Single crystal growth of superconducting UTe2 by molten salt flux method
H. Sakai, P. Opletal, Y. Tokiwa, E. Yamamoto, Y. Tokunaga, S. Kambe, Y. Haga
DOI 10.1103/PhysRevMaterials.6.073401 · Physical Review Materials
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Abstract
The molten salt flux method is applied as a synthetic route for the single crystals of the spin-triplet superconductor UTe2. The single crystals under an optimized growth condition with excess uranium exhibit a superconducting transition at Tc=2.1K, which is the highest Tc reported for this compound. The obtained crystals show a remarkably large residual resistivity ratio with respect to the room temperature value and a small residual electronic contribution in specific heat well below Tc. These results indicate that the increase of Tc in UTe2 can be achieved by reducing the disorder associated with uranium vacancies. The excess uranium in the molten salt acts as a reducing agent, preventing tetravalent uranium from becoming pentavalent and suppressing creation of uranium vacancies. At the same time, the relatively low growth temperature can suppress Te volatilization.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| UTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.1 | Pressure unresolved | onset |
| UTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.6 | Pressure unresolved | onset |
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