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Journal Articles

Cycloidal magnetic ordering in noncentrosymmetric EuIrGe$$_3$$

Matsumura, Takeshi*; Tsukakoshi, Mitsuru*; Ueda, Yoshihisa*; Higa, Nonoka*; Nakao, Akiko*; Kaneko, Koji; Kakihana, Masashi*; Hedo, Masato*; Nakama, Takao*; Onuki, Yoshichika*

Journal of the Physical Society of Japan, 91(7), p.073703_1 - 073703_5, 2022/07

 Times Cited Count:3 Percentile:79.93(Physics, Multidisciplinary)

Journal Articles

Critical slowing-down and field-dependent paramagnetic fluctuations in the skyrmion host EuPtSi; $$mu$$SR and NMR studies

Higa, Nonoka*; Ito, Takashi; Yogi, Mamoru*; Hattori, Taisuke; Sakai, Hironori; Kambe, Shinsaku; Guguchia, Z.*; Higemoto, Wataru; Nakashima, Miho*; Homma, Yoshiya*; et al.

Physical Review B, 104(4), p.045145_1 - 045145_7, 2021/07

 Times Cited Count:0 Percentile:0(Materials Science, 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

 Times Cited Count:56 Percentile:94.67(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.

Journal Articles

High-field phase diagram of the heavy-fermion metal CeIn$$_3$$; Pulsed-field NMR study on single crystals up to 56 T

Tokunaga, Yo; Orlova, A.*; Bruyant, N.*; Aoki, Dai*; Mayaffre, H.*; Kr$"a$mer, S.*; Julien, M.-H.*; Berthier, C.*; Horvati$'c$, M.*; Higa, Nonoka; et al.

Physical Review B, 99(8), p.085142_1 - 085142_5, 2019/02

 Times Cited Count:5 Percentile:28.12(Materials Science, Multidisciplinary)

The heavy-fermion antiferromagnet CeIn$$_3$$ exhibits a field-induced anomaly associated with Fermi surface reconstruction at $$H^*sim$$ 45 T, well below the antiferromagnetic (AFM) critical field that exceeds 60 T. In order to explore the origin of this anomaly, we have measured $$^{115}$$In NMR spectra in pulsed magnetic fields up to 56 T using high-quality single crystals. To within experimental resolution, we do not detect any change in the NMR spectra that could suggest a modification in either the character of the hyperfine field or the electric field gradient at In sites through $$H^*$$. This strongly suggests that the 45 T anomaly cannot be simply ascribed to a field-induced change in the magnetic structure of the AFM state.

Journal Articles

Odd-parity electronic multipolar ordering in URu$$_2$$Si$$_2$$; Conclusions from Si and Ru NMR measurements

Kambe, Shinsaku; Tokunaga, Yo; Sakai, Hironori; Hattori, Taisuke; Higa, Nonoka; Matsuda, Tatsuma*; Haga, Yoshinori; Walstedt, R. E.*; Harima, Hisatomo*

Physical Review B, 97(23), p.235142_1 - 235142_10, 2018/06

AA2018-0180.pdf:1.09MB

 Times Cited Count:19 Percentile:69.2(Materials Science, Multidisciplinary)

Oral presentation

NMR study of Ce$$_3$$PtIn$$_11$$

Kambe, Shinsaku; Tokunaga, Yo; Sakai, Hironori; Hattori, Taisuke; Higa, Nonoka; Uhlirova, K.*; Custers, J.*

no journal, , 

In-NQR measurements of Ce$$_3$$PtIn$$_11$$ were made. We succeeded in identifying at least two of the four In sites. Temperature dependent measurement of the spin lattice relaxation time was carried out. In the superconducting state. There was a strong temperature dependence of the spin lattice relaxation time. Discuss superconducting symmetry.

Oral presentation

NQR/NMR study of Zn-doped CeCoIn$$_5$$

Sakai, Hironori; Hattori, Taisuke; Higa, Nonoka; Tokunaga, Yo; Kambe, Shinsaku; Ronning, F.*; Zhu, J.-X.*; Suzuki, Kohei*; Oshima, Yoshiki*; Yokoyama, Makoto*

no journal, , 

We have used Nuclear Quadrupole Resonance (NQR) to probe microscopically the response of prototypical quantum critical metal CeCoIn$$_5$$ to substitutions of small amounts of Cd or Zn for In. Such non-magnetic Cd or Zn substitutions induce a long range antiferromagnetism. In the case of Cd substitutions, approximately half of the Cd substituents induce local Ce moments in their close proximity, as observed by site-dependent longitudinal nuclear spin relaxation rates $$1/T_1$$. In the paramagnetic state, the values of $$1/T_1$$ at the main peak position are similar to those in the pure CeCoIn$$_5$$, while those are enhanced at the skirt position of spectrum. We will discuss about the heterogeneous electronic state realized in such a Zn substituted system and discuss about the coexistence of superconductivity with the antiferromagnetism, as well.

