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Sakai, Hironori; Opletal, P.; Tokiwa, Yoshifumi; Yamamoto, Etsuji; Tokunaga, Yo; Kambe, Shinsaku; Haga, Yoshinori
no journal, ,
The superconducting transition temperature 
in the spin-triplet superconductor UTe increases from the initial reported value of 1.6 K to 2.0 K as the newly reported one improving the growth condition. We have developed a growth method for the superconductor UTe that is different from the usual chemical vapor phase transport method. As a result, we have succeeded in growing high-purity UTe crystals at 
=2.1 K and confirmed that the residual specific heat below is very low and the residual ratio of electrical resistance is very large. We report the optimization of the newly developed method for UTe.
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phase diagram of spin-triplet superconducting UTeSakai, Hironori
no journal, ,
We have developed a single crystal growth method for UTe, which is attracting attention as a spin-triplet superconductor. With optimized growth conditions, the residual resistivity ratio has been significantly improved, in addition to an increase in superconducting transition temperature. The phase diagram of magnetic field ()-temperature () up to a high magnetic field of 25 T has been determined by simultaneous measurement of electrical resistivity and AC susceptibility using a high-quality single crystal grown by this method.