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Journal Articles

Magnetic phase diagram and change in 5f electronic states in NpNiGa$$_{5}$$

Honda, Fuminori; Metoki, Naoto; Kaneko, Koji; Jonen, Shintaro; Yamamoto, Etsuji; Aoki, Dai*; Shiokawa, Yoshinobu*; Shiokawa, Yoshinobu; Onuki, Yoshichika

Physica B; Condensed Matter, 378-380, p.1009 - 1010, 2006/05

https://doi.org/10.1016/j.physb.2006.01.471
 Times Cited Count：6 Percentile：29.78(Physics, Condensed Matter)

no abstracts in English

Journal Articles

Anomalous magnetic correlations in heavy fermion Pauli paramagnet UIr$$_3$$B$$_2$$; $$^{11}$$B NMR study

Fujimoto, Tatsuya; Sakai, Hironori; Tokunaga, Yo; Kambe, Shinsaku; Walstedt, R. E.; Ikeda, Shugo; Matsuda, Tatsuma; Haga, Yoshinori; Onuki, Yoshichika

Physica B; Condensed Matter, 378-380, p.997 - 998, 2006/05

https://doi.org/10.1016/j.physb.2006.01.382
 Times Cited Count：0 Percentile：0.00(Physics, Condensed Matter)

We report $$^{11}$$B NMR results of a single crystal UIr$$_3$$B$$_2$$. The measurement was performed by Fast Fourier Transformation technique, because spectral line width is extremely narrow ($$simeq$$ 10 kHz) and NMR occurs in quite limited r.f. band due to a good sample quality. From temperature variation of Knight shift and nuclear spin-lattice relaxation rate, the development of ferromagnetic correlations was clarified in the temperature range above $$T^{*} simeq 50$$ K. On the other hand, the magnetic dynamics was changed into another novel state below $$T^{*}$$; ferromagnetic correlations are restrained, meanwhile antiferromagnetic correlations are newly emerged. To explain this characteristic ground state, the one-dimensional $$5f$$ electrons state due to the unique structural lattice of UIr$$_3$$B$$_2$$ was proposed.

Journal Articles

Multipolar ordering in NpO$$_2$$ probed by NMR

Tokunaga, Yo; Homma, Yoshiya*; Kambe, Shinsaku; Aoki, Dai*; Sakai, Hironori; Yamamoto, Etsuji; Nakamura, Akio; Shiokawa, Yoshinobu; Walstedt, R. E.; Yasuoka, Hiroshi

Physica B; Condensed Matter, 378-380, p.929 - 930, 2006/05

https://doi.org/10.1016/j.physb.2006.01.353
 Times Cited Count：4 Percentile：21.42(Physics, Condensed Matter)

We have initiated the first $$^{17}$$O-NMR measurements in the ordered state of NpO$$_2$$. From the $$^{17}$$O-NMR spectrum, we have confirmed the occurrence of two inequivalent oxygen sites below $$T_0$$= 26 K. It has also been shown that the $$^{17}$$O-NMR spectrum in the ordered state can be understood by considering an unconventional hyperfine interaction between the $$^{17}$$O nuclear spins and field-induced antiferromagnetic moments arising from the longitudinal triple-$$bf{q}$$ antiferro-quadrupolar order. These NMR results give strong evidence for the occurrence of the longitudinal triple-$$bf{q}$$ multipole structure in NpO$$_2$$.

Journal Articles

Soft X-ray magnetic circular dichroism study of UFe$$_2$$

Okane, Tetsuo; Takeda, Yukiharu; Fujimori, Shinichi; Terai, Kota; Saito, Yuji; Muramatsu, Yasuji; Fujimori, Atsushi; Haga, Yoshinori; Yamamoto, Etsuji; Onuki, Yoshichika

Physica B; Condensed Matter, 378-380, p.959 - 960, 2006/05

https://doi.org/10.1016/j.physb.2006.01.366
 Times Cited Count：5 Percentile：25.81(Physics, Condensed Matter)

no abstracts in English

Journal Articles

Field-induced antiferroquadrupolar order in the heavy fermion superconductor PrOs$$_4$$Sb$$_{12}$$

