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Superconductivity in compressed lithium at 20 K.

Katsuya Shimizu1, Hiroto Ishikawa, Daigoroh Takao

  • 1Department of Physical Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan. kshimizu@mp.es.osaka-u.ac.jp

Nature
|October 11, 2002
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Summary
This summary is machine-generated.

Lithium becomes superconducting at pressures above 30 GPa, reaching a transition temperature of 20 K. This finding supports theories predicting high-temperature superconductivity in light elements like metallic hydrogen.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • Superconductivity at high temperatures is theoretically predicted for light elements under extreme pressure.
  • Conventional BCS theory suggests elements with low atomic numbers may exhibit superconductivity.
  • Metallic hydrogen is predicted to be superconducting above room temperature at pressures exceeding 400 GPa.

Purpose of the Study:

  • To investigate superconductivity in lithium (Li) at lower pressures than previously studied.
  • To experimentally confirm or refute previous tentative observations of superconductivity in Li.
  • To provide evidence for the correlation between low atomic number and high superconducting transition temperatures.

Main Methods:

  • Applying high pressures (greater than 30 GPa) to lithium samples.
  • Measuring the electrical resistance of lithium under pressure to detect superconducting transitions.
  • Analyzing the pressure-dependent transition temperature (T(c)).

Main Results:

  • Lithium (Li) exhibits superconductivity at pressures greater than 30 GPa.
  • A pressure-dependent superconducting transition temperature (T(c)) was observed, reaching 20 K at 48 GPa.
  • This represents the highest confirmed T(c) for any element, validating earlier tentative findings.

Conclusions:

  • The study confirms that lithium becomes superconducting at accessible pressures.
  • The results support the hypothesis that light elements can achieve high superconducting transition temperatures.
  • The findings suggest that metallic hydrogen could indeed exhibit very high T(c) superconductivity.