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Journal Articles

Spin excitations in hole-overdoped iron-based superconductors

Horigane, Kazumasa*; Kiho, Kunihiro*; Fujita, Kei*; Kajimoto, Ryoichi; Ikeuchi, Kazuhiko*; Ji, S.*; Akimitsu, Jun*; Lee, C. H.*

Scientific Reports (Internet), 6, p.33303_1 - 33303_6, 2016/09

 Times Cited Count:12 Percentile:63.37(Multidisciplinary Sciences)

Journal Articles

Science from the initial operation of HRC

Ito, Shinichi*; Yokoo, Tetsuya*; Masuda, Takatsugu*; Yoshizawa, Hideki*; Soda, Minoru*; Ikeda, Yoichi*; Ibuka, Soshi*; Kawana, Daichi*; Sato, Taku*; Nambu, Yusuke*; et al.

JPS Conference Proceedings (Internet), 8, p.034001_1 - 034001_6, 2015/09

Journal Articles

Momentum-resolved charge excitations in high-$$T$$$$_{rm c}$$ cuprates studied by resonant inelastic X-ray scattering

Ishii, Kenji; Hoesch, M.*; Inami, Toshiya; Kuzushita, Kaori*; Owada, Kenji; Tsubota, Masami; Murakami, Yoichi; Mizuki, Junichiro; Endo, Yasuo; Tsutsui, Kenji*; et al.

Journal of Physics and Chemistry of Solids, 69(12), p.3118 - 3124, 2008/12

 Times Cited Count:3 Percentile:18.3(Chemistry, Multidisciplinary)

Journal Articles

$$mu$$SR measurements on the vortex lattice of CaAlSi; Anisotropic response in magnetic penetration depth

Kuroiwa, Sogo*; Sato, Koki*; Koda, Akihiro*; Kadono, Ryosuke*; Oishi, Kazuki*; Higemoto, Wataru; Akimitsu, Jun*

Journal of Physics and Chemistry of Solids, 68(11), p.2124 - 2128, 2007/11

 Times Cited Count:3 Percentile:18.04(Chemistry, Multidisciplinary)

The vortex state defined by two characteristic length scales, magnetic penetration depth ($$lambda$$) and coherence length ($$xi$$), in a layered hexagonal superconductor CaAlSi was probed using muon spin rotation. From preliminary analysis using modified London model, we found that the in-plane $$lambda$$ increases with increasing magnetic field while inter-plane $$lambda$$ is almost independent of magnetic field. The presence of field-induced quasiparticle excitation manifested in the field dependence of $$lambda$$ suggests that CaAlSi has an anisotropic gap structure.

Journal Articles

Microscopic properties of vortex states in YB$$_6$$ probed by muon spin rotation

Kadono, Ryosuke*; Kuroiwa, Sogo*; Akimitsu, Jun*; Koda, Akihiro*; Oishi, Kazuki; Higemoto, Wataru; Otani, Shigeki*

Physical Review B, 76(9), p.094501_1 - 094501_11, 2007/09

 Times Cited Count:10 Percentile:47.33(Materials Science, Multidisciplinary)

Journal Articles

Magnetic field-induced quasiparticle excitation in Nb$$_3$$Sn; Evidence for anisotropic $$s$$-wave pairing

Kadono, Ryosuke*; Sato, Koki*; Koda, Akihiro*; Nagata, Takashi*; Furukawa, Hazuki*; Suzuki, Junichi; Matsuda, Masaaki; Oishi, Kazuki; Higemoto, Wataru; Kuroiwa, Sogo*; et al.

Physical Review B, 74(2), p.024513_1 - 024513_5, 2006/07

 Times Cited Count:10 Percentile:44.69(Materials Science, Multidisciplinary)

The response of vortex state to the magnetic field in Nb$$_3$$Sn is probed using muon spin rotation and small-angle neutron scattering. A transformation of vortex structure between hexagonal and squared lattice is observed over a relatively low field range of 2-3T. The gradual increase of the magnetic penetration depth with increasing field provides microscopic evidence for anisotropic (or multigapped) $$s$$-wave pairing suggested by the Raman scattering experiment. This result renders need for careful examination on the difference of electronic properties between Nb$$_3$$Sn and V$$_3$$Si.

