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Journal Articles

Two-step quantum spin flop transition in spin ladders

Sakai, Toru; Okamoto, Kiyomi*; Tonegawa, Takashi*

Journal of Physics; Conference Series, 150, p.042169_1 - 042169_4, 2009/03

 Times Cited Count:2 Percentile:76.06

The magnetization process of the spin ladder systems with ferromagnetic rung exchange interaction is theoretically investigated using the numerical exact diagonalization and the finite-size scaling technique. It is found that with some easy-axis anisotropy the system would exhibit a new two-step spin flop transition induced by an external magnetic field.

Journal Articles

Oscillation photography applied to resonant X-ray diffraction

Inami, Toshiya; Toyokawa, Hidenori*; Terada, Noriki*; Kitazawa, Hideaki*

Journal of Physics; Conference Series, 150, p.042069_1 - 042069_4, 2009/03

 Times Cited Count:1 Percentile:62.72

Journal Articles

High pressure study on uranium heavy fermion compounds with antiferromagnetic ground state

Tateiwa, Naoyuki; Ikeda, Shugo*; Haga, Yoshinori; Matsuda, Tatsuma; Nakashima, Miho*; Aoki, Dai*; Settai, Rikio*; Onuki, Yoshichika

Journal of Physics; Conference Series, 150, p.042206_1 - 042206_4, 2009/03

 Times Cited Count:4 Percentile:88.15

We have studied the high pressure effect on the antiferromagnetic ground states of uranium heavy fermion compounds. In this paper we show our high pressure studies on U$$_2$$Zn$$_{17}$$ by the electrical resistivity measurements. In U$$_2$$Zn$$_{17}$$, the N$'e$el temperature $$T_{rm N}$$ in U$$_2$$Zn$$_{17}$$ decreases slightly from 9.66 K at 1 bar to 9.33 K at 2.5 GPa, becomes almost pressure-independent up to 4.7 GPa, and starts to increase at the higher pressure region. We discuss the pressure dependences of the coefficient of $$T^2$$ term in the electrical resistivity $$A$$, an antiferromagnetic gap $$Delta$$ and a characteristic temperature $$T_{{rho}{rm max}}$$. It is found that the effect of pressure on the electronic states in U$$_2$$Zn$$_{17}$$ is weak compared with the other heavy fermion compounds.

Journal Articles

Ferromagnetism and orbital order in the two-orbital Hubbard model

Kubo, Katsunori

Journal of Physics; Conference Series, 150(4), p.042101_1 - 042101_4, 2009/03

 Times Cited Count:1 Percentile:62.72

Journal Articles

La-NMR study on a La dilute system of PrPb$$_3$$

Tokunaga, Yo; Suzuki, Hiroyuki*; Sakai, Hironori; Chudo, Hiroyuki; Kambe, Shinsaku; Yasuoka, Hiroshi; Homma, Yoshiya*; Aoki, Dai*; Shiokawa, Yoshinobu*

Journal of Physics; Conference Series, 150, p.042211_1 - 042211_4, 2009/00

 Times Cited Count:2 Percentile:76.06

The first $$^{139}$$La-NMR measurement has been carried out on a La dilute system of PrPb$$_3$$. We have succeeded to detect $$^{139}$$La-NMR signal on a powder sample of Pr$$_{0.97}$$La$$_{0.03}$$Pb$$_3$$ and extracted the temperature dependence of the Knight shift $$^{139}K(T)$$ in a temperature range between 1.5 and 220 K. $$^{139}K(T)$$ has been found to maintain a linear relation with the bulk-susceptibility $$chi(T)^{rm bulk}$$ in wide temperature range, except for a small deviation in the temperature region below 6 K. The slopes of the $$^{139}K$$ vs $$chi^{rm bulk}$$ plots yield for the hyperfine coupling constants $$A_{rm hf}$$ the value 375 Oe/$$mu _B$$. From the NMR results, we discuss the effect of the La substitutions on microscopic magnetic properties of PrPb$$_3$$.

Oral presentation

Inelastic X-ray scattering study of phonons in the multiferroic compound TbMnO$$_3$$

Kajimoto, Ryoichi; Sagayama, Hajime*; Sasai, Kenzo*; Fukuda, Tatsuo; Tsutsui, Satoshi*; Arima, Takahisa*; Hirota, Kazuma*; Mitsui, Yukari*; Yoshizawa, Hideki*; Baron, A. Q. R.*; et al.

no journal, , 

Oral presentation

Charge dynamics in YVO$$_{3}$$ investigated by resonant inelastic X-ray scattering

Ikeuchi, Kazuhiko; Jarrige, I.; Ishii, Kenji; Inami, Toshiya; Mizuki, Junichiro; Bizen, Daisuke*; Murakami, Yoichi*; Miyasaka, Shigeki*; Fujioka, Jun*; Tokura, Yoshinori*

no journal, , 

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