Possible d+id scenario in La_{2-x}Sr_{x}CuO_4 by point-contact measurements

Details Possible d+id scenario in La_{2-x}Sr_{x}CuO_4 by point-contact measurements Possible d+id scenario in La_{2-x}Sr_{x}CuO_4 by point-contact measurements

2002-07-17

arxiv.org/abs/cond-mat/0207411v2

Int. J. Mod. Phys. B 17, 649 (2003)

Physics

Condensed Matter

Superconductivity

6 pages, 4 eps figures, presented at SATT11 Conference (Vietri sul Mare, March 2002). To appear in Int. J. Mod. Phys

Scientific paper

10.1142/S0217979203016376

We analyze the results of point-contact measurements in La_{2-x}Sr_{x}CuO_{4} (LSCO) previously reported as a clear evidence of the separation between gap and pseudogap in this copper oxide. Here we show that, in addition to this, the conductance curves of our point-contact junctions -- showing clear Andreev reflection features -- can be interpreted as supporting a nodeless d_{x^2-y^2}+id_{xy}-wave symmetry of the gap in LSCO. The results of our analysis, in particular the doping dependence of the subdominant d_{xy} gap component, are discussed and compared to the predictions of different theoretical models.

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