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Oral presentation

NMR/NQR study on the superconductivity and magnetism of Pu compounds

Yasuoka, Hiroshi; Koutroulakis, G.*; Chudo, Hiroyuki; Tobash, P. H.*; Richmond, S.*; Bauer, E. D.*; Ronning, F.*; Thompson, J. D.*; Clark, D. L.*

no journal, , 

Oral presentation

Effect of magnetic field on magnetic excitation in heavy-fermion superconductors probed via neutron scattering

Kaneko, Koji; Raymond, S.*; Hiess, A.*; F${aa}$k, B.*; Steffens, P.*; Lapertot, G.*; Settai, Rikio*; Onuki, Yoshichika

no journal, , 

Oral presentation

Our recent progress of NMR measurements under extreme conditions; Our NMR research activity in ASRC-JAEA

Sakai, Hironori; Tokunaga, Yo; Kambe, Shinsaku

no journal, , 

The activity, facility and scientific aim of research group for Condensed Matter Physics of heavy elements systems will be summarized. In addition, recent our results on a correlation between superconductivity and anisotropy of magnetic fluctuations will be discussed. Our recent collaborative works with Los Alamos National Laboratory and National High Magnetic Field Laboratory in U.S.A. will be also reported along the two topics regarding CePt$$_2$$In$$_7$$ and URu$$_2$$Si$$_2$$.

Oral presentation

Non-collinear antiferromagnetic structure in TbCoGa$$_5$$

Tokunaga, Yo; Saito, Yo*; Sakai, Hironori; Kambe, Shinsaku; Sanada, Naoyuki*; Watanuki, Ryuta*; Suzuki, Kazuya*; Kawasaki, Yu*; Kishimoto, Yutaka*

no journal, , 

We report NMR studies of TbCoGa$$_5$$, which has the tetragonal HoCoGa$$_5$$ structure and exhibits two antiferromagnetic (AF) transitions at $$T_{N1}$$=36.2 K and $$T_{N2}$$=5.4 K. From analysis of the internal fields at Ga sites, we have determined the magnetic structures of the AF-I ($$T_{N2}<T<T_{N1}$$) and the AF-II ($$T<T_{N2}$$) phases. The AF-I phase is a collinear AF order with the propagation vector q=[1/2, 0, 1/2] and with ordered moments parallel to the c axis. This is in accordance with the neutron diffraction measurements. In the AF-II phase, on the other hand, we found a non-collinear AF structure described with double propagation vectors $$q_1$$=[1/2, 0, 1/2] and $$q_2$$=[0, 1/2, 1/2]. Interestingly, the NMR reveals that the c component of the Tb moments does not change value between the AF-I and the AF-II phases, even though an a component is newly developed in the AF-II phase.

Oral presentation

Strong correlation between anomalous quasiparticle scattering and superconductivity in hidden order phase of URu$$_2$$Si$$_2$$

Tateiwa, Naoyuki

no journal, , 

The pressure dependent electrical resistivity of URu$$_2$$Si$$_2$$ has been studied at high pressure across the first order phase boundary of $$P_x$$ where the ground state switches under pressure from "hidden order" (HO) to large moment antiferromagnetic (LAFM) states. The analysis using the polynomial in $$T$$ expression $${rho}{,}={,}{rho_0}+{,}{{alpha}_1}T+{,}{{alpha}_2}T{^2}$$ reveals the relation $${{alpha}_1}/{{alpha}_2}$$ $$propto$$ $$T_{sc}$$ in the HO phase. While the pressure dependence of $${{alpha}_2}$$ is very weak, $${{alpha}_1}$$ is roughly proportional to $$T_{sc}$$. This suggests a strong correlation between the anomalous quasiparticle scattering and the superconductivity and that both have a common origin. The present study clarifies a universality of the HO phase inherent in strongly correlated electron superconductors near quantum criticality.

Oral presentation

Oral presentation

First principle study of multipole ordered states in URu$$_2$$Si$$_2$$

Suzuki, Michito

no journal, , 

no abstracts in English

Oral presentation

Delocalization of the f electron in Ce$$_x$$La$$_{1-x}$$Ru$$_2$$Si$$_2$$

Matsumoto, Yuji

no journal, , 

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