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Search Results: Records 1-20 displayed on this page of 26

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Journal Articles

Clear reduction in spin susceptibility and superconducting spin rotation for $$H||a$$ in the early-stage sample of spin-triplet superconductor UTe$$_2$$

Kitagawa, Shunsaku*; Tokunaga, Yo; Sakai, Hironori; Kambe, Shinsaku; 11 of others*

Journal of the Physical Society of Japan, 93(12), p.123701_1 - 123701_5, 2024/11

https://doi.org/10.7566/JPSJ.93.123701
 Times Cited Count：5 Percentile：69.84(Physics, Multidisciplinary)

Journal Articles

Longitudinal spin fluctuations driving field-reinforced superconductivity in UTe$$_2$$

Tokunaga, Yo; Sakai, Hironori; Kambe, Shinsaku; Opletal, P.; Tokiwa, Yoshifumi; Haga, Yoshinori; Kitagawa, Shunsaku*; Ishida, Kenji*; Aoki, Dai*; Knebel, G.*; et al.

Physical Review Letters, 131(22), p.226503_1 - 226503_7, 2023/12

https://doi.org/10.1103/PhysRevLett.131.226503
 Times Cited Count：14 Percentile：88.36(Physics, Multidisciplinary)

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：17 Percentile：91.14(Multidisciplinary Sciences)

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：52 Percentile：98.45(Physics, Multidisciplinary)

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：8 Percentile：76.79(Physics, Multidisciplinary)

Journal Articles

Physics of spin-triplet superconductivity in uranium compounds studied by NMR

Tokunaga, Yo; Sakai, Hironori; Kitagawa, Shunsaku*; Ishida, Kenji*

Nihon Butsuri Gakkai-Shi, 78(5), p.267 - 272, 2023/04

https://doi.org/10.11316/butsuri.78.5_267

no abstracts in English

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：27 Percentile：92.34(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：11 Percentile：67.51(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：54 Percentile：97.33(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：27 Percentile：91.70(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：31 Percentile：87.94(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：54 Percentile：93.68(Materials Science, Multidisciplinary)

Journal Articles

Superconducting properties of heavy fermion UTe$$_2$$ revealed by $$^{125}$$Te-nuclear magnetic resonance

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

https://doi.org/10.7566/JPSJ.88.113703
 Times Cited Count：93 Percentile：95.96(Physics, Multidisciplinary)

Journal Articles

$$^{125}$$Te-NMR study on a single crystal of heavy fermion superconductor UTe$$_2$$

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

https://doi.org/10.7566/JPSJ.88.073701
 Times Cited Count：78 Percentile：94.89(Physics, Multidisciplinary)

We report $$^{125}$$Te-NMR studies on a newly discovered heavy fermion superconductor UTe$$_2$$. Using a single crystal, we have measured the $$^{125}$$Te-NMR Knight shift $$K$$ and spin-lattice relaxation rate $$1/T_1$$ for fields along the three orthorhombic crystal axes. The data confirm a moderate Ising anisotropy for both the static ($$K$$) and dynamical susceptibilities ($$1/T_1$$) 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 $$1/T_2$$, when the field is applied along the easy axis of magnetization (=$$a$$ axis). This behavior suggests the development of longitudinal magnetic fluctuations along the $$a$$ axis at very low frequencies below 20 K.

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

NQR/NMR study under uniaxial stress in URu$$_{2}$$Si$$_{2}$$

Kambe, Shinsaku; Haga, Yoshinori; Sakai, Hironori; Ishitobi, Takayuki; Tokunaga, Yo; Matsumura, Hiroki*; Kitagawa, Shunsaku*; Ishida, Kenji*; Harima, Hisatomo*

no journal, , 

Let us consider the hidden order of URu$$_{2}$$Si$$_{2}$$. Recent studies have shown that the electronic state symmetry of hidden ordered states is limited to a few space groups. However, it remains 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 reduced by external fields such as uniaxial pressure. In this study, we will discuss Ru-NQR and Si-NMR when applying uniaxial pressure in the [100] and [110] directions to form orthorhombic crystals based on group theory.

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 $$H|a$$.

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

High-field NMR study of field-reinforced superconductivity in spin-triplet superconductors

Tokunaga, Yo; Sakai, Hironori; Kambe, Shinsaku; Opletal, P.; Tokiwa, Yoshifumi; Haga, Yoshinori; Kitagawa, Shunsaku*; Ishida, Kenji*; Aoki, Dai*; Knebel, G.*; 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.

26 (Records 1-20 displayed on this page)