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Journal Articles

Resonant X-ray scattering in KCuF$$_{3}$$

Takahashi, Manabu*; Igarashi, Junichi

Physica B; Condensed Matter, 329-333(Part2), p.870 - 871, 2003/05

 Times Cited Count:2 Percentile:15.24(Physics, Condensed Matter)

We study the resonant X-ray scattering (RXS) spectra around the Cu K edge in KCuF$$_{3}$$ on the basis of the band structure calculation combined with the LDA+U approximation. The lattice distortion is introduced as inputs of the calculation. We reproduce well the experimental spectra as a function of photon energy around the main--K--edge (MKE). The spectral structure around the MKE is independent of the magnetic order (MO) and the orbital order (OO) but strongly dependent on the magnitude of the Jahn--Teller distortion (JTD).

Journal Articles

Mechanism of resonant X-ray scattering in DyB$$_{2}$$C$$_{2}$$

Nagao, Tatsuya*; Igarashi, Junichi

Physica B; Condensed Matter, 329-333(Part2), p.628 - 630, 2003/05

 Times Cited Count:5 Percentile:31.57(Physics, Condensed Matter)

For elucidating the relation between the resonant X-ray scattering (RXS) signal and the orbital order, we calculate the RXS spectra near the Dy L$$_{III}$$ absorption edge in DyB$$_{2}$$C$$_{2}$$, in the antiferro-quadrupole (AFQ) ordering phase. Using a microscopic model that the 4f states of Dy are atomic while the 5d states form an energy band with a reasonable density of states, we obtain sufficient RXS intensities on the AFQ superlattice spot assuming the quadrupole order in the 4f states but without any lattice distortion, in good agreement with the recent experiment. The present result demonstrates the mechanism that the intensity is brought about by the modulation of 5d states through the anisotropic term of the 5d-4f Coulomb interaction.

Journal Articles

Charge disproportionation and magnetic properties in perovskite iron oxides

Kuzushita, Kaori; Morimoto, Shotaro*; Nasu, Saburo*

Physica B; Condensed Matter, 329-333(1-4), p.736 - 737, 2003/05

 Times Cited Count:9 Percentile:46.18(Physics, Condensed Matter)

The physical properties of perovskite iron oxides are closely related to the network of FeO$$_6$$ octahedra. The charge disproportionation (2Fe$$^{4+}$$ $$rightarrow$$ Fe$$^{3+}$$ + Fe$$^{5+}$$), not observed in SrFeO$$_3$$, occurs in the oxides being cut the network of FeO$$_6$$ octahedra, for example, by introduction of Fe$$^{3+}$$ by substitution La for Sr and change in the dimension by insertion of SrO layer. When Co is substituted 40% of Fe in Sr$$_3$$Fe$$_2$$O$$_7$$, the magnetic order changes to ferromagnetic from antiferromagnetic and charge disproportionation is suppressed.

Journal Articles

Resonant X-ray scattering study on the filled skutterudite PrFe$$_4$$P$$_{12}$$

Ishii, Kenji; Inami, Toshiya; Murakami, Yoichi; Hao, L.*; Iwasa, Kazuaki*; Kogi, Masafumi*; Aoki, Yuji*; Sugawara, Hitoshi*; Sato, Hideyuki*; Imada, Shin*; et al.

Physica B; Condensed Matter, 329-333(1-4), p.467 - 468, 2003/05

 Times Cited Count:6 Percentile:35.77(Physics, Condensed Matter)

Resonant x-ray scattering study was carried out to investigate an anomalous ordered state ($$T_A$$ = 6.5 K) in the filled skutterudite PrFe$$_4$$P$$_{12}$$. At the Pr-$$L_{III}$$ absorption edge, we observed resonant features in $$h+k+l$$ = odd reflections, which are forbidden in the $$bcc$$ structure above $$T_A$$. Because these reflections contain the difference of anomalous scattering factor between two Pr atoms in the $$bcc$$ unit cell, and the ordered state is attributed to the ordering of two different electronic states of Pr.

Journal Articles

Polarized neutron scattering study of the CuO$$_{2}$$ chains in Ca$$_{2}$$Y$$_{2}$$Cu$$_{5}$$O$$_{10}$$

Matsuda, Masaaki; Nakamura, Mitsutaka; Takeda, Masayasu*; Kakurai, Kazuhisa; Yamaguchi, Hirotaka*; Ito, Toshimitsu*; Oka, Kunihiko*

Physica B; Condensed Matter, 329-333(1-4), p.711 - 712, 2003/05

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

no abstracts in English

Journal Articles

Synthesis and physical properties of pyrochlore iridium oxides Pb$$_{2-x}$$Ca$$_{x}$$Ir$$_{2}$$O$$_{7-y}$$

Sakai, Hironori; Ono, Hiroyuki*; Oba, Noriaki*; Kato, Masaki*; Yoshimura, Kazuyoshi*

Physica B; Condensed Matter, 329-333(2), p.1038 - 1039, 2003/05

 Times Cited Count:4 Percentile:27.1(Physics, Condensed Matter)

Pyrochlore iridium oxides Pb$$_{2-x}$$Ca$$_{x}$$Ir$$_{2}$$O$$_{7-y}$$ ($$x$$=0.0, 0.2, 0.4, 0.6, 0.8) were prepared by solid state reaction. The electrical resistivity and the magnetic susceptibility were measured between 4.2 and 300 K. These compounds show metallic conductivity and obey the Curie-Weiss law with temperature independent term. The metallic conductivity of Pb$$_{2}$$Ir$$_{2}$$O$$_{7}$$ is suppressed by the Ca substitution for Pb site.

