Journal
PHYSICAL REVIEW LETTERS
Volume 91, Issue 16, Pages -Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.91.167001
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The dependence of the superconducting transition temperature T-c on nearly hydrostatic pressure has been determined to 67 GPa in an ac susceptibility measurement for a Li sample embedded in helium pressure medium. With increasing pressure, superconductivity appears at 5.47 K for 20.3 GPa, T-c rising rapidly to similar to14 K at 30 GPa. The T-c(P) dependence to 67 GPa differs significantly from that observed in previous studies where no pressure medium was used. Evidence is given that superconductivity in Li competes with symmetry breaking structural phase transitions which occur near 20, 30, and 62 GPa. In the pressure range 20-30 GPa, T-c is found to decrease rapidly in a dc magnetic field, the first evidence that Li is a type I superconductor.
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