Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
; Improvement of 
and multiple superconducting phase diagramSakai, Hironori; Haga, Yoshinori
Kotai Butsuri, 58(10), p.529 - 536, 2023/10
We have succeeded to grow high-quality UTe single crystals with excess uranium through molten salt flux method. We have also studied the superconducting phase diagram using the high-quality crystal applying the fields up to 25 T along the magnetic hard 
axis.
by molten salt flux methodSakai, Hironori; Opletal, P.; Tokiwa, Yoshifumi; Yamamoto, Etsuji; Tokunaga, Yo; Kambe, Shinsaku; Haga, Yoshinori
Physical Review Materials (Internet), 6(7), p.073401_1 - 073401_10, 2022/07
Times Cited Count：18 Percentile：89.58(Materials Science, Multidisciplinary)The molten salt flux method is applied as a new synthetic route for the single crystals of the spin-triplet superconductor UTe. The single crystals under an optimized growth condition with excess uranium exhibit a superconducting transition at 
K, which is the highest 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 . These results indicate that the increase of in UTe 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.
Shishido, Hiroaki*; Yamamoto, Etsuji; Haga, Yoshinori; Ikeda, Shugo; Nakashima, Miho*; Settai, Rikio*; Onuki, Yoshichika
Journal of the Physical Society of Japan, 75(Suppl.), p.119 - 120, 2006/08
Times Cited Count：1 Percentile：11.01(Physics, Multidisciplinary)no abstracts in English
Onuki, Yoshichika*; Yamamoto, Etsuji; Haga, Yoshinori; Kimura, Noriaki*
Genshiryoku Kogyo, 43(5), p.47 - 52, 1997/00
no abstracts in English
Sakai, Hironori
no journal, ,
I will present the recently developed method for growing high-quality single crystals of UTe and report the superconducting properties by these crystals.
revealed by high-quality single-crystalSakai, Hironori
no journal, ,
We have recently succeeded in growing ultra-clean single crystals of the novel superconductor UTe using the molten salt flux (MSF) method, which increases from 1.6 K to 2.1 K by suppressing impurity scattering. When a magnetic field is applied "precisely" in the magnetization-hard b-axis direction, a "field-enhanced superconducting state" appears, in which increases with the magnetic field above 15 T. To investigate this high-field superconducting (HFSC) phase, we attempted to determine the field-temperature phase diagram of ultra-pure single crystals up to 
25 T. With applying magnetic field along the -axis, the simultaneous measurements of 
and 
revealed an intermediate superconductivity between the low-field superconducting (LFSC) and HFSC phases above 15 T, previously hidden in the low-quality samples.
