Physics – Condensed Matter – Superconductivity
Scientific paper
2010-10-05
Solid State Communications 150, 2314-2317 (2010)
Physics
Condensed Matter
Superconductivity
14 pages, 3 figures. Accepted for the publication in Solid State Communications
Scientific paper
Coexistence of the "metallic-like" in-plane and the "semiconducting-like" out-of-plane (caxis) dc conductivities ({\sigma}c), generating a huge anisotropy in the underdoped hightemperature cuprate superconductors (HTCS), defies our current understanding of metal. In this report we present an intrinsic doping dependence of {\sigma}c. We find that the {\sigma}c for the underdoped HTCS is universally scaled to the {\sigma}c at the optimal doped-hole concentration. The universal scaling behavior suggests that there are three intrinsic processes contribute to {\sigma}c: (i) the doping-dependent-activated gap; (ii) the exponential doping dependences and (iii) the tunneling between adjacent CuO2 block layers. They are the essential underlying characteristics of the c-axis transport for all HTCSs.
Honma Tatsuya
Hor Pei Herng
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