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Journal Articles

Interplay between quantum fluctuations and reentrant superconductivity with a highly enhanced upper critical field in URhGe

Tokunaga, Yo; Aoki, Dai*; Mayaffre, H.*; Kr$"a$mer, S.*; Julien, M.-H.*; Berthier, C.*; Horvati$'c$, 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 ($$ab$$) crystal plane. Our high-field $$^{59}$$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 $$c$$ axis, while being unaffected by any field component along the $$a$$ axis. The observed close interplay between the SC and quantum fluctuations strongly supports a pairing mechanism mediated by these fluctuations in URhGe.

Journal Articles

Reentrant superconductivity driven by quantum tricritical fluctuations in URhGe; Evidence from $$^{59}$$Co NMR in URh$$_{0.9}$$Co$$_{0.1}$$Ge

Tokunaga, Yo; Aoki, Dai*; Mayaffre, H.*; Kr$"a$mer, S.*; Julien, M.-H.*; Berthier, C.*; Horvati$'c$, 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 $$^{59}$$Co NMR spin-spin relaxation in URh$$_{0.9}$$Co$$_{0.1}$$Ge reveal a divergence of electronic spin fluctuations in the vicinity of the field-induced quantum critical point at $$H_Rapprox13$$ 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 $$H_R$$ 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.

Journal Articles

Pressure-temperature-field phase diagram in the ferromagnet U$$_3$$P$$_4$$

Araki, Shingo*; Hayashida, Minami*; Nishiumi, Naoto*; Manabe, Hiroki*; Ikeda, Yoichi*; Kobayashi, Tatsuo*; Murata, Keizo*; Inada, Yoshihiko*; Wi$'s$niewski, 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)

Journal Articles

Metamagnetic transition of itinerant ferromagnet U$$_3$$P$$_4$$ under high pressure

Araki, Shingo*; Hayashida, Minami*; Nishiumi, Naoto*; Manabe, Hiroki*; Ikeda, Yoichi*; Kobayashi, Tatsuo*; Murata, Keizo*; Inada, Yoshihiko*; Wi$'s$niewski, P.*; Aoki, Dai*; et al.

JPS Conference Proceedings (Internet), 3, p.011081_1 - 011081_6, 2014/06

Journal Articles

Magnetic properties and crystalline electric field scheme in RRhIn$$_5$$ (R: Rare earth)

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)

Journal Articles

$$^{115}$$In-NQR study of antiferromagnetism and superconductivity in CeRhIn$$_5$$ and CeIn$$_3$$ under pressure

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 ($$P$$)-induced superconductors CeRhIn$$_5$$ and CeIn$$_3$$ through nuclear-quadrupole-resonance (NQR) measurements under $$P$$. The $$P$$-induced superconductivity in CeRhIn$$_5$$ coexists with AFM on a microscopic level in 1.5-1.9 GPa. By contrast, in CeIn$$_3$$, the $$P$$-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.

Journal Articles

Fermi surface and magnetic properties of PrTIn$$_5$$ (T: Co, Rh, and Ir)

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$$_5$$, PrRhIn$$_5$$, and PrIrIn$$_5$$ 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$$_5$$. The cyclotron mass and/or the electronic specific heat coefficient are also approximately the same as those of LaRhIn$$_5$$. 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.

Journal Articles

Magnetic excitations in heavy-fermion superconductor PrOs$$_{4}$$Sb$$_{12}$$

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

Journal Articles

Neutron scattering study on the field-induced antiferro-quadrupolar ordering in the heavy fermion superconductor PrOs$$_{4}$$Sb$$_{12}$$

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

Journal Articles

Crystalline electric field excitations in CeAgSb$$_{2}$$

Araki, Shingo; Metoki, Naoto; Thamizhavel, A.*; Onuki, Yoshichika

Journal of Physics; Condensed Matter, 15(23), p.S2179 - S2182, 2003/07

no abstracts in English

Journal Articles

Higher-order collinear interaction and magnetic excitation in the 5f localized system U$$_{3}$$Pd$$_{20}$$Si$$_{6}$$

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

Journal Articles

Crystal structure, magnetic ordering, and magnetic excitation in the 4${it f}$-localized ferromagnet CeAgSb$$_{2}$$

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

Journal Articles

Evidence for magnetic-field-induced quadrupolar ordering in the heavy-fermion superconductor PrOs$$_{4}$$Sb$$_{12}$$

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

Journal Articles

Superconductivity in CeRh$$_{2}$$Si$$_{2}$$ under pressure

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

Journal Articles

Magnetic, elastic, transport and fermi surface properties of a ferromagnetic compound UGa$$_{2}$$

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

Journal Articles

Anisotropic magnetoresistance in UBe$$_{13}$$

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

Oral presentation

NMR study on U(Rh$$_{1-x}$$Co$$_{x}$$)Ge, 3

Tokunaga, Yo; Aoki, Dai*; Mayaffre, H.*; Kr$"a$mer, S.*; Julien, M.-H.*; Berthier, C.*; Horvati$'c$, M.*; Hattori, Taisuke; Sakai, Hironori; Kambe, Shinsaku; et al.

no journal, , 

no abstracts in English

Oral presentation

NMR study on URhGe

Tokunaga, Yo; Aoki, Dai*; Mayaffre, H.*; Kr$"a$mer, S.*; Julien, M.-H.*; Berthier, C.*; Horvati$'c$, M.*; Hattori, Taisuke; Sakai, Hironori; Kambe, Shinsaku; et al.

no journal, , 

no abstracts in English

Oral presentation

NMR study on a single crystal of URhGe

Tokunaga, Yo; Aoki, Dai*; Mayaffre, H.*; Kr$"a$mer, S.*; Julien, M.-H.*; Berthier, C.*; Horvati$'c$, 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$$_2$$, 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.

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