Physics – Condensed Matter – Superconductivity
Scientific paper
2011-07-27
Physics
Condensed Matter
Superconductivity
4 pages, 4 figures + supplementary material
Scientific paper
The electrical resistivity rho_c of the underdoped cuprate superconductor YBCO was measured perpendicular to the CuO2 planes on ultra-high quality single crystals in magnetic fields large enough to suppress superconductivity. The incoherent insulating-like behavior of rho_c at high temperature, characteristic of all underdoped cuprates, is found to cross over to a coherent regime of metallic behavior at low temperature. This crossover coincides with the emergence of the small electron pocket detected in the Fermi surface of YBCO via quantum oscillations, the Hall and Seebeck coefficients and with the detection of a unidirectional modulation of the charge density as seen by high-field NMR measurements. The low coherence temperature is quantitatively consistent with the small hopping integral inferred from the splitting of the quantum oscillation frequencies. We conclude that the Fermi-surface reconstruction in YBCO at dopings from p = 0.08 to at least p = 0.15, attributed to stripe order, produces a metallic state with 3D coherence deep in the underdoped regime.
Bonn Douglas A.
Day James
Hardy Walter N.
LeBoeuf David
Lepault Stephane
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