Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
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：2 Percentile：12.12(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.
SiNguyen, D.; Matsuda, Tatsuma; Ikeda, Shugo*; Yamamoto, Etsuji; Haga, Yoshinori; Takeda, Yuji*; Endo, Toyoaki*; Doi, Yusuke*; Settai, Rikio*; Harima, Hisatomo*; et al.
Journal of the Physical Society of Japan, 77(9), p.094702_1 - 094702_6, 2008/09
Times Cited Count：15 Percentile：64.38(Physics, Multidisciplinary)We have succeeded in growing a high-quality single crystal of a non-4 reference compound YCuSi for a heavy-fermion superconductor CeCuSi, and observed the de Haas-van Alphen (dHvA) oscillation. The detected dHvA branches in YCuSi indicate that the Fermi surfaces are multiply connected, and the dHvA frequencies are in the range from 9
to 2
Oe. These dHvA branches are found to be well explained by the results of energy band calculations. The corresponding cyclotron masses are light, ranging from 0.4 to 1.5 
, and are consistent with the electronic specific heat coefficient of 2.2 mJ/Kmol.
Rh
Ga
with quasi-two-dimensional electronic stateNguyen, D.; Matsuda, Tatsuma; Haga, Yoshinori; Ikeda, Shugo*; Yamamoto, Etsuji; Endo, Toyoaki*; Settai, Rikio*; Harima, Hisatomo*; Onuki, Yoshichika
Journal of the Physical Society of Japan, 77(6), p.064708_1 - 064708_6, 2008/06
Times Cited Count：1 Percentile：11.66(Physics, Multidisciplinary)We succeeded in growing a single crystal of a layered compound LuRhGa with an YCoGa-type orthorhombic crystal structure by the Ga-flux method. The lattice, positional, and thermal parameters were determined by single-crystal X-ray diffraction measurement. We also measured the electrical resistivity, specific heat, and de Haas-van Alphen (dHvA) effect. The detected dHvA branches were well explained by the results of full potential LAPW energy band calculations. The electronic state was found to be quasi-two-dimensional, indicating nearly cylindrical Fermi surfaces along the [001] direction.
(T:transition metal) and PrCoGe with the non-centrosymmetric crystal structureKawai, Tomoya*; Muranaka, Hiroshi*; Endo, Toyoaki*; Nguyen, D.; Doi, Yusuke*; Ikeda, Shugo*; Matsuda, Tatsuma; Haga, Yoshinori; Harima, Hisatomo*; Settai, Rikio*; et al.
Journal of the Physical Society of Japan, 77(6), p.064717_1 - 064717_15, 2008/06
Times Cited Count：44 Percentile：83.61(Physics, Multidisciplinary)Fermi surfaces of the non-centrosymmetric LaTGe and PrCoGe have been studied in detail using the de Haas-van Alphen effect. Splitting of the conduction bands due to the spin-orbit interaction was clearly observed. These results are important in understanding the exotic superconductivity realized in non-centrosymmetric structure.
