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Journal Articles

Superconducting spin reorientation in spin-triplet multiple superconducting phases of UTe$$_2$$

Kinjo, Katsuki*; Fujibayashi, Hiroki*; Matsumura, Hiroki*; Hori, Fumiya*; Kitagawa, Shunsaku*; Ishida, Kenji*; Tokunaga, Yo; Sakai, Hironori; Kambe, Shinsaku; Nakamura, Ai*; et al.

Science Advances (Internet), 9(30), p.2736_1 - 2736_6, 2023/07

https://doi.org/10.1126/sciadv.adg2736
 Times Cited Count：14 Percentile：88.25(Multidisciplinary Sciences)

Journal Articles

Low-temperature magnetic fluctuations investigated by $$^{125}$$Te-NMR on the uranium-based superconductor UTe$$_2$$

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

https://doi.org/10.7566/JPSJ.92.053702
 Times Cited Count：7 Percentile：77.36(Physics, Multidisciplinary)

Journal Articles

Large reduction in the $$a$$-axis knight shift on UTe$$_2$$ with $$T_c$$ = 2.1 K

Matsumura, Hiroki*; Fujibayashi, Hiroki*; 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, 92(6), p.063701_1 - 063701_5, 2023/05

https://doi.org/10.7566/JPSJ.92.063701
 Times Cited Count：36 Percentile：98.12(Physics, Multidisciplinary)

Journal Articles

Change of superconducting character in UTe$$_{2}$$ induced by magnetic field

Kinjo, Katsuki*; Fujibayashi, Hiroki*; Kitagawa, Shunsaku*; Ishida, Kenji*; Tokunaga, Yo; Sakai, Hironori; Kambe, Shinsaku; Nakamura, Ai*; Shimizu, Yusei*; Homma, Yoshiya*; et al.

Physical Review B, 107(6), p.L060502_1 - L060502_5, 2023/02

https://doi.org/10.1103/PhysRevB.107.L060502
 Times Cited Count：21 Percentile：92.66(Materials Science, Multidisciplinary)

Journal Articles

Drastic change in magnetic anisotropy of UTe$$_2$$ under pressure revealed by $$^{125}$$Te-NMR

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

https://doi.org/10.1103/PhysRevB.105.L140502
 Times Cited Count：9 Percentile：63.91(Materials Science, Multidisciplinary)

Journal Articles

Superconducting order parameter in UTe$$_2$$ determined by knight shift measurement

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

https://doi.org/10.7566/JPSJ.91.043705
 Times Cited Count：46 Percentile：97.07(Physics, Multidisciplinary)

This study investigates the spin susceptibility in U-based superconductor UTe$$_2$$ in the superconducting (SC) state by using Knight shift measurements for a magnetic field $$H$$ along the $$a$$ axis, which is the magnetic easy axis of UTe$$_2$$. Although a tiny anomaly ascribed to the SC diamagnetic effect was observed just below the SC transition temperature $$T_{rm c}$$, the $$a$$-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 $$T_{rm c}$$. Considering the previous Knight shift results for $$Hparallel b$$ and $$Hparallel c$$, the dominant SC state is determined to be $$B_{3u}$$ in the spin-triplet pairing, which is consistent with the spin anisotropy in the normal state. The present result shows that UTe$$_2$$ is a spin-triplet superconductor with spin degrees of freedom.

Journal Articles

Slow electronic dynamics in the paramagnetic state of UTe$$_2$$

Tokunaga, Yo; Sakai, Hironori; Kambe, Shinsaku; Haga, Yoshinori; Tokiwa, Yoshifumi; Opletal, P.; Fujibayashi, Hiroki*; Kinjo, Katsuki*; Kitagawa, Shunsaku*; Ishida, Kenji*; et al.

Journal of the Physical Society of Japan, 91(2), p.023707_1 - 023707_5, 2022/02

https://doi.org/10.7566/JPSJ.91.023707
 Times Cited Count：25 Percentile：91.89(Physics, Multidisciplinary)

$$^{125}$$Te NMR experiments in field ($$H$$) applied along the easy magnetization axis (the $$a$$-axis) revealed slow electronic dynamics developing in the paramagnetic state of UTe$$_2$$. The observed slow fluctuations are concerned with a successive growth of long-range electronic correlations below 30$$-$$40 K, where the spin susceptibility along the hard magnetization axis (the $$b$$-axis) shows a broad maximum. The experiments also imply that tiny amounts of disorder or defects locally disturb the long-range electronic correlations and develop an inhomogeneous electronic state at low temperatures, leading to a low temperature upturn observed in the bulk-susceptibility in $$H|a$$. We suggest that UTe$$_2$$ would be located on the paramagnetic side near an electronic phase boundary, where either the magnetic or Fermi-surface instability would be the origin of the characteristic fluctuations.

