Metallic CsI at Pressures of up to 220 Gigapascals

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Science  28 Aug 1998:
Vol. 281, Issue 5381, pp. 1333-1335
DOI: 10.1126/science.281.5381.1333

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Direct electrical transport measurements in a diamond anvil cell provide evidence for the metallization of cesium iodide (CsI) at a pressure of 115 gigapascals. A drop in the temperature dependence of the resistance was found at pressures above 180 gigapascals, indicating that the CsI was superconductive. The superconductivity changed under the influence of a magnetic field to a lower critical temperature and disappeared above 0.3 tesla. The highest critical temperature at which superconductivity was observed was 2 kelvin, and the critical temperature decreased with increasing pressure.

  • * On leave from Institute of Spectroscopy, Academy of Sciences of Russia, and Center for Superhard Materials, Ministry of Science, 142092, Troitsk, Moscow Region, Russia.

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