Kaneko, Koji; Metoki, Naoto; Matsuda, Tatsuma; Kuwahara, Keitaro*; Kogi, Masafumi*; Shiina, Ryosuke*; Mignot, J.-M.*; Gukasov, A.*; Bernhoeft, N.*

Physica B; Condensed Matter, 378-380, p.189 - 191, 2006/05

https://doi.org/10.1016/j.physb.2006.01.349
 Times Cited Count：1 Percentile：6.03(Physics, Condensed Matter)

Neutron diffraction experiments under magnetic fields were carried out on the heavy fermion superconductor PrOs$$_4$$Sb$$_{12}$$ in order to reveal the origin of the field-induced ordered phase (FIOP) for $$H$$$$Vert$$[1,1,0]. The application of magnetic field induces the weak superlattice peaks with the ordering vector $$q$$=(1,0,0) in FIOP, which is the same as for $$H{parallel}$$[0,0,1]. The observed superlattice reflections for $$H$$$$Vert$$[1,1,0] result from the antiferromagnetic component of $$J_x$$+$$J_y$$; the induced tiny antiferromagnetic moments orient parallel to the applied field. This result cannot be explained by magnetic interactions and strongly evidences the underlying AFQ order with $$O_{xy}$$ as a primary order parameter. These facts clarify the dominant role of $$O_{xy}$$-type antiferroquadrupolar interaction in PrOs$$_4$$Sb$$_{12}$$.

Journal Articles

Fermi surface properties in an enhanced Pauli paramagnet NpGe$$_3$$

Aoki, Dai*; Yamagami, Hiroshi*; Homma, Yoshiya*; Shiokawa, Yoshinobu; Yamamoto, Etsuji; Nakamura, Akio; Haga, Yoshinori; Settai, Rikio*; Onuki, Yoshichika

Physica B; Condensed Matter, 378-380, p.978 - 980, 2006/05

https://doi.org/10.1016/j.physb.2006.01.373
 Times Cited Count：0 Percentile：0.00(Physics, Condensed Matter)

no abstracts in English

Journal Articles

High-resolution photoemission study of CeRhX (X=Sn, In)

Shimada, Kenya*; Namatame, Hirofumi*; Taniguchi, Masaki*; Higashiguchi, Mitsuharu*; Fujimori, Shinichi; Saito, Yuji; Fujimori, Atsushi; Kim, M. S.*; Hirata, Daisuke*; Takabatake, Toshiro*

Physica B; Condensed Matter, 378-380, p.791 - 792, 2006/05

https://doi.org/10.1016/j.physb.2006.01.289
 Times Cited Count：6 Percentile：29.78(Physics, Condensed Matter)

The Ce 4f-derived states in CeRhX (X=Sn and In) were directly examined by means of high-resolution 3d-4f resonance photoemission spectroscopy. Compared with the Kondo metal CePtSn, which has a low Kondo temperature, CeRhX has a strong Ce 4f$$^{1}$$ weight near the Fermi level ($$E$$$$_{rm F}$$) and has a weak Ce 4f$$^{0}$$ peak, indicating a strong valence fluctuation. The Ce 4f$$^{1}$$ spectral features indicate that the c-f hybridization strength in CeRhSn is weaker than that in CeRhIn.

Journal Articles

Magnetic behaviour of UB$$_4$$ at high temperatures

Galatanu, A.*; Yamamoto, Etsuji; Haga, Yoshinori; Onuki, Yoshichika

Physica B; Condensed Matter, 378-380, p.999 - 1000, 2006/05

https://doi.org/10.1016/j.physb.2006.01.383
 Times Cited Count：5 Percentile：25.81(Physics, Condensed Matter)

UB$$_4$$ is a moderate heavy fermion compound which does not exhibit any magnetic order down to 0.3 K. In this work, the magnetic properties of UB$$_4$$ are investigated in an extended temperature range, 2-800 K, on high-quality single crystals. A cross-over from a low temperature 5f itinerant behaviour to a high temperature 5f localized behaviour is observed, marked by broad peaks in the magnetic susceptibility measured along the main crystallographic axes.

