High pressure effects revisited for the cuprate superconductor family with highest critical temperature
| Autor: | Yoshinori Tokura, C. Terakura, Ayako Yamamoto, Nao Takeshita |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Superconductivity
Multidisciplinary Materials science Condensed matter physics Doping General Physics and Astronomy Nanotechnology General Chemistry Pressure dependence General Biochemistry Genetics and Molecular Biology Article Cuprate superconductor Electrical resistivity and conductivity High pressure Superconducting critical temperature |
| Zdroj: | Nature Communications |
| ISSN: | 2041-1723 |
| Popis: | How to enhance the superconducting critical temperature (Tc) has been a primary issue since the discovery of superconductivity. The highest Tc reported so far is 166 K in HgBa2Ca2Cu3O8+δ (Hg1223) at high pressure of 23 GPa, as determined with the reduction onset, but not zero, of resistivity. To clarify the possible condition of the real maximum Tc, it is worth revisiting the effects of pressure on Tc in the highest Tc family. Here we report a systematic study of the pressure dependence of Tc in HgBa2CaCu2O6+δ (Hg1212) and Hg1223 with the doping level from underdoped to overdoped. The Tc with zero resistivity is probed with a cubic-anvil-type apparatus that can produce hydrostatic pressures. Variation, not only increase but also decrease, of Tc in Hg1212 and Hg1223 with pressure strongly depends on the initial doping levels. In particular, we confirm a maximum Tc of 153 K at 22 GPa in slightly underdoped Hg1223. Superconductivity, zero-resistance electrical transport, exists up to temperatures above 150 K in mercury-based cuprates under pressure. Here, the authors revisit the pressure dependence of the superconducting transition temperature in these materials and find a strong dependence on initial doping. |
| Databáze: | OpenAIRE |
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