Evidence of Coherent C-Axis Charge Transport in Underdoped La2-xSrxCuO4 Superconductors

Details Evidence of Coherent C-Axis Charge Transport in Underdoped La2-xSrxCuO4 Superconductors Evidence of Coherent C-Axis Charge Transport in Underdoped La2-xSrxCuO4 Superconductors

2004-06-08

arxiv.org/abs/cond-mat/0406179v4

PRB71, 092508(2005)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures. to appear in PRB71

Scientific paper

10.1103/PhysRevB.71.092508

We have observed the plasma edge in the normal state c-axis far-infrared (far-IR) reflectivity of La2-xSrxCuO4 (LSCO) single crystals at an unlikely Sr-doping concentration x = 0.07 but not in x = 0.09. We find that the c-axis scattering rate (Gc) is surprisingly small, Gc = 13 (+_) 2 cm-1 for x = 0.07 and Gc = 24 (+_) 1 cm-1 for x = 0.09 and nearly temperature independent but increases linearly with doping up to x = 0.16. We suggest that the apparent absence of the normal state plasma edge in the previous measurements is due to the larger Gc than the screened plasma frequency of the coherent free carriers. We conclude that the c-axis charge transport in LSCO in the underdoped regime is intrinsically coherent.

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