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Journal Articles

Delocalization of the $$f$$ electron in Ce$$_x$$La$$_{1-x}$$Ru$$_2$$Si$$_2$$; The de Haas-van Alphen effect measurement

Matsumoto, Yuji; Kimura, Noriaki*; Komatsubara, Takemi*; Aoki, Haruyoshi*; Kurita, Nubuyuki*; Terashima, Taichi*; Uji, Shinya*

Journal of Physics; Conference Series, 391, p.012042_1 - 012042_4, 2012/12

 Times Cited Count:1 Percentile:46.08

CeRu$$_2$$Si$$_2$$ is a paramagnetic heavy fermion compound with the electronic specific heat coefficient $$gamma$$ of 350 mJ/mol K$$^2$$. When a magnetic field is applied along the [001] direction of its tetragonal ThCr$$_2$$Si$$_2$$ structure, it exhibits metamagnetic transition at 7.7 T. On the other hand, when a magnetic field is applied in the (001) plane, metamagnetic transition does not occur. This magnetic anisotropy is maintained to lower Ce concentration samples. By replacing Ce with La, CeRu$$_2$$Si$$_2$$ changes to antiferromagnet at $$x_c$$ $$sim$$ 0.91 and finally to normal paramagnet of LaRu$$_2$$Si$$_2$$. In very low Ce concentration samples, the impurity Kondo effect is observed. The Kondo temperature of the $$x$$ = 0.02 sample is about 1 K. We have successfully observed all the dHvA oscillations in the dilute Ce concentration samples with fields in the (001) plane. Moreover, we have observed the variation of the dHvA oscillations with temperature crossing the Kondo temperature.

Journal Articles

Magnetic behavior near the boundary of 4$$f$$ delocalization in ferromagnetic CeRu$$_2$$Ge$$_2$$ and paramagnetic CeRu$$_2$$Si$$_2$$ observed by Ce $$M_{4,5}$$ XAS and XMCD

Okane, Tetsuo; Takeda, Yukiharu; Yamagami, Hiroshi; Fujimori, Atsushi; Matsumoto, Yuji; Kimura, Noriaki*; Komatsubara, Takemi*; Aoki, Haruyoshi*

Physical Review B, 86(12), p.125138_1 - 125138_11, 2012/09

 Times Cited Count:9 Percentile:41.97(Materials Science, Multidisciplinary)

Journal Articles

Resonant angle-resolved photoelectron spectroscopy of substitutional solid solutions of CeRu$$_2$$Si$$_2$$

Okane, Tetsuo; Kawasaki, Ikuto; Yasui, Akira; Okochi, Takuo*; Takeda, Yukiharu; Fujimori, Shinichi; Saito, Yuji; Yamagami, Hiroshi; Fujimori, Atsushi; Matsumoto, Yuji*; et al.

Journal of the Physical Society of Japan, 80(Suppl.A), p.SA060_1 - SA060_3, 2011/07

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

Journal Articles

Band structures of CeRu$$_2$$(Si$$_{1-x}$$Ge$$_{x}$$)$$_2$$ studied by resonant soft X-ray ARPES

Okane, Tetsuo; Okochi, Takuo*; Takeda, Yukiharu; Fujimori, Shinichi; Yasui, Akira; Saito, Yuji; Yamagami, Hiroshi; Fujimori, Atsushi; Matsumoto, Yuji*; Sugi, Motoki*; et al.

Physica Status Solidi (B), 247(3), p.397 - 399, 2010/03

Journal Articles

4$$f$$-derived Fermi surfaces of CeRu$$_2$$(Si$$_{1-x}$$Ge$$_{x}$$)$$_2$$ near the quantum critical point; Resonant soft-X-ray ARPES study

Okane, Tetsuo; Okochi, Takuo*; Takeda, Yukiharu; Fujimori, Shinichi; Yasui, Akira; Saito, Yuji; Yamagami, Hiroshi; Fujimori, Atsushi; Matsumoto, Yuji*; Sugi, Motoki*; et al.

Physical Review Letters, 102(21), p.216401_1 - 216401_4, 2009/05

 Times Cited Count:25 Percentile:76.17(Physics, Multidisciplinary)

Journal Articles

Magnetization dynamics in the normal and superconducting phases of UPd$$_2$$Al$$_3$$, 1; Surveys in reciprocal space using neutron inelastic scattering

Hiess, A.*; Bernhoeft, N.*; Metoki, Naoto; Lander, G.*; Roessli, B.*; Sato, Noriaki*; Aso, Naofumi*; Haga, Yoshinori; Koike, Yoshihiro*; Komatsubara, Takemi*; et al.

Journal of Physics; Condensed Matter, 18(27), p.R437 - R451, 2006/07

This topical review presents results from neutron inelastic scattering experiments on single crystals of UPd$$_2$$Al$$_3$$. We present a detailed and complete characterization of the wave vector- and energy-dependent magnetization dynamics in UPd$$_2$$Al$$_3$$ as measured by neutron inelastic scattering primarily in the form of extensive surveys in energy-momentum space under a wide range of experimental conditions, and put our observations in context with data that has been published previously by two independent groups. This study yields unique insight into the low-temperature ground state, which exhibits a microscopic coexistence of antiferromagnetism and superconductivity, makingUPd$$_2$$Al$$_3$$ one of the most accessible heavy-fermion superconductors that can be fully characterized by neutron spectroscopy.

