Impurity effect on superconducting gap and pseudogap
| Autor: | Hiroyuki Shibata, Y. Kobayashi, Azusa Matsuda, T. Sakuraba, H. Ichikawa |
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| Rok vydání: | 2009 |
| Předmět: |
Superconductivity
Materials science Condensed matter physics Energy Engineering and Power Technology Electronic structure Condensed Matter Physics Electronic Optical and Magnetic Materials law.invention Distribution function Impurity law Cuprate Electrical and Electronic Engineering Scanning tunneling microscope Pseudogap Electronic density |
| Zdroj: | Physica C: Superconductivity. 469:1013-1015 |
| ISSN: | 0921-4534 |
| DOI: | 10.1016/j.physc.2009.05.180 |
| Popis: | Co substituted Bi2212 samples of Bi 2.1 Sr 1.9 Ca(Cu 1−x Co 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. |
| Databáze: | OpenAIRE |
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