| Autor: |
Pasan, Hiranya, Snider, Elliot, Munasinghe, Sasanka, Dissanayake, Sachith E., Salke, Nilesh P., Ahart, Muhtar, Khalvashi-Sutter, Nugzari, Dasenbrock-Gammon, Nathan, McBride, Raymond, Smith, G. Alexander, Mostafaeipour, Faraz, Smith, Dean, Cortés, Sergio Villa, Xiao, Yuming, Kenney-Benson, Curtis, Park, Changyong, Prakapenka, Vitali, Chariton, Stella, Lawler, Keith V., Somayazulu, Maddury, Liu, Zhenxian, Hemley, Russell J., Salamat, Ashkan, Dias, Ranga P. |
| Rok vydání: |
2023 |
| Předmět: |
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| Druh dokumentu: |
Working Paper |
| Popis: |
The phenomenon of high temperature superconductivity, approaching room temperature, has been realized in a number of hydrogen-dominant alloy systems under high pressure conditions1-12. A significant discovery in reaching room temperature superconductivity is the photo-induced reaction of sulfur, hydrogen, and carbon that initially forms of van der Waals solids at sub-megabar pressures. Carbonaceous sulfur hydride has been demonstrated to be tunable with respect to carbon content, leading to different superconducting final states with different structural symmetries. A modulated AC susceptibility technique adapted for a diamond anvil cell confirms a Tc of 260 kelvin at 133 GPa in carbonaceous sulfur hydride. Furthermore, direct synchrotron infrared reflectivity measurements on the same sample under the same conditions reveal a superconducting gap of ~85 meV at 100 K in close agreement to the expected value from Bardeen-Cooper-Schrieffer (BCS) theory13-18. Additionally, x-ray diffraction in tandem with AC magnetic susceptibility measurements above and below the superconducting transition temperature, and as a function of pressure at 107-133 GPa, reveal the Pnma structure of the material is responsible for the close to room-temperature superconductivity at these pressures. |
| Databáze: |
arXiv |
| Externí odkaz: |
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