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Sakai, Toru; Tonegawa, Takashi*; Okamoto, Kiyomi*
Physica Status Solidi (B), 247(3), p.583 - 585, 2010/03
Times Cited Count：4 Percentile：21.22(Physics, Condensed Matter)The spin ladder system with the easy-axis anisotropy in magnetic field is theoretically investigated using the numerically exact diagonalization, the density matrix renormalization group (DMRG) and the finite-size scaling analysis. It is found that the field-induced nematic phase appears above the critical field. In addition, there exists another critical field at which the quantum phase transition from the nematic phase to the conventional field-induced Tomonaga- Luttinger liquid phase occurs. The phase diagram on the coupling anisotropy versus magnetization plane is given by the numerical diagonalization. Furthermore, a typical magnetization curve calculated by the DMRG is presented.
Kambe, Shinsaku; Sakai, Hironori; Tokunaga, Yo; Chudo, Hiroyuki; Walstedt, R. E.*
Physica Status Solidi (B), 247(3), p.520 - 524, 2010/03
Times Cited Count：2 Percentile：11.51(Physics, Condensed Matter)In order to diagnose the quantum critical behaviour in heavy fermion systems, the Gaussian spin-spin relaxation time 
determined by NMR spin-echo decay measurements is found to be useful. Combined with the spin-lattice relaxation time 
, an exponent 
of quantity 
is predicted to be sensitive to the type of quantum criticality. In fact in heavy fermion USn
near the quantum critical point, 
is found to be constant as expected for the 
-SDW magnetic instability.
(Si
Ge
) studied by resonant soft X-ray ARPESOkane, Tetsuo; Okochi, Takuo*; Takeda, Yukiharu; Fujimori, Shinichi; Yasui, Akira; Saito, Yuji; Yamagami, Hiroshi; Fujimori, Atsushi; Matsumoto, Yuji*; Sugi, Motoki*; et al.
Physica Status Solidi (B), 247(3), p.397 - 399, 2010/03
SiMatsuda, Tatsuma; Dung, N. D.*; Haga, Yoshinori; Ikeda, Shugo*; Yamamoto, Etsuji; Ishikura, Tatsuro*; Endo, Toyoaki*; Takeuchi, Tetsuya*; Settai, Rikio*; Onuki, Yoshichika
Physica Status Solidi (B), 247(3), p.757 - 759, 2010/03
Times Cited Count：3 Percentile：16.49(Physics, Condensed Matter)We succeeded in growing high-quality single crystals of a heavy electron compound YbCuSi. The electronic specific heat coefficient 
is determined to be 150 mJ/K
mol, which is consistent with the 
value of the electrical resistivity from Kadowaki-Woods relation. We succeeded in observing the de Haas-van Alphen (dHvA) oscillations. The dHvA frequencies and large cyclotron effective masses in YbCuSi are highly different from those in a non-4
reference compound YCuSi. From these dHvA results, the heavy electron state of YbCuSi is characterized by the large contribution of 4-electrons to the volume of the Fermi surface and also to the strong enhancement of effective mass caused by the spin fluctuations.
SiKaneko, Koji; Stockert, O.*; Arndt, J.*; Borth, R.*; Skoulatos, M.*; Habicht, K.*; Kiefer, K.*; Schneidewind, A.*; Etzdorf, D.*; Takeuchi, Tetsuya*; et al.
no journal, ,
