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Tokunaga, Yo; Aoki, Dai*; Mayaffre, H.*; Krmer, S.*; Julien, M.-H.*; Berthier, C.*; Horvati
, M.*; Sakai, Hironori; Hattori, Taisuke; Kambe, Shinsaku; et al.
Physical Review B, 93(20), p.201112_1 - 201112_5, 2016/05
Times Cited Count:13 Percentile:58.47(Materials Science, Multidisciplinary)The ferromagnetic superconductor URhGe has been known to exhibit an extremely large enhancement of the upper critical field when the field is confined and rotated in the () crystal plane. Our high-field
Co NMR measurements on 10% Co-doped URhGe up to 30 T prove that this unconventional behavior of the superconductivity (SC) is associated with a strong anisotropy of field-dependent quantum fluctuations near a tricritical point. These fluctuations are rapidly suppressed by the field component along the
axis, while being unaffected by any field component along the
axis. The observed close interplay between the SC and quantum fluctuations strongly supports a pairing mechanism mediated by these fluctuations in URhGe.
Tokunaga, Yo; Aoki, Dai*; Mayaffre, H.*; Krmer, S.*; Julien, M.-H.*; Berthier, C.*; Horvati
, M.*; Sakai, Hironori; Kambe, Shinsaku; Araki, Shingo*
Physical Review Letters, 114(21), p.216401_1 - 216401_5, 2015/05
Times Cited Count:46 Percentile:90.47(Physics, Multidisciplinary)Our measurements of the Co NMR spin-spin relaxation in URh
Co
Ge reveal a divergence of electronic spin fluctuations in the vicinity of the field-induced quantum critical point at
T, around which reentrant superconductivity (RSC) occurs in the ferromagnetic heavy fermion compound URhGe. We show that critical fluctuations develop in the same limited region near the field
as that where RSC is observed. This strongly suggests these quantum fluctuations as the pairing glue responsible for the RSC. The fluctuations observed are characteristic of a tricritical point.
Araki, Shingo*; Hayashida, Minami*; Nishiumi, Naoto*; Manabe, Hiroki*; Ikeda, Yoichi*; Kobayashi, Tatsuo*; Murata, Keizo*; Inada, Yoshihiko*; Winiewski, P.*; Aoki, Dai*; et al.
Journal of the Physical Society of Japan, 84(2), p.024705_1 - 024705_8, 2015/02
Times Cited Count:8 Percentile:56.39(Physics, Multidisciplinary)Araki, Shingo*; Hayashida, Minami*; Nishiumi, Naoto*; Manabe, Hiroki*; Ikeda, Yoichi*; Kobayashi, Tatsuo*; Murata, Keizo*; Inada, Yoshihiko*; Winiewski, P.*; Aoki, Dai*; et al.
JPS Conference Proceedings (Internet), 3, p.011081_1 - 011081_6, 2014/06
Hieu, N. V.*; Takeuchi, Tetsuya*; Shishido, Hiroaki*; Tonohiro, Chie*; Yamada, Tsutomu*; Nakashima, Hiroshi*; Sugiyama, Kiyohiro*; Settai, Rikio*; Matsuda, Tatsuma; Haga, Yoshinori; et al.
Journal of the Physical Society of Japan, 76(6), p.064702_1 - 064702_16, 2007/06
Times Cited Count:43 Percentile:83.33(Physics, Multidisciplinary)kawasaki, Shinji*; Yashima, Mitsuharu*; kotegawa, Yu*; Mito, Takeshi*; Kawasaki, Yu*; Zheng, G.-Q.*; Kitaoka, Yoshio*; Shishido, Hiroaki*; Araki, Shingo*; Aoki, Dai*; et al.
Journal of Physics and Chemistry of Solids, 67(1-3), p.497 - 499, 2006/01
Times Cited Count:2 Percentile:13.36(Chemistry, Multidisciplinary)We report the novel phase diagram of superconductivity (SC) and antiferromagnetism (AFM) in heavy-fermion (HF) pressure ()-induced superconductors CeRhIn
and CeIn
through nuclear-quadrupole-resonance (NQR) measurements under
. The
-induced superconductivity in CeRhIn
coexists with AFM on a microscopic level in 1.5-1.9 GPa. By contrast, in CeIn
, the
-induced phase separation of AFM and paramagnetism (PM) takes place without any trace of a quantum phase transition. The outstanding finding is that SC sets in at both the phasesmagnetically separated into AFM and PM in 2.28-2.5 GPa.
Hieu, N. V.*; Shishido, Hiroaki*; Thamizhavel, A.*; Settai, Rikio*; Araki, Shingo*; Nozue, Yasuo*; Matsuda, Tatsuma; Haga, Yoshinori; Takeuchi, Tetsuya*; Harima, Hisatomo*; et al.
Journal of the Physical Society of Japan, 74(12), p.3320 - 3328, 2005/12
Times Cited Count:13 Percentile:60.24(Physics, Multidisciplinary)We grew single crystals of PrCoIn, PrRhIn
, and PrIrIn
with the tetragonal crystal structure and measured the electrical resistivity, specific heat, magnetic susceptibility, magnetization and de Haas-van Alphen effect. These Pr compounds reveal no magnetic ordering. The topology of the Fermi surfaces is the same as that of a non-4 f reference compound LaRhIn
. The cyclotron mass and/or the electronic specific heat coefficient are also approximately the same as those of LaRhIn
. The magnetic susceptibility and magnetization are anisotropic, reflecting the crystal structure, which are well explained by the tetragonal crystalline electric field scheme with the singlet ground state.