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:15.73(Physics, Condensed Matter)

no abstracts in English

Journal Articles

Magnetic structure, phase diagram, and a new type of spin-flop transition dominated by higher order interaction in a localized 5$$f$$ system U$$_{3}$$Pd$$_{20}$$Si$$_{6}$$

Koike, Yoshihiro; Metoki, Naoto; Haga, Yoshinori; McEwen, K. A.*; Kogi, Masafumi*; Yamamoto, Ryunosuke*; Aso, Naofumi*; Tateiwa, Naoyuki*; Komatsubara, Takemi*; Kimura, Noriaki*; et al.

Physical Review Letters, 89(7), p.077202_1 - 077202_4, 2002/08

 Times Cited Count:7 Percentile:48.12(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Neutron scattering experiment on U$$_3{}$$Pd$$_{20}$$Si$$_{6}$$, 1; Crystal and magnetic structure

Tateiwa, Naoyuki*; Metoki, Naoto; Koike, Yoshihiro; Oikawa, Kenichi*; Kimura, Noriaki*; Aoki, Haruyoshi*; Komatsubara, Takemi*

Physica B; Condensed Matter, 312-313, p.891 - 893, 2002/03

 Times Cited Count:0 Percentile:0(Physics, Condensed Matter)

no abstracts in English

Journal Articles

Neutron scattering study on the crystal structure, magnetic ordering, and crystalline electric field excitations in an uranium metallic compound U$$_{3}$$Pd$$_{20}$$Si$$_{6}$$

Tateiwa, Naoyuki*; Metoki, Naoto; Koike, Yoshihiro; Oikawa, Kenichi; Kimura, Noriaki*; Komatsubara, Takemi*; Aoki, Haruyoshi*

Journal of the Physical Society of Japan, 70(8), p.2425 - 2436, 2001/08

 Times Cited Count:14 Percentile:62.86(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

The U 5f states in the heavy fermion uranium compound UPd$$_{2}$$Al$$_{3}$$, studied by resonant and X-ray photoelectron spectroscopy

Fujimori, Shinichi; *; *; *; *; *; *; Okane, Tetsuo; *; *; et al.

Journal of Electron Spectroscopy and Related Phenomena, 101-103, p.439 - 442, 1999/00

 Times Cited Count:4 Percentile:23.18(Spectroscopy)

no abstracts in English

Journal Articles

Strong correlation between magnetism and superconductivity in a single crystalline UNi$$_{2}$$Al$$_{3}$$ and UPd$$_{2}$$Al$$_{3}$$

*; Aso, N.*; Tateiwa, Naoyuki*; *; Komatsubara, Takemi*; Metoki, Naoto

Physica B; Condensed Matter, 230-232, p.367 - 369, 1997/00

 Times Cited Count:15 Percentile:67.48(Physics, Condensed Matter)

no abstracts in English

Oral presentation

Soft X-ray angle-resolved photoelectron spectroscopy of CeRu$$_2$$(Si$$_{1-x}$$Ge$$_x$$)$$_2$$

Okane, Tetsuo; Okochi, Takuo; Fujimori, Shinichi; Takeda, Yukiharu; Yasui, Akira; Saito, Yuji; Yamagami, Hiroshi; Fujimori, Atsushi; Matsumoto, Yuji*; Kimura, Noriaki*; et al.

no journal, , 

no abstracts in English

Oral presentation

Resonant angle-resolved photoemission study of CeRu$$_2$$(Si$$_{1-x}$$Ge$$_x$$)$$_2$$ and Ce$$_{1-x}$$La$$_x$$Ru$$_2$$Si$$_2$$

Okane, Tetsuo; Okochi, Takuo*; Yasui, Akira; Kawasaki, Ikuto; Fujimori, Shinichi; Takeda, Yukiharu; Saito, Yuji; Yamagami, Hiroshi; Fujimori, Atsushi; Matsumoto, Yuji*; et al.

no journal, , 

no abstracts in English

Oral presentation

Fermi surfaces of substitutional solid solution system of CeRu$$_2$$Si$$_2$$ studied by resonant angle-resolved photoelectron spectroscopy

Okane, Tetsuo; Okochi, Takuo*; Yasui, Akira; Kawasaki, Ikuto; Fujimori, Shinichi; Takeda, Yukiharu; Saito, Yuji; Yamagami, Hiroshi; Fujimori, Atsushi; Matsumoto, Yuji*; et al.

no journal, , 

no abstracts in English

Oral presentation

Change of Fermi surface properties in dilute Ce concentration of Ce$$_x$$La$$_{1-x}$$Ru$$_2$$Si$$_2$$ system, 3

Matsumoto, Yuji; Kimura, Noriaki*; Komatsubara, Takemi*; Aoki, Haruyoshi*; Kurita, Nubuyuki*; Terashima, Taichi*; Uji, Shinya*

no journal, , 

We have performed the de Haas - van Alphen (dHvA) effect measurements in Ce$$_x$$La$$_{1-x}$$Ru$$_2$$Si$$_2$$ with magnetic fields in the (001) plane. All the oscillations corresponding to those in LaRu$$_2$$Si$$_2$$ can be observed in low Ce concentration samples and the evolution of the Fermi surface properties with x is found to depend strongly on the Fermi surface sheet. We will argue that the evolution can be attributed to anisotropic hybridization of the f electron with conduction electrons and resultant delocalization of the f electron.

Oral presentation

X-ray magnetic circular dichroism study at Ce $$M_{4,5}$$ edges of CeRu$$_2$$Si$$_2$$ and CeRu$$_2$$Ge$$_2$$

Okane, Tetsuo; Takeda, Yukiharu; Yamagami, Hiroshi; Fujimori, Atsushi; Matsumoto, Yuji; Kimura, Noriaki*; Komatsubara, Takemi*; Aoki, Haruyoshi*

no journal, , 

no abstracts in English

17 (Records 1-17 displayed on this page)
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