Journal Articles

Magnetic response in the superconducting state of $$1H$$-Ca(Al$$_{0.5}$$Si$$_{0.5}$$)$$_2$$ studied by $$mu$$SR

Kuroiwa, Sogo*; Takagiwa, Hiroyuki*; Yamazawa, Maki*; Tomita, Yoko*; Akimitsu, Jun*; Oishi, Kazuki; Koda, Akihiro*; Saha, S. R.*; Kadono, Ryosuke*; Higemoto, Wataru

Physica B; Condensed Matter, 374-375, p.251 - 254, 2006/03

 Times Cited Count:1 Percentile:6.69(Physics, Condensed Matter)

Magnetic field dependence of the effective penetration depth ($$lambda$$) determined by $$mu$$SR is reported for $$1H$$-Ca(Al$$_{0.5}$$Si$$_{0.5}$$)$$_2$$, a structurally new phase of Ca(Al$$_{0.5}$$Si$$_{0.5}$$)$$_2$$. The new phase has an AlB$$_2$$-type crystal structure with $$P$$3 symmetry which, in contrast to earlier reports, does not exhibit superlattice structure along the $$c$$-axis. The bulk susceptibility measurement indicates that the upper critical field is much lower than that in superstructured ones for both $$c$$- and $$a$$-axis directions. A weak anisotropy in the superconducting order parameter is suggested from the increase of $$lambda$$ with increasing external field.

Journal Articles

Magnetic and superconducting phase diagram in oxybromite cuprate Ca$$_{2-x}$$Na$$_x$$CuO$$_2$$Br$$_2$$

Kuroiwa, Sogo*; Zenitani, Yuji*; Yamazawa, Maki*; Tomita, Yoko*; Akimitsu, Jun*; Oishi, Kazuki; Koda, Akihiro*; Saha, S. R.*; Kadono, Ryosuke*; Watanabe, Isao*; et al.

Physica B; Condensed Matter, 374-375, p.75 - 78, 2006/03

 Times Cited Count:1 Percentile:6.69(Physics, Condensed Matter)

A comprehensive magnetic and superconducting phase diagram determined by muon spin rotation/relaxation ($$mu$$SR) is presented for Ca$$_{2-x}$$Na$$_x$$CuO$$_2$$Br$$_2$$ which has apical bromine atoms. Evidence for antiferromagnetic (AF) order in lightly doped samples and that for quasi-static spin glass (SG)-like state in moderately doped ones are obtained by ZF-$$mu$$SR at low temperatures. While the phase diagram is qualitatively similar to that in typical 2-1-4 cuprates including Ca$$_{2-x}$$Na$$_x$$CuO$$_2$$Cl$$_2$$ and La$$_{2-x}$$Sr$$_x$$CuO$$_4$$, it exhibits a slight shift (expansion) over the $$x$$ axis.

Journal Articles

Possible weak magnetism in MB$$_6$$ (M: Ca, Ba) probed by muon spin relaxation and muon level-crossing resonance

Kuroiwa, Sogo*; Takagiwa, Hiroyuki*; Yamazawa, Maki*; Akimitsu, Jun*; Koda, Akihiro*; Kadono, Ryosuke*; Oishi, Kazuki; Higemoto, Wataru; Watanabe, Isao*

Science and Technology of Advanced Materials, 7(1), p.12 - 16, 2006/01

 Times Cited Count:5 Percentile:22.49(Materials Science, Multidisciplinary)

The temperature dependence of muon spin relaxation rate exhibits a significant increase below $$sim$$130 K in CaB$$_6$$ and $$sim$$110 K in BaB$$_6$$, while no sigh of spontaneous muon precession signal under a zero field is observed. Moreover, the electric field gradient at the boron site measured by muon level-crossing resonance exhibits a step like change at $$sim$$110 K in CaB$$_6$$. These results suggest a change in electronic state and the associated emergence of weak random magnetism below 110-130 K in these alkaline earth hexaborides.

Journal Articles

Hole-induced novel spin state within Haldane gap in Nd$$_{2-x}$$Ca$$_x$$BaNiO$$_5$$

Sasaki, Tomoyuki*; Yokoo, Tetsuya*; Katano, Susumu; Akimitsu, Jun*

Journal of the Physical Society of Japan, 74(1), p.267 - 270, 2005/01

 Times Cited Count:2 Percentile:19.84(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Anomalous spin density distribution in CeB$$_{6}$$

Saito, Masahiro*; Okada, Noriko*; Nishibori, Eiji*; Takagiwa, Hiroyuki*; Yokoo, Tetsuya*; Nishi, Masakazu*; Kakurai, Kazuhisa; Kunii, Satoru*; Takata, Masaki*; Sakata, Makoto*; et al.

