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Journal Articles

Band structures of CeRu$$_2$$(Si$$_{1-x}$$Ge$$_{x}$$)$$_2$$ studied by resonant soft X-ray ARPES

Okane, 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.697 - 699, 2010/03

https://dx.doi.org/10.1002/pssb.200983019

Journal Articles

Fermi surface properties of YbCu$$_2$$Si$$_2$$

Matsuda, 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

https://doi.org/10.1002/pssb.200983027
 Times Cited Count：3 Percentile：16.20(Physics, Condensed Matter)

We succeeded in growing high-quality single crystals of a heavy electron compound YbCu$$_2$$Si$$_2$$. The electronic specific heat coefficient $$gamma$$ is determined to be 150 mJ/K$$^2cdot$$mol, which is consistent with the $$A$$ 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 YbCu$$_2$$Si$$_2$$ are highly different from those in a non-4$$f$$ reference compound YCu$$_2$$Si$$_2$$. From these dHvA results, the heavy electron state of YbCu$$_2$$Si$$_2$$ is characterized by the large contribution of 4$$f$$-electrons to the volume of the Fermi surface and also to the strong enhancement of effective mass caused by the spin fluctuations.

Journal Articles

Field-induced nematic phase in the spin ladder system with easy-axis anisotropy

Sakai, Toru; Tonegawa, Takashi*; Okamoto, Kiyomi*

Physica Status Solidi (B), 247(3), p.583 - 585, 2010/03

https://doi.org/10.1002/pssb.200983025
 Times Cited Count：4 Percentile：20.84(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.

Journal Articles

Diagnosis of quantum criticality by nuclear spin-echo decay method

Kambe, Shinsaku; Sakai, Hironori; Tokunaga, Yo; Chudo, Hiroyuki; Walstedt, R. E.*

Physica Status Solidi (B), 247(3), p.520 - 524, 2010/03

https://doi.org/10.1002/pssb.200983063
 Times Cited Count：2 Percentile：11.30(Physics, Condensed Matter)

In order to diagnose the quantum critical behaviour in heavy fermion systems, the Gaussian spin-spin relaxation time $$T_{2G}$$ determined by NMR spin-echo decay measurements is found to be useful. Combined with the spin-lattice relaxation time $$T_1$$, an exponent $$phi$$ of quantity $$T_1T/T_{2G}^2 sim T^{phi}$$ is predicted to be sensitive to the type of quantum criticality. In fact in heavy fermion USn$$_3$$ near the quantum critical point, $$T_1T/T_{2G}^2$$ is found to be constant as expected for the $$3D$$-SDW magnetic instability.

Oral presentation

Effect of magnetic field on antiferromagnetism in non-centrosymmetric heavy-fermion superconductor CePt$$_3$$Si

Kaneko, Koji; Stockert, O.*; Arndt, J.*; Borth, R.*; Skoulatos, M.*; Habicht, K.*; Kiefer, K.*; Schneidewind, A.*; Etzdorf, D.*; Takeuchi, Tetsuya*; et al.

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