Superconductivity in multiple phases of compressed GeSb2Te4
| Autor: | G. Kh. Rozenberg, Alexander Palevski, M. Karpovski, Yuri Rosenberg, Samar Layek, Irina Pozin, E. Sterer, Victor Shelukhin, Bar Hen, Eran Greenberg, Moshe P. Pasternak, Yoram Dagan, Roee Friedman |
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| Rok vydání: | 2017 |
| Předmět: |
Quantum phase transition
Physics Superconductivity Condensed matter physics Material system 02 engineering and technology Crystal structure 021001 nanoscience & nanotechnology 01 natural sciences Amorphous solid Electrical transport Condensed Matter::Superconductivity 0103 physical sciences Superconducting critical temperature 010306 general physics 0210 nano-technology Electronic properties |
| Zdroj: | Physical Review B. 95 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.95.064514 |
| Popis: | Here we report the discovery of superconductivity in multiple phases of the compressed $\mathrm{GeS}{\mathrm{b}}_{2}\mathrm{T}{\mathrm{e}}_{4}$ (GST) phase change memory alloy, which has attracted considerable attention for the last decade due to its unusual physical properties with many potential applications. Superconductivity is observed through electrical transport measurements, both for the amorphous $(a$-GST) and for the crystalline $(c$-GST) phases. The superconducting critical temperature ${T}_{c}$ continuously increases with applied pressure, reaching a maximum ${T}_{c}=6\phantom{\rule{0.16em}{0ex}}\mathrm{K}$ at $P=20\phantom{\rule{0.16em}{0ex}}\mathrm{GPa}$ for $a$-GST, whereas the critical temperature of the cubic phase reaches a maximum ${T}_{c}=8\phantom{\rule{0.16em}{0ex}}\mathrm{K}$ at 30 GPa. This material system, exhibiting a superconductor-insulator quantum phase transition, has an advantage over disordered metals since it has a continuous control of the crystal structure and the electronic properties using pressure as an external stimulus. |
| Databáze: | OpenAIRE |
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