We measured the electrical resistivity of La1.85 Sr0.15 Cu1-y Zny O4 (y=0,0.004,0.008,0.017) single crystals to study the magnetic-field dependence of the superconducting transitions. For y=0∼0.008, as the magnetic field along the c axis is increased, the superconducting transition significantly broadens while the onset Tc remains unchanged in both the in-plane resistivity ρab and the out-of-plane resistivity ρc. This corresponds to the so-called broadening behavior. For y=0.017, the onset Tc is apparently reduced with increasing the magnetic field, which we define as a parallel shift. This indicates that the in-plane superconducting coherence length drastically increases at y=0.017. We discuss these Zn-doping effects based on an inhomogeneous picture.
|ジャーナル||Physical Review B - Condensed Matter and Materials Physics|
|出版ステータス||Published - 2009 5 1|
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