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Journal Articles

Huge upper critical field in the superconductor with non-centrosymmetric crystal structure CeCoGe$$_3$$

M$'e$asson, M.-A.*; Muranaka, Hiroshi*; Matsuda, Tatsuma; Kawai, Tomoya*; Haga, Yoshinori; Knebel, G.*; Aoki, Dai*; Lapertot, G.*; Honda, Fuminori*; Settai, Rikio*; et al.

Physica C, 470(Suppl.1), p.S536 - S538, 2010/12

https://doi.org/10.1016/j.physc.2009.11.013
 Times Cited Count：4 Percentile：21.96(Physics, Applied)

Journal Articles

Superconductivity in CeIrSi$$_3$$ realized at the quantum critical point

Settai, Rikio*; Kawai, Tomoya*; Miyauchi, Yuichiro*; Okuda, Yusuke*; Onuki, Yoshichika; Takeuchi, Tetsuya*; Tateiwa, Naoyuki; Matsuda, Tatsuma; Haga, Yoshinori; Harima, Hisatomo*

Kotai Butsuri, 43(8), p.459 - 474, 2008/08

http://ci.nii.ac.jp/naid/40016234247

The magnetic transition temperature of an antiferromagnet CeIrSi$$_3$$ decreases with increasing hydrostatic pressure, and finally superconductivity appears. An exotic superconducting symmetry is expected because of the absence of the inversion center in the crystal structure. One of the prominent features is the anomalously large upper critical field observed around the quantum critical point.

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：89.17(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：44 Percentile：83.61(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.

Journal Articles

Magnetic and electrical properties in CePtSi$$_{3}$$ without inversion symmetry in the crystal structure

Kawai, Tomoya*; Okuda, Yusuke*; Shishido, Hiroaki*; Thamizhavel, A.*; Matsuda, Tatsuma; Haga, Yoshinori; Nakashima, Miho*; Takeuchi, Tetsuya*; Hedo, Masato*; Uwatoko, Yoshiya*; et al.

Journal of the Physical Society of Japan, 76(1), p.014710_1 - 014710_6, 2007/01

https://doi.org/10.1143/JPSJ.76.014710
 Times Cited Count：22 Percentile：71.06(Physics, Multidisciplinary)

We succeeded in growing a single crystal of CePtSi$$_{3}$$ by the Sn-flux method. CePtSi$$_{3}$$ is found to be an antiferromagnet with two transitions at 4.8 and 2.4 K. Magnetic easy direction was [100] direction with an ordered moment of 1.15 $$mu_{rm B}$$/Ce. The anisotropy is similar to that of CeIrSi$$_{3}$$ in which the pressure-induced superconductivity was observed.

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