Superconducting gap of heavily underdoped copper oxide superconductor (Bi,Pb) 2 Sr 2 (Ca,Y)Cu 2 O 8+δ
| Autor: | Hideki Sakamoto, Shik Shin, Takeshi Kondo, Tsunehiro Takeuchi, Masaharu Matsunami, Hiroshi Ikuta |
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| Rok vydání: | 2017 |
| Předmět: |
Copper oxide
Materials science Mineralogy Angle-resolved photoemission spectroscopy 02 engineering and technology 01 natural sciences law.invention chemistry.chemical_compound law Condensed Matter::Superconductivity 0103 physical sciences Physical and Theoretical Chemistry 010306 general physics Spectroscopy Superconductivity Radiation Condensed matter physics Doping 021001 nanoscience & nanotechnology Condensed Matter Physics Laser Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials chemistry Condensed Matter::Strongly Correlated Electrons Slow Growth Rate 0210 nano-technology Pseudogap |
| Zdroj: | Journal of Electron Spectroscopy and Related Phenomena. 220:54-57 |
| ISSN: | 0368-2048 |
| DOI: | 10.1016/j.elspec.2017.01.007 |
| Popis: | The heavily underdoped (Bi,Pb)2Sr2(Ca,Y)Cu2O8+δ single crystals were successfully grown by conventional floating zone technique with a very slow growth rate of 0.20 mm/h. The superconducting gap of prepared single crystals was investigated by means of laser induced ARPES measurement. We found that the superconducting gap was kept almost unchanged from optimally doped region, Tc = 92 K, to heavily underdoped region, Tc ∼ 12 K. The result suggest that the pair-formation-energy in underdoped region is similar to that in optimally doped region, and the superconducting temperature is presumably suppressed by the pseudogap which increase with decreasing hole concentration. |
| Databáze: | OpenAIRE |
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