Magnetic properties and enhanced thermoelectric performance in Cu-doped Ca 3 Co 2 O 6 single crystals
作者： Jiyue Song , Bangchuan Zhao , Yanan Huang , Yanfeng Qin , Wenhai Song
DOI: 10.1016/J.CAP.2017.02.008
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摘要: Abstract The effect of Cu doping on the structural, magnetic, electrical and thermal transport properties Ca3Co2-xCuxO6 single crystals has been investigated systematically. Based analysis structural parameter x-ray photoelectron spectroscopy spectra, valence state is considered to be +2. All samples undergo a long-range spin density wave (SDW) transition at TN glass-like magnetic Tf with decreasing temperature. Both decrease monotonously increasing Cu-doping content. A series magnetization steps can be observed in M(H) curve Ca3Co2O6, are sensitive sample cooling field content x. With increase x, resistivity along c-axis decreases while thermopower increases. As result, figure merit (ZT) increases considerably room-temperature ZT value x = 0.6 nearly 60 times larger than that un-doped crystal.
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