Superconductivity in multiple phases of compressed GeSb2Te4

Here we report the discovery of superconductivity in multiple phases of the compressed GeSb2Te4 (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 throu...

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Bibliographic Details
Published in:arXiv.org 2016-05
Main Authors: Greenberg, E, Hen, B, Layek, Samar, Pozin, I, Friedman, R, Shelukhin, V, Rosenberg, Y, Karpovski, M, Pasternak, M P, Sterer, E, Dagan, Y, G Kh Rozenberg, Palevski, A
Format: Article
Language:English
Subjects:
Computer memory
Crystal structure
External pressure
Phase transitions
Phases
Physical properties
Superconductivity
Transition temperature
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Summary:Here we report the discovery of superconductivity in multiple phases of the compressed GeSb2Te4 (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, TC, continuously increases with the applied pressure reaching a maximum Tc =6K at P=20 GPa for a-GST, whereas the critical temperature of the cubic phase reaches a maximum Tc =8 K at 30 GPa. This new material system, exhibiting a superconductor-insulator quantum phase transition (SIT) 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, which was lacking in SIT studies until today.
ISSN:2331-8422
DOI:10.48550/arxiv.1605.01757