Dimensional 3D-2D cross-over under magnetic field in Bi2Sr2-xLaxCuOy induced by La/Sr substitution

作者：Murrills C D^*; Li Z Z; Raffy H

来源：Superconductor Science and Technology, 2015, 28(6): 065010.

DOI：10.1088/0953-2048/28/6/065010

• superconducting thin films
• hole-doped cuprates
• vortex phases
• transport properties

The single CuO2 layer Bi2Sr2CuO6 (Bi-2201) is characterized by a low anisotropy under magnetic field. We show that this anisotropy increases exponentially from 4 to 400 with La/Sr substitution in Bi(2)Sr(2-x)La(x)Cu0(6) (Bi(La)-2201). We present a phase diagram showing the change in transport properties from 3D to 2D when the La concentration is increased, deduced from angular transport measurements in the mixed state of c-axis oriented epitaxial Bi(La)-2201 thin films with columnar pinning centers parallel to the c-axis. We attribute this anisotropy increase to the decrease of the distortion of CuO2 planes by La/Sr substitution.

• 出版日期2015-6