Journal Articles

Ba$$_{2}$$U$$_{2}$$O$$_{7}$$; A Canted ferromagnet with double-perovskite related orthorhombic structure

Nakamura, Akio; Yoshii, Kenji

Physica B; Condensed Matter, 378-380, p.548 - 549, 2006/05

https://doi.org/10.1016/j.physb.2006.01.247
 Times Cited Count：2 Percentile：11.58(Physics, Condensed Matter)

Ba$$_{2}$$U$$_{2}$$O$$_{7}$$ with double-perovskite related orthorhombic structure has been prepared. The magnetic susceptibility measurement has revealed that this system undergoes successive magnetic transitions at 60 K and 19 K. Curie-Weiss analysis was consistent with the presence of U$$^{5+}$$ in the distorted octahedral sites. The magnetization vs. magnetic field data at 2 K exhibited a clear hysteresis loop without saturation. These results suggest that this material is a canted ferromagnet.

Journal Articles

Magnetic structure and successive phase transition in NpRhGa$$_{5}$$

Jonen, Shintaro; Metoki, Naoto; Honda, Fuminori; Kaneko, Koji; Aoki, Dai*; Homma, Yoshiya*; Yamamoto, Etsuji; Haga, Yoshinori; Shiokawa, Yoshinobu; Onuki, Yoshichika

Physica B; Condensed Matter, 378-380, p.1018 - 1020, 2006/05

https://doi.org/10.1016/j.physb.2006.01.503
 Times Cited Count：7 Percentile：33.52(Physics, Condensed Matter)

The magnetic structure of NpRhGa$$_5$$ has been investigated by neutron scattering. NpRhGa$$_5$$ exhibits two antiferromagnetic phases with transition temperatures at T$$_{N1}$$ = 36 K and T$$_{N2}$$ = 33 K. Neutron scattering experiments revealed an antiferromagnetic structure with propagation vector q = (0 0 1/2) for both, where the Np magnetic moments are oriented parallel to the c-axis for T$$_{N2}$$ $$<$$ T $$<$$ T$$_{N1}$$ and parallel to the [110] direction on basal plane for T $$<$$ T$$_{N2}$$. At T$$_{N2}$$ the reorientation of magnetic moments is accompanied by a sudden increase of magnetic moments, indicative of the first order transition. The magnetic form factor revealed a dominant contribution of the orbital moments.

Journal Articles

Phonons in UCoGa$$_{5}$$

Metoki, Naoto; Kaneko, Koji; Raymond, S.*; Sanchez, J. P.*; Piekarz, P.*; Parlinski, K.*; Ole$'s$, A. M.*; Ikeda, Shugo; Matsuda, Tatsuma; Haga, Yoshinori; et al.

Physica B; Condensed Matter, 378-380, p.1003 - 1004, 2006/05

https://doi.org/10.1016/j.physb.2006.01.543
 Times Cited Count：12 Percentile：47.80(Physics, Condensed Matter)

no abstracts in English

Journal Articles

Single crystal growth and observation of the de Haas-van Alphen effect in ThIn$$_3$$

Matsuda, Tatsuma; Haga, Yoshinori; Shishido, Hiroaki*; Ikeda, Shugo; Harima, Hisatomo*; Settai, Rikio*; Onuki, Yoshichika

Physica B; Condensed Matter, 378-380, p.1021 - 1022, 2006/05

https://doi.org/10.1016/j.physb.2006.01.470
 Times Cited Count：0 Percentile：0.00(Physics, Condensed Matter)

We have succeeded in growing a high-quality single crystal of ThIn$$_3$$ with the cubic structure by the In-flux method and measured the de Haas-van Alphen (dHvA) effect. Several dHvA branches were observed, ranging from 9.0 $$times$$ 10$$^6$$ to 9.37 $$times$$ 10$$^8$$ Oe. The experimental results are compared to the dHvA results of CeIn$$_3$$ under pressure of 2.7 GPa, together with the results of energy band calculations.

