Pressure studies on the antiferromagnetic Kondo semiconductor Ce(RuRh)Al (x = 0,0.1)

Tanida, Hiroshi*; Kitagawa, Kentaro*; Tateiwa, Naoyuki; Sera, Masafumi*; Nishioka, Takashi*

Physical Review B, 96(23), p.235131_1 - 235131_7, 2017/12

https://doi.org/10.1103/PhysRevB.96.235131

We have done high pressure experiments on Ce(RuRh)Al (x = 0 and 0.1) to study pressure-induced phase transitions from the antiferromagnetic to paramagnetic state at . Experimental data of the electrical resistivity suggest that the - hybridization gap could be not necessary to form the unusual AFM order. The pressure effects on the magnetic susceptibility is also studied. We discuss a difference in the pressure response of the magnetic susceptibility based the electronic state between x = 0 and 0.1.

Magnetic structure determination of CeAl ( = Ru and Os); Single crystal neutron diffraction studies

Kato, Harukazu*; Kobayashi, Riki; Takesaka, Tomoaki*; Nishioka, Takashi*; Matsumura, Masahiro*; Kaneko, Koji; Metoki, Naoto

Journal of the Physical Society of Japan, 80(7), p.073701_1 - 073701_4, 2011/07

https://doi.org/10.1143/JPSJ.80.073701

A Cu NQR study in a -electron heavy-fermion system, CaCuRuO

Kato, Harukazu*; Tsuruta, Takuya*; Nishioka, Takashi*; Matsumura, Masahiro*; Sakai, Hironori; Kambe, Shinsaku

Journal of Physics and Chemistry of Solids, 68(11), p.2187 - 2190, 2007/11

https://doi.org/10.1016/j.jpcs.2007.08.038

Cu nuclear quadrupole resonance (NQR) studies have been carried out for CaCuRuO,which has been suggested to show a heavy-fermion-like behavioral though it possess no f electron. A Lorentzian shape of the Cu NQR line with a narrow width implies that no magnetic ordering appears, at least, down to 5 K. The spin-lattice relaxation rate of the Cu nuclei probes a change of the Cu 3 electron nature, resulting in the Fermi liquid state at a low temperature. These facts strongly support that the heavy fermion picture is available in the concerned compound.

SR in CeRuAl

Kambe, Shinsaku; Chudo, Hiroyuki; Tokunaga, Yo; Koyama, Takehide*; Sakai, Hironori; Ito, Takashi; Ninomiya, Kazuhiko; Higemoto, Wataru; Nishioka, Takashi*; Takesaka, Tomoaki*; et al.

no journal, , 

We report zero-field SR measurements made at J-PARC on CeRuAl. Below the phase transition temperature K, a clear modulation of polarization due to an internal field is observed, indicating that magnetic ordering takes place. Compared with the internal field expected from the effective magnetic moment in the disordered state, the observed internal field at the site is quite small. This indicates that the ordered Ce magnetic moment is small () and/or the nearest pair of Ce magnetic moments are mutually anti-parallel. The -dependence of the internal field is somewhat peculiar, suggesting that another ordering is taking place as well.

Rh substitution effect of Ru-site for single crystals of CeRuAl

Kobayashi, Riki; Kawamura, Yukihiro*; Nishioka, Takashi*; Kato, Harukazu*; Matsumura, Masahiro*; Matsubayashi, Kazuyuki*; Uwatoko, Yoshiya*; Kaneko, Koji

no journal, , 

no abstracts in English

Elucidation of high ordering temperature in CeRuAl using Rh substitution

Kobayashi, Riki; Kaneko, Koji; Wakimoto, Shuichi; Haga, Yoshinori; Matsuda, Tatsuma; Yamamoto, Etsuji; Robert, J.*; Mignot, J.-M.*; Andr, G.*; Matsuda, Masaaki*; et al.

no journal, , 

no abstracts in English

Distribution measurement at microlevel of Cs chemisorbed compounds onto stainless steel under LWR severe accident

Suzuki, Eriko; Ogawa, Hiroaki; Nakajima, Kunihisa; Nishioka, Shunichiro; Osaka, Masahiko; Yamashita, Shinichiro; Kurishiba, Ryoko*; Endo, Takashi*; Isobe, Shigehito*; Hashimoto, Naoyuki*

no journal, , 

To elucidate Cs chemisorption behaviour onto stainless steel under LWR severe accident condition, elemental distribution measurement at microlevel was performed by using XPS and TEM. As a result, it was found that Cs-(Fe)-Si-O compounds, which have different composition, could be distributed.