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High-pressure superconducting phase diagram of 6Li: isotope effects in dense lithium.

Abstract：

:We measured the superconducting transition temperature of (6)Li between 16 and 26 GPa, and report the lightest system to exhibit superconductivity to date. The superconducting phase diagram of (6)Li is compared with that of (7)Li through simultaneous measurement in a diamond anvil cell (DAC). Below 21 GPa, Li exhibits a direct (the superconducting coefficient, α, T(c) proportional M(-α), 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.

journal_name

Proc Natl Acad Sci U S A

journal_title

Proceedings of the National Academy of Sciences of the United States of America

authors

Schaeffer AM,Temple SR,Bishop JK,Deemyad S

doi

10.1073/pnas.1412638112

subject

Has Abstract

pub_date

2015-01-06 00:00:00

pages

60-4

issue

1

eissn

0027-8424

issn

1091-6490

pii

1412638112

journal_volume

112

pub_type

杂志文章

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