Magnetoresistance of Junctions made of Underdoped YBCO Separated by a Ga-doped YBCO Barrier

Details Magnetoresistance of Junctions made of Underdoped YBCO Separated by a Ga-doped YBCO Barrier Magnetoresistance of Junctions made of Underdoped YBCO Separated by a Ga-doped YBCO Barrier

2005-02-10

arxiv.org/abs/cond-mat/0502254v1

Physics

Condensed Matter

Superconductivity

5 figures, accepted for publication in Physical Review B

Scientific paper

10.1103/PhysRevB.71.134502

We report magnetoresistance measurements of ramp type superconductor-normal-superconductor (SNS) junctions. The junctions consist of underdoped $YBa_{2}Cu_{3}O_y$ (YBCO) electrodes separated by a barrier of $YBa_{2}Cu_{2.6}Ga_{0.4}O_y$. We observe a large positive magnetoresistance, linear in the field. We suggest that this unusual magnetoresistance originates in the field dependence of the proximity effect. Our results indicate that in underdoped YBCO/N/YBCO SNS structures, the proximity effect does not exhibit the anomalously long range found in optimally doped YBCO structures. From our data we obtain the diffusion coefficient and relaxation time of quasiparticles in underdoped YBCO.

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