Journal Articles

Electronic structure and the fermi surface of UTGa$$_{5}$$ (T=Fe, Co, Rh)

Maehira, Takahiro; Higuchi, Masahiko*; Hasegawa, Akira*

Physica B; Condensed Matter, 329-333(1-4), p.574 - 575, 2003/05

 Times Cited Count:20 Percentile:67.17(Physics, Condensed Matter)

The relativistic energy-band calculations have been carried out for $${rm UFeGa_{5}}$$, $${rm UCoGa_{5}}$$ and $${rm URhGa_{5}}$$ under the assumption that 5$$f$$-electrons are itinerant. A hybridization between the U 5$$f$$ state and Ga 4$$p$$ state occurs in the vicinity of the Fermi level. The Fermi surface of $${rm UCoGa_{5}}$$ is quite similar to that of $${rm URhGa_{5}}$$, which are all small in size and closed in topology. $${rm UFeGa_{5}}$$ has the quasi-two-dimensional Fermi surface which looks like a lattice structure.

Journal Articles

Effects of quantum lattice vibration on the spin-Peierls transition

Onishi, Hiroaki; Miyashita, Seiji*

Physica B; Condensed Matter, 329-333(2), p.874 - 875, 2003/05

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

We investigate a one-dimensional $$S=1/2$$ antiferromagnetic Heisenberg model coupled to quantum lattice vibration by a quantum Monte Carlo method. For heavy mass, the lattice fluctuation can be regarded to be adiabatic and the system dimerizes at low temperature. On the other hand, for light mass, the lattice takes a uniform configuration on the thermal average and magnetic properties coincide with those of the uniform lattice system. These phenomena can be understood from the difference of the time scale of the motion between the spin and the lattice.

Journal Articles

Neutron diffractioin study of 5$${it f}$$ itinerant antiferromagnet UPtGa$$_{5}$$ and UNiGa$$_{5}$$

Kaneko, Koji; Metoki, Naoto; Lander, G. H.*; Bernhoeft, N.*; Tokiwa, Yoshifumi; Haga, Yoshinori; Onuki, Yoshichika; Ishii, Yoshinobu

Physica B; Condensed Matter, 329-333(1-4), p.510 - 511, 2003/05

 Times Cited Count:3 Percentile:21.47(Physics, Condensed Matter)

no abstracts in English

Journal Articles

Magnetic and Fermi surface properties of UTGa$$_{5}$$(T:Fe, Co and Pt)

Ikeda, Shugo; Tokiwa, Yoshifumi*; Okubo, Tomoyuki*; Yamada, Mineko*; Matsuda, Tatsuma; Inada, Yoshihiko*; Settai, Rikio*; Yamamoto, Etsuji; Haga, Yoshinori; Onuki, Yoshichika

Physica B; Condensed Matter, 329-333(2), p.610 - 611, 2003/05

 Times Cited Count:13 Percentile:56.24(Physics, Condensed Matter)

no abstracts in English

Journal Articles

Electrochemical synthesis of superconductive MgB$$_{2}$$ from molten salts

Yoshii, Kenji; Abe, Hideki*

Physica C, 388-389(1-4), p.113 - 114, 2003/05

no abstracts in English

Journal Articles

Phase diagram and dynamical matching of Josephson vortices in mesoscopic layered high-Tc superconductors

Machida, Masahiko

Physica C, 388-389, p.679 - 680, 2003/05

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

no abstracts in English

Journal Articles

Flux quantanization in a superconducting microdisk

Hata, Yoshiaki; Suzuki, Junichi; Kakeya, Itsuhiro*; Kadowaki, Kazuo*; Odawara, Akikazu*; Nagata, Atsushi*; Nakayama, Satoshi*; Chinone, Kazuo*

Physica C, 388-389(1-4), p.719 - 720, 2003/05

no abstracts in English

Journal Articles

Orbital ordering in UGa$$_{3}$$; Detection by 69Ga NMR

Kambe, Shinsaku; Kato, Harukazu; Sakai, Hironori; Walstedt, R. E.; Aoki, Dai*; Haga, Yoshinori; Onuki, Yoshichika

Physical Review B, 66(22), p.220403_1 - 220403_4, 2002/12

 Times Cited Count:9 Percentile:45.4(Materials Science, Multidisciplinary)

69Ga NMR has been measured in the paramagnetic and antiferromagnetic states of UGa$$_{3}$$(TN=67K). The temperature dependence of Knight shift has been determined. Based on the temperature dependence of static susceptibility, K- chi ploy is obtained. The slope of the plot corresponds to the hyperfine coupling constant. The hyperfine coupling constant is changed at TN and the second transition 40K. This fact indicates that the electronic sturcture is changed drastically at the transitions.

14 (Records 1-14 displayed on this page)
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