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Berlin 2008 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 32: Correlated Electrons: Poster Session

TT 32.56: Poster

Thursday, February 28, 2008, 14:00–18:00, Poster B

Electrical transport measurements in the Ca-doped ladders Sr14−xCaxCu24O41 — •M. E. Navarro Fuentes1, A. Narduzzo1, H. ElHaes2, P. Ribeiro1, C. Hess1, B. Büchner1, U. Ammerahl3, and A. Revcolevschi31IFW Dresden, Germany — 2RWTH Aachen, Germany — 3Université Paris-Sud, Orsay, France.

We report on measurements of electrical resistivity in the Ca-doped spin ladders Sr14−xCaxCu24O41 (0<x<12) in the temperature range 6K<T<300K. The resistivities along the ladders (ρc) and perpendicular to them (ρa) decrease by two and one order of magnitude respectively upon Ca-doping; ρc in particular displays a crossover from insulating to metallic behavior for x>11. While this insulator to metal crossover represents an interesting and as yet unresolved issue in its own right (as both the spin and the itinerant hole systems are arguably in a state of intermediate dimensionality between 2 and 3) its understanding may ultimately shed light on the conundrum the physics of high-temperature superconductors represents. We present an interpretation of the observed results in the light of existing theoretical frameworks.

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