Pressure-induced Superconductivity in Elemental Materials

Both experimental and theoretical approaches in our search for superconductivity under pressure are reviewed. We have developed a double extreme condition of very low-temperature down to 50 mK using a 3He/4He dilution refrigerator and ultrahigh pressure up to 200 GPa using a diamond-anvil cell (DAC)...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2005-05, Vol.74 (5), p.1345-1357
Main Authors: SHIMIZU, Katsuya, AMAYA, Kiichi, SUZUKI, Naoshi
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Physics
Pressure effects
Superconductivity
Transition temperature variations
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Summary:Both experimental and theoretical approaches in our search for superconductivity under pressure are reviewed. We have developed a double extreme condition of very low-temperature down to 50 mK using a 3He/4He dilution refrigerator and ultrahigh pressure up to 200 GPa using a diamond-anvil cell (DAC). Experimental techniques producing ultrahigh pressure as well as measuring electrical resistance, magnetization and optical response are developed especially for studying the pressure-induced superconductivity of simple systems such as elemental materials. The details of these techniques are described in §1. In §2, we review several examples of pressure-induced superconductivity observed for the first time by our group. Comparisons between experimental results and theories based on the first principles band calculations are given in §3. Finally, we point out remaining problems to be solved in further studies in the search for pressure-induced superconductivity.
ISSN:0031-9015
1347-4073
DOI:10.1143/jpsj.74.1345