Journal of the Physical Society of Japan, 71(10), p.2369 - 2372, 2002/10

 Times Cited Count:12 Percentile:58.93(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Spin gap in the hole-doped spin ladder system (Sr$$_{2.5}$$Ca$$_{11.5}$$)Cu$$_{24}$$O$$_{41}$$; Neutron inelastic scattering study

Katano, Susumu; *; Akimitsu, Jun*; Nishi, Masakazu*; Kakurai, Kazuhisa*

Physical Review Letters, 82(3), p.636 - 639, 1999/01

 Times Cited Count:65 Percentile:88.79(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

New aspects of the b$$^{ast}$$LA phonon of CuGeO$$_{3}$$

Nishi, Masakazu*; Kakurai, Kazuhisa*; Fujii, Yasuhiko*; Katano, Susumu; Akimitsu, Jun*; M.Yethiraj*; Fernandez-Baca, J. A.*

Journal of Physics and Chemistry of Solids, 60(8-9), p.1109 - 1111, 1999/00

 Times Cited Count:5 Percentile:33.83(Chemistry, Multidisciplinary)

no abstracts in English

Journal Articles

Coexistence of the spin liquid state and the magnetic ordering in the spin ladder compound; Sr$$_{14-x}$$Ca$$_{x}$$Cu$$_{24}$$O$$_{41}$$

*; *; *; Akimitsu, Jun*; Katano, Susumu; Nishi, Masakazu*; Kakurai, Kazuhisa*

Journal of Physics and Chemistry of Solids, 60(8-9), p.1039 - 1043, 1999/00

 Times Cited Count:2 Percentile:23.17(Chemistry, Multidisciplinary)

no abstracts in English

Journal Articles

Antiferromagnetic ordering in the spin singlet state of the ladder/chain material: Sr$$_{2.5}$$Ca$$_{11.5}$$Cu$$_{24}$$O$$_{41}$$

Nagata, Takashi*; *; Akimitsu, Jun*; Nishi, Masakazu*; Kakurai, Kazuhisa*; Katano, Susumu; *; *; Kobayashi, Norio*

Journal of the Physical Society of Japan, 68(7), p.2206 - 2209, 1999/00

 Times Cited Count:33 Percentile:80.36(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Pressure effects on spin-gap and antiferromagnetism in the hole-doped spin ladder system Sr$$_{2.5}$$Ca$$_{11.5}$$Cu$$_{24}$$O$$_{41}$$

Katano, Susumu; *; *; Akimitsu, Jun*; Nishi, Masakazu*; Kakurai, Kazuhisa*

Physica B; Condensed Matter, 259-261, p.1046 - 1047, 1999/00

 Times Cited Count:10 Percentile:52.1(Physics, Condensed Matter)

no abstracts in English

Journal Articles

Magnetic phase diagram of the spin-peierls and artiferromagnetic system CuGe$$_{1-x}$$Si$$_{x}$$O$$_{3}$$

Katano, Susumu; *; Akimitsu, Jun*; Nishi, Masakazu*; Kakurai, Kazuhisa*; Fujii, Yasuhiko*

Physical Review B, 57(17), p.10280 - 10283, 1998/05

 Times Cited Count:12 Percentile:55.84(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Solid state reactions and some physical properties of reduced europium niobates Eu$$_{x}$$NbO$$_{y}$$(0.5≦x≦2)

Nakamura, Akio; ; Nakada, Masami; Saeki, Masakatsu; *; Akimitsu, Jun*

Ceramic Transactions, 71, p.295 - 306, 1996/00

no abstracts in English

Journal Articles

Phase diagram of the new superconductor Sr$$_{2}$$CuO$$_{2}$$(CO$$_{3}$$)$$_{1-x}$$(BO$$_{3}$$)$$_{x}$$

*; *; Yokoo, Tetsuya*; *; Akimitsu, Jun*; Katano, Susumu

Physica C, 263(1-4), p.344 - 348, 1996/00

 Times Cited Count:1 Percentile:9.41(Physics, Applied)

no abstracts in English

Journal Articles

Pressure effects on the dimerization in the spin-Peierls state of CuGeO$$_{3}$$

Katano, Susumu; *; Akimitsu, Jun*; Nishi, Masakazu*

Physical Review B, 52(21), p.15364 - 15367, 1995/12

 Times Cited Count:25 Percentile:78.87(Materials Science, Multidisciplinary)

no abstracts in English

27 (Records 1-20 displayed on this page)