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Dresden 2009 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 33: Postersession Correlated Electrons: Metal Insulator Transition, Spin Systems and Itinerant Magnets

TT 33.9: Poster

Wednesday, March 25, 2009, 14:00–18:00, P1A

Doping dependence of stripe order in La2−xSrxNiO4+δ — •Christoph Trabant1, Hsueh-Hung Wu1,2, Marcel Buchholz1, Enrico Schierle3, Mohammed Benomar1, Agung Nugroho4, Alexander Komarek1, Ralf Feyerherm3, Markus Braden1, Liu Hao Tjeng1, and Christian Schüßler-Langeheine11II. Physikalisches Institut, Universität zu Köln — 2NSRRC, Hsinchu, Taiwan — 3Helmholtz-Zentrum Berlin — 4Bandun University, Indonesia

Stripe order in La2−xSrxNiO4+δ with a doping level nh=x+2δ between 0.2 and 0.33 exhibits an unusual temperature dependence of the correlation length, which goes through a maximum at intermediate temperatures and decreases not only upon heating but also upon cooling. While the integrated intensity of the charge and spin order peak is conserved, the system breaks into smaller and smaller domains when cooled.

We studied this behavior as a function of Sr and oxygen content using resonant diffraction at the Ni 2p → 3d (L2,3) and 1s → 4p (K) thresholds. The goal is to understand the mechanism for the low-temperature broadening. Differences between commensurate and incommensurate order as well as the effect of the oxygen content will be discussed.

Supported by the DFG through SFB 608 and by the BMBF through 05 ES3XBA/5.

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