Effect of Structural Disorder on the Superconductivity in Tl2Ba2Ca2Cu3O10

Guo Qing Zheng; Hayato Wakabayashi; Yoshio Kitaoka; Kunisuke Asayama; Kazuyuki Hamada; Hisao Yamauchi; Shoji Tanaka

doi:10.1143/JPSJ.66.1880

Effect of Structural Disorder on the Superconductivity in Tl₂Ba₂Ca₂Cu₃O₁₀

Guo Qing Zheng, Hayato Wakabayashi, Yoshio Kitaoka, Kunisuke Asayama, Kazuyuki Hamada, Hisao Yamauchi, Shoji Tanaka

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

5 Citations (Scopus)

Abstract

The ⁶³Cu spin-lattice relaxation rate has been measured in an annealed sample of Tl₂Ba₂Ca₂Cu₃O₁₀ with T_c = 123 K, and compared with that in the previously reported asgrown sample with T_c = 115 K. We found, for the first time, that T_c increases as a result of a decrease in the residual density of states (DOS), N_res, at the Fermi level due to the improvement of crystal ordering by annealing. Based on the T₁ result, N_res normalized by the value at T_c, N_res/N₀, was found to be reduced from 0.30 to 0.18 after annealing. A 2-dimensional d-wave superconductivity model accounts for the increase of T_c in terms of the change in potential scattering due to crystal imperfection, which is probably caused by Ca/Tl inter-substitution.

Original language	English
Pages (from-to)	1880-1883
Number of pages	4
Journal	journal of the physical society of japan
Volume	66
Issue number	7
DOIs	https://doi.org/10.1143/JPSJ.66.1880
Publication status	Published - Jul 1997
Externally published	Yes

Keywords

DOS
Disorder
High T
NMR
T
d-wave

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.66.1880

Cite this

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title = "Effect of Structural Disorder on the Superconductivity in Tl2Ba2Ca2Cu3O10",

abstract = "The 63Cu spin-lattice relaxation rate has been measured in an annealed sample of Tl2Ba2Ca2Cu3O10 with Tc = 123 K, and compared with that in the previously reported asgrown sample with Tc = 115 K. We found, for the first time, that Tc increases as a result of a decrease in the residual density of states (DOS), Nres, at the Fermi level due to the improvement of crystal ordering by annealing. Based on the T1 result, Nres normalized by the value at Tc, Nres/N0, was found to be reduced from 0.30 to 0.18 after annealing. A 2-dimensional d-wave superconductivity model accounts for the increase of Tc in terms of the change in potential scattering due to crystal imperfection, which is probably caused by Ca/Tl inter-substitution.",

keywords = "DOS, Disorder, High T, NMR, T, d-wave",

author = "Zheng, {Guo Qing} and Hayato Wakabayashi and Yoshio Kitaoka and Kunisuke Asayama and Kazuyuki Hamada and Hisao Yamauchi and Shoji Tanaka",

year = "1997",

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T1 - Effect of Structural Disorder on the Superconductivity in Tl2Ba2Ca2Cu3O10

AU - Zheng, Guo Qing

AU - Wakabayashi, Hayato

AU - Kitaoka, Yoshio

AU - Asayama, Kunisuke

AU - Hamada, Kazuyuki

AU - Yamauchi, Hisao

AU - Tanaka, Shoji

PY - 1997/7

Y1 - 1997/7

N2 - The 63Cu spin-lattice relaxation rate has been measured in an annealed sample of Tl2Ba2Ca2Cu3O10 with Tc = 123 K, and compared with that in the previously reported asgrown sample with Tc = 115 K. We found, for the first time, that Tc increases as a result of a decrease in the residual density of states (DOS), Nres, at the Fermi level due to the improvement of crystal ordering by annealing. Based on the T1 result, Nres normalized by the value at Tc, Nres/N0, was found to be reduced from 0.30 to 0.18 after annealing. A 2-dimensional d-wave superconductivity model accounts for the increase of Tc in terms of the change in potential scattering due to crystal imperfection, which is probably caused by Ca/Tl inter-substitution.

AB - The 63Cu spin-lattice relaxation rate has been measured in an annealed sample of Tl2Ba2Ca2Cu3O10 with Tc = 123 K, and compared with that in the previously reported asgrown sample with Tc = 115 K. We found, for the first time, that Tc increases as a result of a decrease in the residual density of states (DOS), Nres, at the Fermi level due to the improvement of crystal ordering by annealing. Based on the T1 result, Nres normalized by the value at Tc, Nres/N0, was found to be reduced from 0.30 to 0.18 after annealing. A 2-dimensional d-wave superconductivity model accounts for the increase of Tc in terms of the change in potential scattering due to crystal imperfection, which is probably caused by Ca/Tl inter-substitution.

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KW - Disorder

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KW - T

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