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Dresden 2003 – scientific programme

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TT: Tiefe Temperaturen

TT 7: Niedrigdimensionale Systeme

TT 7.2: Talk

Tuesday, March 25, 2003, 10:00–10:15, HSZ03

Structural Properties of the Spin Ladder and Chain Compound Sr14Cu24O41 — •M. v. Zimmermann1, J. Geck2, S. Kiele1,2, R. Klingeler2, and B. Büchner21Hamburger Synchrotronstrahlungslabor HASYLAB at Deutsches Elektronen Synchrotron DESY, Notkestr. 85, 22603 Hamburg, Germany — 2II. Physikalisches Institut / Lehrstuhl A, RWTH Aachen, Huyskensweg, 52056 Aachen, Germany

Spin chain and ladder materials are an exciting class of compounds since the basic structural unit is similar to high-Tc superconductors. While in the superconductors CuO4 plaquttes form a 2-dimensional network, in ladders and chains materials they compose 1-dimensional arrays. Sr14Cu24O41 is one such material that exhibits both chains and ladders in subsequent layers and is particular exciting since it also shows superconductivity under pressure at a certain doping level. The average valence state of Cu in Sr14Cu24O41 is 2.25 and the insulating ground state indicates that the holes are localized. A charge valence ordering at a temperature around 200 K is claimed by many different experimental techniques. However, the correlation of the holes is still uncertain. We have characterized a single crystal of Sr14Cu24O41 with high energy (100 keV) x-ray diffraction, and find a strong incommensurate modulation. We will show how this modulation is related to charge ordering and discuss its consequences to the inter-chain correlation.

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