Kuwahara, Keitaro*; Iwasa, Kazuaki*; Kogi, Masafumi*; Kaneko, Koji; Araki, Shingo; Metoki, Naoto; Sugawara, Hitoshi*; Aoki, Yuji*; Sato, Hideyuki*
Journal of the Physical Society of Japan, 73(6), p.1438 - 1441, 2004/06
Times Cited Count:64 Percentile:87.95(Physics, Multidisciplinary)no abstracts in English
Metoki, Naoto; Kaneko, Koji; Araki, Shingo; Kogi, Masafumi*; Iwasa, Kazuaki*; Kuwahara, Keitaro*; Bernhoeft, N.*; Mignot, J.-M.*; Gukasov, A.*; Sato, Hideyuki*; et al.
Journal of Magnetism and Magnetic Materials, 272-276(Suppl.), p.e91 - e92, 2004/05
Times Cited Count:1 Percentile:7.34(Materials Science, Multidisciplinary)no abstracts in English
Araki, Shingo; Metoki, Naoto; Thamizhavel, A.*; Onuki, Yoshichika
Journal of Physics; Condensed Matter, 15(23), p.S2179 - S2182, 2003/07
no abstracts in English
Metoki, Naoto; Koike, Yoshihiro; Haga, Yoshinori; Kaneko, Koji; Araki, Shingo; McEwen, K. A.*; Kogi, Masafumi*; Aso, Naofumi*; Lander, G. H.; Komatsubara, Takemi*; et al.
Journal of Physics; Condensed Matter, 15(28), p.S1957 - S1963, 2003/07
Times Cited Count:2 Percentile:15.5(Physics, Condensed Matter)no abstracts in English
Araki, Shingo; Metoki, Naoto; Galatanu, A.; Yamamoto, Etsuji; Thamizhavel, A.*; Onuki, Yoshichika
Physical Review B, 68(2), p.024408_1 - 024408_9, 2003/07
Times Cited Count:42 Percentile:83.97(Materials Science, Multidisciplinary)no abstracts in English
Kogi, Masafumi*; Iwasa, Kazuaki*; Nakajima, Motoki*; Metoki, Naoto; Araki, Shingo; Bernhoeft, N.*; Mignot, J.-M.*; Gukasov, A.*; Sato, Hideyuki*; Aoki, Yuji*; et al.
Journal of the Physical Society of Japan, 72(5), p.1002 - 1005, 2003/05
Times Cited Count:196 Percentile:97.39(Physics, Multidisciplinary)no abstracts in English
Araki, Shingo; Nakashima, Miho*; Settai, Rikio*; Kobayashi, Tatsuo*; Onuki, Yoshichika
Acta Physica Polonica B, 34(2, Part1), p.439 - 442, 2003/02
no abstracts in English
Homma, Tetsuo; Yamamoto, Etsuji; Haga, Yoshinori; Settai, Rikio*; Araki, Shingo*; Inada, Yoshihiko*; Takeuchi, Tetsuya*; Kuwahara, Keitaro*; Amitsuka, Hiroshi*; Sakakibara, T.*; et al.
Physica B; Condensed Matter, 281-282, p.195 - 196, 2000/06
Times Cited Count:2 Percentile:16(Physics, Condensed Matter)no abstracts in English
Haga, Yoshinori; Yamamoto, Etsuji; Homma, Tetsuo*; Nakamura, Akio; *; Araki, Shingo*; Okuni, H.*; Onuki, Yoshichika*
Physica B; Condensed Matter, 259-261, p.627 - 628, 1999/00
Times Cited Count:17 Percentile:67.09(Physics, Condensed Matter)no abstracts in English
Tokunaga, Yo; Aoki, Dai*; Mayaffre, H.*; Krmer, S.*; Julien, M.-H.*; Berthier, C.*; Horvati
, M.*; Hattori, Taisuke; Sakai, Hironori; Kambe, Shinsaku; et al.
no journal, ,
no abstracts in English
Tokunaga, Yo; Aoki, Dai*; Mayaffre, H.*; Krmer, S.*; Julien, M.-H.*; Berthier, C.*; Horvati
, M.*; Hattori, Taisuke; Sakai, Hironori; Kambe, Shinsaku; et al.
no journal, ,
no abstracts in English
Tokunaga, Yo; Aoki, Dai*; Mayaffre, H.*; Krmer, S.*; Julien, M.-H.*; Berthier, C.*; Horvati
, M.*; Sakai, Hironori; Hattori, Taisuke; Kambe, Shinsaku; et al.
no journal, ,
Ferromagnetism is incompatible in general with superconductivity (SC) with singlet spin pairs, since a strong exchange field in ferromagnetic state forces the spin pairs to align in the same direction. In contrast, fluctuation of ferromagnetic moments has been supposed to create a binding force between quasi-particles with triplet spin. Such an unconventional spin-triplet state, mediated by ferromagnetic fluctuations, is now expected to be realized in a family of uranium based compounds, UGe, URhGe and UCoGe, so far the only fully established examples of ferromagnetic superconductors in which uniform SC is realized deep inside the ferromagnetic states. To elucidate the mechanism of this exotic SC, we have prepared a URhGe single crystal and performed nuclear magnetic resonance (NMR) experiments.