Two dimensional (2D) layered transition metal dichalcogenide (MX₂) is one of interesting materials because of their unusual physical properties such as charge density wave (CDW) [1] and superconductivity [2,3]. In particular, MX₂ compound also has a Van Der Waals gap between layers so that the intercalation or doping of cation dopant can be efficiently considered and studied. Among 4d transition MX₂ compounds, CdI₂-type PdTe₂ compound is very attractive due to the peculiar electronic structure, in which the Fermi level (E_F) locates at the valley of density of states [4]. Superconducting transition temperature T_c in BCS-type superconductors dominantly depends on the carrier density at around E_F as one of main factors. Herein, we report superconductivity in Cu_xPdTe₂ single crystal with the large size of ~1´1.8cm², which is successfully synthesized by the conventional self-flux method as well as the vertical Bridgman method. Enhanced superconducting T_c from 1.7 to 2.6K is obtained by the carrier introduced in Cu_xPdTe₂ as defined in the electro-magnetic and Hall measurements. These results obviously indicate that Cu_xPdTe₂ compound could be considered as a new example of carrier modulated MX₂ superconductor like the intercalated or electric field induced MoS₂ superconductors with superconducting T_c depending on the carrier density at E_F [2].

References

[1] E. Morosan, H. W. Zandbergen, B. S. Dennis, J. W. G. Bos, Y. Onose, T. Klimczuk, A. P. Ramirez, N. P. Ong and R. J. Cava, Nature, 2(2006)544

[2] J. Y. Ye, Y. J. Zang, R. Akashi, M. S. Bahramy and Y. Iwasa, Science, 338(2012)1193

[3] Y. Qi, S. Matsuishi, J. Guo, h. Mizoguchi and H. Hosono, Phys. Rev. Lett. 109(2012) 217002

[4] H. W. Myron, Solid State Commun. 15(1974) 395

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