Transport properties in Cu x TiSe 2 (0.015 ≤ x ≤ 0.110) Single Crystal
G. Wu, H. X. Yang, L. Zhao, X. G. Luo, T. Wu, G. Y. Wang, X. H. Chen
Abstract
Transport properties are systematically studied for the single crystals Cu
x
TiSe
2
(0.015
≤
x
≤
0.110). Both of in-plane and out-of-plane resistivity show the coexistence of superconducting transition and charge density wave (CDW) for the single crystals with
x≤0.025
. After CDW state is completely suppressed around x=0.055, the superconductivity is apparently enhanced by Cu doping. No superconducting transition is observed above 1.8 K for Cu
0.11
TiSe
2
. Anisotropy in resistivity increases with increasing Cu content, and is nearly
T
-independent. CDW state has a strong effect on Hall coefficient and thermopower. A large thermopower, comparable to the triangle lattice
NaxCo
O
2
, is observed in Cu
x
TiSe
2
. Intercalation of Cu induces a negative MR due to the interaction between conducting carries and localized magnetic moments.