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Yasuoka, Hiroshi; Koutroulakis, G.*; Chudo, Hiroyuki; Tobash, P. H.*; Richmond, S.*; Bauer, E. D.*; Ronning, F.*; Thompson, J. D.*; Clark, D. L.*
no journal, ,
Kaneko, Koji; Raymond, S.*; Hiess, A.*; Fk, B.*; Steffens, P.*; Lapertot, G.*; Settai, Rikio*; Onuki, Yoshichika
no journal, ,
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 CePtIn
and URu
Si
.
Okane, Tetsuo
no journal, ,
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, which has the tetragonal HoCoGa
structure and exhibits two antiferromagnetic (AF) transitions at
=36.2 K and
=5.4 K. From analysis of the internal fields at Ga sites, we have determined the magnetic structures of the AF-I (
) and the AF-II (
) 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
=[1/2, 0, 1/2] and
=[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.
Tateiwa, Naoyuki
no journal, ,
The pressure dependent electrical resistivity of URuSi
has been studied at high pressure across the first order phase boundary of
where the ground state switches under pressure from "hidden order" (HO) to large moment antiferromagnetic (LAFM) states. The analysis using the polynomial in
expression
reveals the relation
in the HO phase. While the pressure dependence of
is very weak,
is roughly proportional to
. 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.
Haga, Yoshinori
no journal, ,
Suzuki, Michito
no journal, ,
no abstracts in English