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Fujibayashi, Hiroki*; Kinjo, Katsuki*; Nakamine, Genki*; Kitagawa, Shunsaku*; Ishida, Kenji*; Tokunaga, Yo; Sakai, Hironori; Kambe, Shinsaku; Nakamura, Ai*; Shimizu, Yusei*; et al.
Journal of the Physical Society of Japan, 92(5), p.053702_1 - 053702_5, 2023/05
Times Cited Count:8 Percentile:75.89(Physics, Multidisciplinary)Kinjo, Katsuki*; Fujibayashi, Hiroki*; Nakamine, Genki*; Kitagawa, Shunsaku*; Ishida, Kenji*; Tokunaga, Yo; Sakai, Hironori; Kambe, Shinsaku; Nakamura, Ai*; Shimizu, Yusei*; et al.
Physical Review B, 105(14), p.L140502_1 - L140502_5, 2022/04
Times Cited Count:11 Percentile:62.63(Materials Science, Multidisciplinary)Fujibayashi, Hiroki*; Nakamine, Genki*; Kinjo, Katsuki*; Kitagawa, Shunsaku*; Ishida, Kenji*; Tokunaga, Yo; Sakai, Hironori; Kambe, Shinsaku; Nakamura, Ai*; Shimizu, Yusei*; et al.
Journal of the Physical Society of Japan, 91(4), p.043705_1 - 043705_4, 2022/03
Times Cited Count:51 Percentile:97.09(Physics, Multidisciplinary)This study investigates the spin susceptibility in U-based superconductor UTe in the superconducting (SC) state by using Knight shift measurements for a magnetic field
along the
axis, which is the magnetic easy axis of UTe
. Although a tiny anomaly ascribed to the SC diamagnetic effect was observed just below the SC transition temperature
, the
-axis Knight shift in the SC state shows no significant decrease, following the extrapolation from the normal-state temperature dependence. This indicates that the spin susceptibility is nearly unchanged below
. Considering the previous Knight shift results for
and
, the dominant SC state is determined to be
in the spin-triplet pairing, which is consistent with the spin anisotropy in the normal state. The present result shows that UTe
is a spin-triplet superconductor with spin degrees of freedom.
Nakamine, Genki*; Kinjo, Katsuki*; Kitagawa, Shunsaku*; Ishida, Kenji*; Tokunaga, Yo; Sakai, Hironori; Kambe, Shinsaku; Nakamura, Ai*; Shimizu, Yusei*; Homma, Yoshiya*; et al.
Journal of the Physical Society of Japan, 90(6), p.064709_1 - 064709_7, 2021/06
Times Cited Count:29 Percentile:86.89(Physics, Multidisciplinary)Nakamine, Genki*; Kinjo, Katsuki*; Kitagawa, Shunsaku*; Ishida, Kenji*; Tokunaga, Yo; Sakai, Hironori; Kambe, Shinsaku; Nakamura, Ai*; Shimizu, Yusei*; Homma, Yoshiya*; et al.
Physical Review B, 103(10), p.L100503_1 - L100503_5, 2021/03
Times Cited Count:52 Percentile:93.31(Materials Science, Multidisciplinary)Nakamine, Genki*; Kitagawa, Shunsaku*; Ishida, Kenji*; Tokunaga, Yo; Sakai, Hironori; Kambe, Shinsaku; Nakamura, Ai*; Shimizu, Yusei*; Homma, Yoshiya*; Li, D.*; et al.
Journal of the Physical Society of Japan, 88(11), p.113703_1 - 113703_4, 2019/11
Times Cited Count:91 Percentile:95.91(Physics, Multidisciplinary)Tokunaga, Yo; Sakai, Hironori; Kambe, Shinsaku; Hattori, Taisuke; Higa, Nonoka; Nakamine, Genki*; Kitagawa, Shunsaku*; Ishida, Kenji*; Nakamura, Ai*; Shimizu, Yusei*; et al.
Journal of the Physical Society of Japan, 88(7), p.073701_1 - 073701_4, 2019/07
Times Cited Count:78 Percentile:94.84(Physics, Multidisciplinary)We report Te-NMR studies on a newly discovered heavy fermion superconductor UTe
. Using a single crystal, we have measured the
Te-NMR Knight shift
and spin-lattice relaxation rate
for fields along the three orthorhombic crystal axes. The data confirm a moderate Ising anisotropy for both the static (
) and dynamical susceptibilities (
) in the paramagnetic state above about 20 K. Around 20 K, however, we have observed a sudden loss of NMR spin-echo signal due to sudden enhancement of the NMR spin-spin relaxation rate
, when the field is applied along the easy axis of magnetization (=
axis). This behavior suggests the development of longitudinal magnetic fluctuations along the
axis at very low frequencies below 20 K.
Tokunaga, Yo; Sakai, Hironori; Kambe, Shinsaku; Hattori, Taisuke; Higa, Nonoka*; Nakamine, Genki*; Kitagawa, Shunsaku*; Ishida, Kenji*; Nakamura, Ai*; Shimizu, Yusei*; et al.
no journal, ,
Recently, Ran et al. reported evidence for superconductivity in the uranium-based heavy fermion material UTe, exhibiting the rather high transition temperature of 1.6 K. The ground state of UTe
is paramagnetic, not ferromagnetic. However, the compound still exhibits a very large and anisotropic upper critical field H
, exceeding the Pauli limit along the three principal axes, similar to the ferromagnetic superconductors, UCoGe and URhGe. Field-induced metamagnetic transition and re-entrant superconducting behaviour have been reported under strong magnetic fields around 35 T, when a magnetic field was applied along the orthorhombic hard-magnetization b-axis. In this study, we have performed Te-NMR measurements on a newly discovered heavy fermion superconductor UTe
. Our NMR data confirm a moderate Ising anisotropy for both the static (K) and dynamical susceptibilities (1/
) in the paramagnetic state above about 20 K.
Tokunaga, Yo; Sakai, Hironori; Kambe, Shinsaku; Hattori, Taisuke; Higa, Nonoka*; Nakamine, Genki*; Kitagawa, Shunsaku*; Ishida, Kenji*; Nakamura, Ai*; Shimizu, Yusei*; et al.
no journal, ,
Te NMR studies have been performed on a newly discovered heavy fermion superconductor UTe
.Using a single crystal, we have measured the
Te NMR Knight shift
and spin-lattice relaxation rate
for fields along the three orthorhombic crystal axes. The data confirm a moderate Ising anisotropy for both the static (
) and dynamical susceptibilities (
) in the paramagnetic state above about 20 K. Around 20 K, however, we have observed a sudden loss of NMR spin-echo signal due to sudden enhancement of the NMR spin-spin relaxation rate
, when the field is applied along the easy axis of magnetization (=
axis).