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Journal Articles

Observation of longitudinal magnetic fluctuations at a first-order ferromagnetic quantum phase transition in UGe$$_2$$

Noma, Yuichiro*; Kotegawa, Hisashi*; Kubo, Tetsuro*; To, Hideki*; Harima, Hisatomo*; Haga, Yoshinori; Yamamoto, Etsuji; Onuki, Yoshichika*; Ito, Kohei*; Nakamura, Ai*; et al.

Journal of the Physical Society of Japan, 90(7), p.073707_1 - 073707_5, 2021/07

 Times Cited Count:0 Percentile:0(Physics, Multidisciplinary)

Journal Articles

Evidence for weak spin-orbit interaction experienced by Cooper pairs in the spin-triplet superconductor UPt$$_3$$; $$^{195}$$Pt-NMR study

Aoyama, Taisuke*; Kotegawa, Hisashi*; Kimura, Noriaki*; Yamamoto, Etsuji; Haga, Yoshinori; Onuki, Yoshichika*; To, Hideki*

Journal of the Physical Society of Japan, 88(6), p.064706_1 - 064706_7, 2019/06

 Times Cited Count:0 Percentile:0(Physics, Multidisciplinary)

Journal Articles

Anisotropic magnetic fluctuations in ferromagnetic superconductor UGe$$_2$$; $$^{73}$$Ge-NQR study at ambient pressure

Noma, Yuichiro*; Kotegawa, Hisashi*; Kubo, Tetsuro*; To, Hideki*; Harima, Hisatomo*; Haga, Yoshinori; Yamamoto, Etsuji; Onuki, Yoshichika*; Ito, Kohei*; Haller, E. E.*; et al.

Journal of the Physical Society of Japan, 87(3), p.033704_1 - 033704_5, 2018/03

 Times Cited Count:4 Percentile:47.76(Physics, Multidisciplinary)

Journal Articles

Pressure evolution of the metamagnetic transition in UCoAl As measured using $$^{59}$$Co NMR

Kotegawa, Hisashi*; Nohara, Hiroki*; To, Hideki*; Matsuda, Tatsuma; Yamamoto, Etsuji; Haga, Yoshinori; Fisk, Z.; Onuki, Yoshichika; Aoki, Dai*; Flouquet, J.*

Journal of the Korean Physical Society, 63(3), p.341 - 344, 2013/08

 Times Cited Count:1 Percentile:12.72(Physics, Multidisciplinary)

Journal Articles

Field-induced phenomena in ferromagnetic superconductors UCoGe and URhGe

Aoki, Dai*; Taupin, M.*; Paulsen, C.*; Hardy, F.*; Taufour, V.*; Kotegawa, Hisashi*; Hassinger, E.*; Malone, L.*; Matsuda, Tatsuma; Miyake, Atsushi*; et al.

Journal of the Physical Society of Japan, 81(Suppl.B), p.SB002_1 - SB002_6, 2012/12

 Times Cited Count:3 Percentile:28.92(Physics, Multidisciplinary)

Journal Articles

Ferromagnetic quantum critical endpoint in UCoAl

Aoki, Dai*; Combier, T.*; Taufour, V.*; Matsuda, Tatsuma; Knebel, G.*; Kotegawa, Hisashi*; Flouquet, J.*

Journal of the Physical Society of Japan, 80(9), p.094711_1 - 094711_10, 2011/09

 Times Cited Count:71 Percentile:92.29(Physics, Multidisciplinary)

Journal Articles

Strong longitudinal magnetic fluctuations near critical end point in UCoAl; A $$^{59}$$Co-NMR study

Nohara, Hiroki*; Kotegawa, Hisashi*; To, Hideki*; Matsuda, Tatsuma; Yamamoto, Etsuji; Haga, Yoshinori; Fisk, Z.; Onuki, Yoshichika; Aoki, Dai*; Flouquet, J.*

Journal of the Physical Society of Japan, 80(9), p.093707_1 - 093707_4, 2011/09

 Times Cited Count:17 Percentile:70.46(Physics, Multidisciplinary)

Journal Articles

$$^9$$Be-NMR spin-lattice relaxation rate in heavy-fermion superconductor UBe$$_{13}$$

Morita, Kyohei*; Hara, Yudai*; Sakano, Junya*; Kotegawa, Hisashi*; To, Hideki*; Haga, Yoshinori; Onuki, Yoshichika

Journal of the Physical Society of Japan, 80(Suppl.A), p.SA099_1 - SA099_3, 2011/07

 Times Cited Count:1 Percentile:12.07(Physics, Multidisciplinary)

Journal Articles

Muon spin rotation study of magnetism in multilayer HgBa$$_2$$Ca$$_4$$Cu$$_5$$O$$_y$$ superconductor

Tokiwa, Kazuyasu*; Mikusu, Satoshi*; Higemoto, Wataru; Nishiyama, Kusuo*; Iyo, Akira*; Tanaka, Yasumoto*; Kotegawa, Hisashi*; Mukuda, Hidekazu*; Kitaoka, Yoshio*; Watanabe, Tsuneo*

