Transport and NQR Studies of Nd_<1.6-x>Ce_xSr_<0.4>CuO_4 with T^* Structure

概要

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Transport and Cu-NQR studies have been carried out for the T^*-type high temperature superconducting Cu oxide Nd_<1.6-x>Ce_xSr_<0.4>CuO_4 with single layered CuO_2 planes formed by CuO_5 pyramids. No anomaly related to the static or quasi static "stripe" order has been observed in the temperature T and x dependence of the thermoelectric powers S. We have not found such kind of anomaly in the x dependence of the superconducting transition temperature T_c, either. Although the decrease of the Cu NQR intensity with decreasing T (wipeout) has been observed in this system, it can be understood by considering the loss of the itinerant nature of the electrons, which takes place in the proximity region of the metal-insulator phase boundary, and cannot be connected with the static or quasi static "stripe" order.
社団法人日本物理学会の論文
2002-02-15