Journal Articles

Electronic structure and the Fermi surface of ThRhIn$$_5$$ in comparison with uranium and transuranium compounds

Maehira, Takahiro*; Hotta, Takashi

Physica B; Condensed Matter, 378-380, p.1027 - 1028, 2006/05

https://doi.org/10.1016/j.physb.2006.01.391
 Times Cited Count：0 Percentile：0.00(Physics, Condensed Matter)

By using a relativistic linear augmented-plane-wave method, we clarify energy band structure and the Fermi surfaces of recently synthesized thorium compound ThRhIn$$_5$$. We find several cylindrical Fermi surface sheets, which are similar to those of CeTIn$$_5$$ (T=Ir and Co), PuTGa$$_5$$ (T=Co and Rh), and AmCoGa$$_5$$. We discuss such similarity among the compounds including rare-earth or actinide ions with different $$f$$ electron numbers.

Journal Articles

Anisotropic magnetic properties of Ce$$_2$$Ni$$_3$$Ge$$_5$$ single crystal

Thamizhavel, A.*; Sugitani, Ichiro*; Obiraki, Yoshiko*; Nakashima, Miho*; Okuda, Yusuke*; Matsuda, Tatsuma; Haga, Yoshinori; Takeuchi, Tetsuya*; Sugiyama, Kiyohiro*; Settai, Rikio*; et al.

Physica B; Condensed Matter, 378-380, p.841 - 842, 2006/05

https://doi.org/10.1016/j.physb.2006.01.483
 Times Cited Count：0 Percentile：0.00(Physics, Condensed Matter)

We have succeeded in growing single crystals of Ce$$_2$$Ni$$_3$$Ge$$_5$$, which crystallizes in the orthorhombic crystal structure, by the flux method and studied the anisotropic physical properties by measuring the electrical resistivity, magnetic susceptibility and specific heat. The results of these measurements indicate that Ce$$_2$$Ni$$_3$$Ge$$_5$$ undergoes two antiferromagnetic transitions at $$T_{N1}$$=4.9 K and $$T_{N2}$$=4.3 K. The electrical resistivity and susceptibility measurements reveal strong anisotropic magnetic properties. From the specific heat measurement the electronic specific heat coefficient was found to be 90mJ/K$$^2$$mol.

Journal Articles

Pressure-induced superconductivity of Ce$$_2$$Ni$$_3$$Ge$$_5$$

Nakashima, Miho*; Kohara, Hisanori*; Thamizhavel, A.*; Matsuda, Tatsuma; Haga, Yoshinori; Hedo, Masato*; Uwatoko, Yoshiya*; Settai, Rikio*; Onuki, Yoshichika

Physica B; Condensed Matter, 378-380, p.402 - 403, 2006/05

https://doi.org/10.1016/j.physb.2006.01.063
 Times Cited Count：10 Percentile：42.67(Physics, Condensed Matter)

The N$'e$el temperature of Ce$$_2$$Ni$$_3$$Ge$$_5$$ decreases with increasing pressure $$P$$ and becomes zero at a critical pressure $$Pc sim$$ 4 Gpa. The heavy fermion state was found to be formed around $$Pc$$, in which pressure region superconductivity was found below 0.26 K.

Journal Articles

Crossover of the 5f electrons from itinerant to localized in UPtGa$$_5$$

Onuki, Yoshichika; Ikeda, Shugo; Yamagami, Hiroshi*; Galatanu, A.*; Haga, Yoshinori; Matsuda, Tatsuma; Yamamoto, Etsuji; Settai, Rikio*

Physica B; Condensed Matter, 378-380, p.972 - 973, 2006/05

https://doi.org/10.1016/j.physb.2006.01.372
 Times Cited Count：0 Percentile：0.00(Physics, Condensed Matter)

no abstracts in English

Journal Articles

Change of the Fermi surface in CeIn$$_3$$; From localized to itinerant

Settai, Rikio*; Kubo, Tetsuo*; Matsuda, Tatsuma; Haga, Yoshinori; Onuki, Yoshichika; Harima, Hisatomo*

