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Science 28 August 1998:
Vol. 281. no. 5381, pp. 1333 - 1335
DOI: 10.1126/science.281.5381.1333
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Reports

Metallic CsI at Pressures of up to 220 Gigapascals

M. I. Eremets, * K. Shimizu, T. C. Kobayashi, K. Amaya dagger

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.

M. I. Eremets and T. C. Kobayashi, Research Center for Materials Science at Extreme Conditions, Osaka University, Toyonaka, Osaka 560-8531, Japan. K. Shimizu, Department of Physical Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan. K. Amaya, Department of Physical Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan, and Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Nakagun, Ibaragi 319-1195, Japan.
*   On leave from Institute of Spectroscopy, Academy of Sciences of Russia, and Center for Superhard Materials, Ministry of Science, 142092, Troitsk, Moscow Region, Russia.

dagger    To whom correspondence should be addressed.

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