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Journal Articles

The de Haas-van Alphen oscillation and fermi surface properties of YCu$$_2$$Si$$_2$$

Nguyen, 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

https://doi.org/10.1143/JPSJ.77.094702
 Times Cited Count：15 Percentile：64.28(Physics, Multidisciplinary)

We have succeeded in growing a high-quality single crystal of a non-4$$f$$ reference compound YCu$$_2$$Si$$_2$$ for a heavy-fermion superconductor CeCu$$_2$$Si$$_2$$, and observed the de Haas-van Alphen (dHvA) oscillation. The detected dHvA branches in YCu$$_2$$Si$$_2$$ indicate that the Fermi surfaces are multiply connected, and the dHvA frequencies are in the range from 9$$times10^6$$ to 2$$times10^8$$ 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 $$m_0$$, and are consistent with the electronic specific heat coefficient of 2.2 mJ/K$$^2cdot$$mol.

Journal Articles

Magnetic and superconducting properties of CeTX$$_3$$ (T:transition metal and X:Si and Ge) with non-centrosymmetric crystal structure

Kawai, Tomoya*; Muranaka, Hiroshi*; M$'e$asson, M.-A.*; Shimoda, Tetsuya*; Doi, Yusuke*; Matsuda, Tatsuma; Haga, Yoshinori; Knebel, G.*; Lapertot, G.*; Aoki, Dai*; et al.

Journal of the Physical Society of Japan, 77(6), p.064716_1 - 064716_9, 2008/06

https://doi.org/10.1143/JPSJ.77.064716
 Times Cited Count：67 Percentile：89.27(Physics, Multidisciplinary)

Physical properties of cerium compounds CeTX$$_3$$ were studied on single crystals. Electrical resistivity, magnetization as well as their pressure dependence revealed that the antiferromagnetism of CeCoGe$$_3$$ is destroyed under hydrostatic pressure above 5.4 GPa and the superconductivity appears above this pressure.

Journal Articles

Split Fermi surface properties of LaTGe$$_3$$ (T:transition metal) and PrCoGe$$_3$$ with the non-centrosymmetric crystal structure

Kawai, 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

https://doi.org/10.1143/JPSJ.77.064717
 Times Cited Count：45 Percentile：84.20(Physics, Multidisciplinary)

Fermi surfaces of the non-centrosymmetric LaTGe$$_3$$ and PrCoGe$$_3$$ 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.

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