Physica B; Condensed Matter, 378-380, p.417 - 418, 2006/05

https://doi.org/10.1016/j.physb.2006.01.146
 Times Cited Count：7 Percentile：33.52(Physics, Condensed Matter)

We have studied a change of the Fermi surface in an antiferromagnet CeIn$$_3$$ via the de Haas-van Alphen experiment for the magnetic field along $$H$$$$||$$[100] and [111] under pressure at about 2.7 GPa. We have observed a large main spherical Fermi surface named $$a$$, which indicates that the electronic state of 4f electron in CeIn$$_3$$ changes from localized to itinerant. The cyclotron effective mass $$m^*_c$$ of this main Fermi surface is extremely enhanced: $$m^*_c$$ $$simeq$$60 $$m_0$$ at 2.75 GPa for $$H$$$$||$$[100].

Journal Articles

High pressure study on the heavy fermion superconductor CePt$$_3$$Si by AC calorimetry

Tateiwa, Naoyuki; Haga, Yoshinori; Matsuda, Tatsuma; Ikeda, Shugo; Yasuda, Takashi*; Takeuchi, Tetsuya*; Settai, Rikio*; Onuki, Yoshichika

Physica B; Condensed Matter, 378-380, p.381 - 382, 2006/05

https://doi.org/10.1016/j.physb.2006.01.472
 Times Cited Count：1 Percentile：6.03(Physics, Condensed Matter)

We have determined the pressure-temperature phase diagram of heavy-fermion superconductor CePt$$_3$$Si by the ac heat capacity measurement. The N$'e$el temperature $$T_{rm N}$$ = 2.2 K decreases with increasing pressure and becomes zero at the critical pressure $$P_{rm AF}$$ $$simeq$$ 0.6 GPa. On the other hand, the superconducting phase exists in a wider pressure region from ambient pressure to about 1.5 GPa. The phase diagram of CePt$$_3$$Si is thus very unique and has never been reported before for other heavy fermion superconductors.

Journal Articles

Hall effect in CeRh$$_2$$Si$$_2$$ through its critical pressure

Boursier, R.*; Haen, P.*; Flouquet, J.*; Haga, Yoshinori; Onuki, Yoshichika

Physica B; Condensed Matter, 378-380, p.76 - 77, 2006/05

https://doi.org/10.1016/j.physb.2006.01.168
 Times Cited Count：4 Percentile：21.42(Physics, Condensed Matter)

Hall effect on high-quality crystals of heavy-fermion antiferromagnet CeRh$$_2$$Si$$_2$$ has been measured between 1.6 and 250 K under hydrostatic pressure up to 13 kbars. Residual Hall effect at zero temperature is large, and depends strongly on pressure: it decreases continously and changes sign around the critical pressure.

Journal Articles

Unconventional superconductivity in PuRhGa$$_{5}$$; Ga NMR/NQR study

Sakai, Hironori; Tokunaga, Yo; Fujimoto, Tatsuya; Kambe, Shinsaku; Walstedt, R. E.; Yasuoka, Hiroshi; Aoki, Dai*; Homma, Yoshiya*; Yamamoto, Etsuji; Nakamura, Akio; et al.

Physica B; Condensed Matter, 378-380, p.1005 - 1006, 2006/05

https://doi.org/10.1016/j.physb.2006.01.385
 Times Cited Count：6 Percentile：29.78(Physics, Condensed Matter)

$$^{69,71}$$ Ga NMR/NQR studies have been performed on a single crystal of the transuranium superconductor PuRhGa$$_{5}$$ with $$T_{c}$$=9 K. The spin-lattice relaxation rate $$1/T_{1}$$ reveals that PuRhGa$$_{5}$$ is an unconventional superconductor having an anisotropic superconducting gap. Moreover, Korringa behavior ($$1/T_{1} T = const.$$) is observed in the normal state below 30 K. This result suggests that the superconductivity sets in after the formation of a Fermi liquid state in this compound.

26 (Records 1-20 displayed on this page)