College Park, Maryland      June 6 - 10 , 2004

MP39: Field effect and quasi-2D rod magnetic structure on electron-doped superconductor

H. Kang (Department of Physics and Astronomy, University of Tennessee), P. Dai (Department of Physics and Astronomy, University of Tennessee; Condensed Matter Sciences Division, Oak Ridge National Laboratory), Y. Ando, Y. Kurita (Electrical Physics Department, Komae Research Laboratory,CRIEPI,)

The interplay between the competing phases in high-Tc superconductivity has been one of the important issues and intensive work has been done on this topic both experimentally and theoretically. Previous field-induced effects on hole-doped LSCO suggest that antiferromagnetism competes with superconductivity. We did a similar field-induced experiment on the electron-doped superconductor PLCCO (x = 0.12) by applying a magnetic field along the c-direction to determine whether the antiferromagnetism is the competing order in high-Tc cuprates regardless hole or electron-doping. We also show that the magnetic structure of superconducting sample is quasi-2 dimensional through the result from the 2 dimensional rod scan. Comparison of the temperature dependence of the antiferromagnetic peak (0.5,0.5,0) in the superconducting sample and non-superconducting sample shows that the quasi-2dimensional magnetic structure is related to superconductivity.

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