by mimicking the effect of pressure. No phase transition occurs down to 10 K.

Original language	English
Pages (from-to)	201-206
Number of pages	6
Journal	Physica C: Superconductivity and its Applications
Volume	243
Issue number	3-4
DOIs	https://doi.org/10.1016/0921-4534(94)02461-8
State	Published - Mar 1 1995

Funding

We thank J.A. Fernandez-Baca, M. Yethiraj, R.M. Nicklow and H.A. Mook for stimulating conversations. This research was supported in part by the Division of Materials Sciences, U.S. Department of Energy under Contract No. DE-AC05-84OR21400 with Martin Marietta Energy Systems, Inc. and by Midwest Superconductivity, Inc.

Funders	Funder number
Division of Materials Sciences
Midwest Superconductivity, Inc.
U.S. Department of Energy	DE-AC05-84OR21400

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title = "Synthesis and neutron powder diffraction study of the superconductor HgBa2Ca2Cu3O8 + δ by Tl substitution",

abstract = "Substitution of Tl for Hg was performed in the Hg based 1223 phase HgBa2Ca2Cu3O8 + δ (Tc = 135 K), resulting in an increase of the superconducting transition temperature to 138 K for samples with a nominal composition of Hg0.8Tl0.2Ba2Ca2Cu3O8 + δ. The crystal structure of this solid solution has been investigated by neutron powder diffraction techniques at room temperature and at 10 K. The compound has the same crystal as Hg-1223 with the space group symmetry P4/mmm and lattice parameters a = 3.8489(1), c = 15.816(1) A ̊. Rietveld analysis results indicate that Hg is partially replaced by Tl, and the oxygen content, δ, is 0.33. The lattice-parameter changes resulting from the Tl substitution are too small to account for the Tc change by mimicking the effect of pressure. No phase transition occurs down to 10 K.",

author = "P. Dai and Chakoumakos, {B. C.} and Sun, {G. F.} and Wong, {K. W.} and Y. Xin and Lu, {D. F.}",

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T1 - Synthesis and neutron powder diffraction study of the superconductor HgBa2Ca2Cu3O8 + δ by Tl substitution

AU - Dai, P.

AU - Chakoumakos, B. C.

AU - Sun, G. F.

AU - Wong, K. W.

AU - Xin, Y.

AU - Lu, D. F.

PY - 1995/3/1

Y1 - 1995/3/1

N2 - Substitution of Tl for Hg was performed in the Hg based 1223 phase HgBa2Ca2Cu3O8 + δ (Tc = 135 K), resulting in an increase of the superconducting transition temperature to 138 K for samples with a nominal composition of Hg0.8Tl0.2Ba2Ca2Cu3O8 + δ. The crystal structure of this solid solution has been investigated by neutron powder diffraction techniques at room temperature and at 10 K. The compound has the same crystal as Hg-1223 with the space group symmetry P4/mmm and lattice parameters a = 3.8489(1), c = 15.816(1) A ̊. Rietveld analysis results indicate that Hg is partially replaced by Tl, and the oxygen content, δ, is 0.33. The lattice-parameter changes resulting from the Tl substitution are too small to account for the Tc change by mimicking the effect of pressure. No phase transition occurs down to 10 K.

AB - Substitution of Tl for Hg was performed in the Hg based 1223 phase HgBa2Ca2Cu3O8 + δ (Tc = 135 K), resulting in an increase of the superconducting transition temperature to 138 K for samples with a nominal composition of Hg0.8Tl0.2Ba2Ca2Cu3O8 + δ. The crystal structure of this solid solution has been investigated by neutron powder diffraction techniques at room temperature and at 10 K. The compound has the same crystal as Hg-1223 with the space group symmetry P4/mmm and lattice parameters a = 3.8489(1), c = 15.816(1) A ̊. Rietveld analysis results indicate that Hg is partially replaced by Tl, and the oxygen content, δ, is 0.33. The lattice-parameter changes resulting from the Tl substitution are too small to account for the Tc change by mimicking the effect of pressure. No phase transition occurs down to 10 K.

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ER -

Synthesis and neutron powder diffraction study of the superconductor HgBa₂Ca₂Cu₃O_{8 + δ} by Tl substitution

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