Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 112, Issue 1, Pages 60-64Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1412638112
Keywords
pressure; isotope; superconductivity; quantum effects; lithium
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Funding
- National Science Foundation-Division of Materials Research Grant [1351986]
- University of Utah Undergraduate Research Opportunities Program fund
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1351986] Funding Source: National Science Foundation
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We measured the superconducting transition temperature of Li-6 between 16 and 26 GPa, and report the lightest system to exhibit superconductivity to date. The superconducting phase diagram of 6Li is compared with that of Li-7 through simultaneous measurement in a diamond anvil cell (DAC). Below 21 GPa, Li exhibits a direct (the superconducting coefficient, alpha, Tc proportional to M-alpha, is positive), but unusually large isotope effect, whereas between 21 and 26 GPa, lithium shows an inverse superconducting isotope effect. The unusual dependence of the superconducting phase diagram of lithium on its atomic mass opens up the question of whether the lattice quantum dynamic effects dominate the low-temperature properties of dense lithium.
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