Journal Articles

Inhomogeneous superconducting state probed by $$^{125}$$Te NMR on UTe$$_2$$

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

https://doi.org/10.7566/JPSJ.90.064709
 Times Cited Count：27 Percentile：87.29(Physics, Multidisciplinary)

Journal Articles

Anisotropic response of spin susceptibility in the superconducting state of UTe$$_2$$ probed with $$^{125}$$Te-NMR measurement

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

https://doi.org/10.1103/PhysRevB.103.L100503
 Times Cited Count：49 Percentile：93.16(Materials Science, Multidisciplinary)

Oral presentation

Restriction on hidden order parameter from local symmetry at Ru site under uni-axial stress in URu$$_{2}$$Si$$_{2}$$

Kambe, Shinsaku; Sakai, Hironori; Haga, Yoshinori; Tokunaga, Yo; Kinjo, Katsuki*; Kitagawa, Shunsaku*; Ishida, Kenji*; Harima, Hisatomo*

no journal, , 

In this study, the local symmetry of Ru site is determined in the hidden order state under uni-axial stress along the [100] and [110] directions [4], by means of precise Ru-NQR measurements. These measurements again support the 4-fold symmetry at Ru site in the hidden order state without uni-axial stress. Furthermore, certain cases can be excluded from the previously proposed possible ones.

Oral presentation

Ru-NQR under uni-axial stress in URu$$_{2}$$Si$$_{2}$$

Kambe, Shinsaku; Sakai, Hironori; Tokunaga, Yo; Haga, Yoshinori; Kinjo, Katsuki*; Kitagawa, Shunsaku*; Ishida, Kenji*; Harima, Hisatomo*

no journal, , 

Consider the hidden order of URu$$_{2}$$Si$$_{2}$$. Recent studies have limited the electronic state symmetry of hidden ordered states to some space groups. However, it is still difficult to distinguish because it has the same high symmetry. Therefore, it is necessary to see how the symmetry of the hidden ordered state is lowered by the external field such as uniaxial pressure. In this study, we discuss Ru-NQR when the uniaxial pressure is applied in the [100] direction to form an orthorhombic crystal.

Oral presentation

Slow dynamics of electrons in the paramagnetic state of UTe$$_2$$

Tokunaga, Yo; Sakai, Hironori; Kambe, Shinsaku; Haga, Yoshinori; Tokiwa, Yoshifumi; Opletal, P.; Fujibayashi, Hiroki*; Kinjo, Katsuki*; Kitagawa, Shunsaku*; Ishida, Kenji*; et al.

no journal, , 

Oral presentation

Ru-NQR in URu$$_{2}$$Si$$_{2}$$ under uniaxial stress, 2

Kambe, Shinsaku; Haga, Yoshinori; Sakai, Hironori; Tokunaga, Yo; Kinjo, Katsuki*; Kitagawa, Shunsaku*; Ishida, Kenji*; Harima, Hisatomo*

no journal, , 

Consider the hidden order of URu$$_{2}$$Si$$_{2}$$. Recent studies have shown that the electronic state symmetry of hidden ordered states is restricted to a few space groups. However, since they have the same high symmetry, their distinction remains difficult. Therefore, it is necessary to see how external fields such as uniaxial pressure lower the symmetry of hidden ordered states. In this study, we discuss the Ru-NQR when the uniaxial pressure is applied to the [100] and [110] directions to form orthorhombic crystals.

Oral presentation

Electronic fluctuations in the normal state of UTe$$_2$$

Tokunaga, Yo; Sakai, Hironori; Kambe, Shinsaku; Opletal, P.; Tokiwa, Yoshifumi; Haga, Yoshinori; Fujibayashi, Hiroki*; Kinjo, Katsuki*; Kitagawa, Shunsaku*; Ishida, Kenji*; et al.

no journal, , 

We report the results of $$^{125}$$Te NMR measurements in field ($$H$$) applied along the easy magnetization axis (the $$a$$-axis). The experiments revealed slow electronic dynamics developing in the paramagnetic state of UTe$$_2$$. The observed slow fluctuations are concerned with a successive growth of long-range electronic correlations below 30$$-$$40 K, where the spin susceptibility along the hard magnetization axis (the $$b$$-axis) shows a broad maximum. The experiments also imply that tiny amounts of disorder or defects locally disturb the long-range electronic correlations and develop an inhomogeneous electronic state at low temperatures, leading to a low temperature upturn observed in the bulk-susceptibility in $$H|a$$.

14 (Records 1-14 displayed on this page)
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