Physica C, 460-462(2), p.892 - 895, 2007/09

 Times Cited Count:3 Percentile:18.97(Physics, Applied)

Zero- and longitudinal-field muon-spin rotation (ZF-$$mu$$SR and LF-$$mu$$SR) measurements were carried out on a multi-layered HgBa$$_2$$Ca$$_4$$Cu$$_5$$O$$_y$$ (Hg-1245) superconductor with $$T$$$$_{rm c}$$ of 108 K. With decreasing temperature, the observed ZF-$$mu$$SR function changed from a Gaussian-type to an exponential-type below 60 K and zero field muon precession was also observed below 45 K. These $$mu$$SR signals are attributed to the development of the antiferromagnetic ordering in inner CuO$$_2$$planes with a low carrier concentration. These results seem to indicate clear evidence that antiferromagnetism microscopically coexists with superconductivity in the Hg-1245 superconductor below 60 K.

Journal Articles

High-quality single crystal growth and physical properties in a ferromagnet UIr

Yamamoto, Etsuji; Haga, Yoshinori; Ikeda, Shugo; Matsuda, Tatsuma; Akazawa, Teruhiko*; Kotegawa, Hisashi*; Kobayashi, Tatsuo*; Onuki, Yoshichika*

Journal of Magnetism and Magnetic Materials, 310(2, Part1), p.e123 - e125, 2007/03

no abstracts in English

Journal Articles

Cooperative phenomenon of ferromagnetism and unconventional superconductivity in UGe$$_2$$; A $$^{73}$$Ge-NQR study under pressure

Harada, Atsuyuki*; Kawasaki, Shinji*; Kotegawa, Hisashi*; Kitaoka, Yoshio*; Haga, Yoshinori; Yamamoto, Etsuji; Onuki, Yoshichika; Ito, Kohei*; Haller, E. E.*; Harima, Hisatomo*

Journal of the Physical Society of Japan, 74(10), p.2675 - 2678, 2005/10

 Times Cited Count:20 Percentile:69.81(Physics, Multidisciplinary)

no abstracts in English

Oral presentation

Magnetic anisotropy and transport properties of URhSi

Matsuda, Tatsuma; Aoki, Dai*; Kotegawa, Hisashi*; Hassinger, E.*; Taufour, V.*; Knebel, G.*; Braithwaite, D.*; Salce, B.*; Yamamoto, Etsuji; Haga, Yoshinori; et al.

no journal, , 

no abstracts in English

Oral presentation

NMR study of Zn- and Ni-substitution effect in heavy fermion superconductor CeCoIn$$_5$$

Sakai, Hironori; Tokunaga, Yo; Haga, Yoshinori; Kambe, Shinsaku; Zhu, J.-X.*; Ronning, F.*; Ramakrishna, S. K.*; Reyes, A. P.*; Kotegawa, Hisashi*; To, Hideki*; et al.

no journal, , 

In heavy fermion superconductor CeCoIn$$_5$$, slight Zn substitutions for In atoms induce antiferromagnetism, while slight Ni substitutions for Co atoms suppress superconductivity. The both substituted CeCoIn$$_5$$ exhibit non- fermi-liquid behaviors near the phase boundaries which have been detected by magnetization and specific heat measurements. We have performed NMR experiments in these systems to investigate the microscopic effects by substituents. We will discuss about the spin fluctuations near the boundaries by NMR relaxation rates.

Oral presentation

NMR study of Ni-substitution effect in heavy fermion superconductor CeCoIn$$_5$$

Sakai, Hironori; Tokunaga, Yo; Haga, Yoshinori; Kambe, Shinsaku; Zhu, J.-X.*; Ronning, F.*; Kotegawa, Hisashi*; To, Hideki*; Suzuki, Kohei*; Oshima, Yoshiki*; et al.

no journal, , 

The Ni-substitutions of Co in the heavy fermion superconductor CeCoIn$$_5$$ are reported to suppress the superconductivity by Yokoyama et al. in Ibaraki Univ. To microscopically investigate the Ni doping effect, we have performed NMR study in the alloy system of Ce(Co, Ni)In$$_5$$. We would like to discuss the spin fluctuations and the electronic state near the critical composition for the superconductivity in this system.

Oral presentation

Microscopic study of Ni and Zn substitution effects in heavy fermion superconductor CeCoIn$$_5$$

Sakai, Hironori; Tokunaga, Yo; Haga, Yoshinori; Kambe, Shinsaku; Ronning, F.*; Zhu, J.-X.*; Thompson, J. D.*; Kotegawa, Hisashi*; To, Hideki*; Suzuki, Kohei*; et al.

no journal, , 

Heavy fermion superconductor CeCoIn$$_5$$ is considered as a quantum critical antiferromagnetic material. When the In elements are slightly substituted by Zn elements, a long-range antiferromagnetism is induced. On the other hand, slight Sn substitutions make the system step away from the quantum critical point. In the case of Zn substitutions, heterogeneity of antiferromagnetic area in the matrix of heavy fermion state has been microscopically confirmed by NQR measurements. In the case of Ni substitutions for the Co elements, the NQR result appears to be the same as in Sn substituted system.

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