Oral presentation

$$^{33}$$S-NMR study in $$beta$$-US$$_2$$

Sakai, Hironori; Hattori, Taisuke; Higa, Nonoka; Tokunaga, Yo; Tateiwa, Naoyuki; Yamamoto, Etsuji; Haga, Yoshinori; Kambe, Shinsaku; Reyes, A. P.*; Bauer, E. D.*; et al.

no journal, , 

$$beta$$-US$$_2$$ is a paramagnetic narrow-gap semiconductor with the energy band gap of 90 K. A characteristic feature of $$beta$$-US$$_2$$ is the strong response of the electrical resistivity to magnetic field. On the other hand, ferromagnetism is easily induced by pressure of about 1 GPa. Consequently, it is considered to be close to a ferromagnetic instability. To elucidate microscopically this very sensitive electronic states to external fields, $$^{33}$$S-NMR study has been performed. We will show our recent $$^{33}$$S-NMR results and discuss the electronic states.

Oral presentation

NMR study of EuPtSi

Higa, Nonoka; Tokunaga, Yo; Hattori, Taisuke; Sakai, Hironori; Kambe, Shinsaku

no journal, , 

no abstracts in English

Oral presentation

$$^{33}$$S-NMR study for a narrow-gap semiconductor $$beta$$-US$$_2$$

Sakai, Hironori; Higa, Nonoka; Hattori, Taisuke; Tokunaga, Yo; Kambe, Shinsaku; Tateiwa, Naoyuki; Haga, Yoshinori; Rossa, P. F. S.*; Thompson, J. D.*; Ronning, F.*; et al.

no journal, , 

$$beta$$-US$$_2$$ is known as a narrow-gap semiconductor. The magnetoresistance in this compound is extremely large but anisotropic. To obtain microscopic view of the magnetism, we have carried on $$^{33}$$S-NMR study. We will discuss the magnetic properties in this system to show the recent NMR results.

Oral presentation

NMR study of antiferromagnetic superconductor Ce$$_3$$PtIn$$_11$$

Kambe, Shinsaku; Tokunaga, Yo; Sakai, Hironori; Hattori, Taisuke; Higa, Nonoka; Kratoch$'i$lov$'a$, M.*; Uhlirova, K.*; Custers, J.*

no journal, , 

no abstracts in English

Oral presentation

Magnetic fluctuations in strongly correlated $$f$$ electrons system URu$$_2$$Si$$_2$$ under high fields

Sakai, Hironori; Higa, Nonoka; Hattori, Taisuke; Tokunaga, Yo; Haga, Yoshinori; Kambe, Shinsaku; Goto, Takayuki*; Hirata, Michihiro*; Awaji, Satoshi*; Sasaki, Takahiko*

no journal, , 

We have performed $$^{29}$$Si nuclear magnetic resonance (NMR) experiments using single crystal of strongly correlated $$5f$$ electrons system URu$$_2$$Si$$_2$$ under high external field of about 24 T. The temperature dependence of NMR shift in the paramagnetic state varies with external fields. The temperature and field dependences of NMR shifts resembles those of magnetic susceptibility.

Oral presentation

NMR study of EuPtSi, 2

Higa, Nonoka; Tokunaga, Yo; Hattori, Taisuke; Sakai, Hironori; Kambe, Shinsaku

no journal, , 

no abstracts in English

Oral presentation

Sn-NMR study of successive phase transition in URhSn

Tokunaga, Yo; Shimizu, Yusei*; Maurya, A.*; Honda, Fuminori*; Nakamura, Ai*; Sato, Yoshiki*; Li, D.*; Homma, Yoshiya*; Aoki, Dai*; Higa, Nonoka; et al.

no journal, , 

Uranium-based compound URhS exhibits two successive phase transitions at 54 K and 18 K. The origin of the phase transition at 18 K has been known to be ferromagnetic ordering, while the origin of the transition at 54 K is still unknown. In this study, we have investigated the mechanism of the successive phase transitions in URhSn by using Sn-NMR.

Oral presentation

$$^{125}$$Te-NMR study of magnetic fluctuations in a newly discovered uranium-based 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.

no journal, , 

$$^{125}$$Te NMR studies have been performed 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).

Oral presentation

NMR study of magnetic spin fluctuations in UTe$$_2$$

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$$_2$$, exhibiting the rather high transition temperature of 1.6 K. The ground state of UTe$$_2$$ is paramagnetic, not ferromagnetic. However, the compound still exhibits a very large and anisotropic upper critical field H$$_{c2}$$, 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$$_2$$. Our NMR 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.

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