Evidence of coherent c-axis charge transport in underdoped La2−xSrxCuO4 superconductors
Y. H. Kim, P. H. Hor, X. L. Dong, F. Zhou, Z. X. Zhao, Z. Wu, J. W. Xiong
DOI 10.1103/PhysRevB.71.092508 · Physical Review B
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Abstract
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 (Γc) is surprisingly small, Γc=13±2cm−1 for x=0.07 and Γc=24±1cm−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 Γc 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | Pressure not reported | unknown |
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 28 | Pressure not reported | unknown |
| Tl2Ba2CuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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