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Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride

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Pressure-induced superconductivity in CaLi(2).

T Matsuoka¹, M Debessai, J J Hamlin

¹Department of Physics, Washington University, St Louis, MO 63130, USA.

Physical Review Letters

|June 4, 2008

Summary

This summary is machine-generated.

Superconductivity was investigated in calcium lithium (CaLi2) under high pressure. Bulk superconductivity was discovered at temperatures up to 13 K, with resistivity increasing significantly with pressure.

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Area of Science:

Condensed Matter Physics
Materials Science
High-Pressure Physics

Background:

Laves-phase CaLi2 was theoretically predicted to exhibit unusual properties under pressure.
Previous studies did not report superconductivity in CaLi2 at ambient conditions.

Purpose of the Study:

To investigate the superconducting properties of hexagonal Laves-phase CaLi2.
To explore the effects of high pressure on CaLi2's electronic behavior.

Main Methods:

Experimental search for superconductivity using ac susceptibility and electrical resistivity measurements.
Application of pressures up to 81 GPa.

Main Results:

No superconductivity was detected above 1.10 K at ambient pressure.
Bulk superconductivity was observed in CaLi2 at temperatures reaching 13 K under high pressure.
A significant increase in normal-state resistivity with increasing pressure was recorded.

Conclusions:

High pressure induces bulk superconductivity in CaLi2.
The pressure dependence of resistivity suggests complex electronic interactions in CaLi2 under extreme conditions.