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Transport properties of single-crystalline Cu_xTiSe_2 (0.015 ≤ x ≤ 0.110)

机译:单晶Cu_xTiSe_2(0.015≤x≤0.110)的传输性质

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Transport properties are systematically studied for single crystals of Cu_xTiSe_2 (0.015 ≤ x ≤ 0.110). Both the in-plane and out-of-plane resistivity show a wide peak due to charge density waves (CDWs) for single crystals with x ≤ 0.025. After the 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. The anisotropy in the resistivity increases with increasing Cu content, and is nearly T independent. The CDW state has a strong effect on the Hall coefficient and thermopower. Large thermopower, comparable to that of the triangular lattice Na_xCoO_2, is observed in Cu_xTiSe_2. Intercalation of Cu induces a negative magnetoresistance due to the interaction between conducting carriers and localized magnetic moments.
机译:系统地研究了Cu_xTiSe_2(0.015≤x≤0.110)单晶的传输性质。由于x≤0.025的单晶的电荷密度波(CDW),面内和面外电阻率均显示出较宽的峰值。在将CDW状态完全抑制在x = 0.055附近后,Cu掺杂明显增强了超导性。对于Cu_(0.11)TiSe_2,在1.8 K以上没有观察到超导转变。电阻率的各向异性随Cu含量的增加而增加,并且几乎与T无关。 CDW状态对霍尔系数和热功率有很大影响。在Cu_xTiSe_2中观察到与三角形格Na_xCoO_2相当的大热能。由于导电载流子和局部磁矩之间的相互作用,Cu的插入感应出负的磁阻。

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