Impurity effect on superconducting gap and pseudogap

H. Ichikawa; Y. Kobayashi; T. Sakuraba; H. Shibata; A. Matsuda

doi:10.1016/j.physc.2009.05.180

Impurity effect on superconducting gap and pseudogap

H. Ichikawa^*, Y. Kobayashi, T. Sakuraba, H. Shibata, A. Matsuda

^*Corresponding author for this work

School of Advanced Science and Engineering

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

6 Citations (Scopus)

Abstract

Co substituted Bi2212 samples of Bi_2.1Sr_1.9Ca(Cu_1-xCo_x)O_8+δ (x = 0, 0.01, 0.02, 0.04, 0.06, and Tc = 85,71,52,35 K) were prepared, and their electronic density states were characterized by a low temperature STM. The experimental results revealed that superconducting gap-like features were rapidly destroyed, while pseudogap-like features were enhanced with increasing impurities, suggesting that the origin of the pseudogap is different from that of a superconducting gap. We suggested a two phase-like model to explain the behavior of a gap map and a gap distribution function. On the other hand, spatial gap and pseudogap inhomogeneity persisted in all Co concentrations. This indicates that the origin of inhomogeneity is not related to in-plane disorder or impurities.

Original language	English
Pages (from-to)	1013-1015
Number of pages	3
Journal	Physica C: Superconductivity and its applications
Volume	469
Issue number	15-20
DOIs	https://doi.org/10.1016/j.physc.2009.05.180
Publication status	Published - 2009 Oct 15

Keywords

Copper oxide superconductor
High-Tc
STM

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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10.1016/j.physc.2009.05.180

Cite this

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title = "Impurity effect on superconducting gap and pseudogap",

abstract = "Co substituted Bi2212 samples of Bi2.1Sr1.9Ca(Cu1-xCox)O8+δ (x = 0, 0.01, 0.02, 0.04, 0.06, and Tc = 85,71,52,35 K) were prepared, and their electronic density states were characterized by a low temperature STM. The experimental results revealed that superconducting gap-like features were rapidly destroyed, while pseudogap-like features were enhanced with increasing impurities, suggesting that the origin of the pseudogap is different from that of a superconducting gap. We suggested a two phase-like model to explain the behavior of a gap map and a gap distribution function. On the other hand, spatial gap and pseudogap inhomogeneity persisted in all Co concentrations. This indicates that the origin of inhomogeneity is not related to in-plane disorder or impurities.",

keywords = "Copper oxide superconductor, High-Tc, STM",

author = "H. Ichikawa and Y. Kobayashi and T. Sakuraba and H. Shibata and A. Matsuda",

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doi = "10.1016/j.physc.2009.05.180",

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

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TY - JOUR

T1 - Impurity effect on superconducting gap and pseudogap

AU - Ichikawa, H.

AU - Kobayashi, Y.

AU - Sakuraba, T.

AU - Shibata, H.

AU - Matsuda, A.

PY - 2009/10/15

Y1 - 2009/10/15

N2 - Co substituted Bi2212 samples of Bi2.1Sr1.9Ca(Cu1-xCox)O8+δ (x = 0, 0.01, 0.02, 0.04, 0.06, and Tc = 85,71,52,35 K) were prepared, and their electronic density states were characterized by a low temperature STM. The experimental results revealed that superconducting gap-like features were rapidly destroyed, while pseudogap-like features were enhanced with increasing impurities, suggesting that the origin of the pseudogap is different from that of a superconducting gap. We suggested a two phase-like model to explain the behavior of a gap map and a gap distribution function. On the other hand, spatial gap and pseudogap inhomogeneity persisted in all Co concentrations. This indicates that the origin of inhomogeneity is not related to in-plane disorder or impurities.

AB - Co substituted Bi2212 samples of Bi2.1Sr1.9Ca(Cu1-xCox)O8+δ (x = 0, 0.01, 0.02, 0.04, 0.06, and Tc = 85,71,52,35 K) were prepared, and their electronic density states were characterized by a low temperature STM. The experimental results revealed that superconducting gap-like features were rapidly destroyed, while pseudogap-like features were enhanced with increasing impurities, suggesting that the origin of the pseudogap is different from that of a superconducting gap. We suggested a two phase-like model to explain the behavior of a gap map and a gap distribution function. On the other hand, spatial gap and pseudogap inhomogeneity persisted in all Co concentrations. This indicates that the origin of inhomogeneity is not related to in-plane disorder or impurities.

KW - Copper oxide superconductor

KW - High-Tc

KW - STM

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Impurity effect on superconducting gap and pseudogap

Abstract

Keywords

ASJC Scopus subject areas

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