Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 45: Correlated Electrons: Poster Session

TT 45.40: Poster

Donnerstag, 29. März 2012, 15:00–19:00, Poster B

X-ray Photon Correlation Spectroscopy Study of Phase Separation in Correlated Oxides — •Marcel Buchholz¹, Bo Shi², Christoph Trabant^1,3, Chun-Fu Chang^1,4, Michael Sprung⁵, Vasco Tenner², Christian Gutt⁵, Alexander Komarek^1,4, Enrico Schierle³, Gerhard Grübel⁵, Markus Braden¹, Jeroen B. Goedkoop², and Christian Schüßler-Langeheine^3,1 — ¹II. Physikalisches Institut, Universität zu Köln — ²Van der Waals-Zeeman Instituut, Universiteit van Amsterdam — ³Helmholtz-Zentrum Berlin — ⁴MPI Chemische Physik fester Stoffe, Dresden — ⁵Deutsches Elektronen-Synchrotron, Hamburg

In systems with complex phase diagrams phase separation and phase coexistence may occur. Such effects lead to an involved relation between local electronic structure and macroscopic properties and may cause a high susceptibility of the latter to external stimuli. Phase separation has in fact been proposed as the mechanism leading to the colossal magnetoresistance effect in manganites. We report results from a study of phase separation effects in correlated oxides with x-ray photon correlation spectroscopy (XPCS). This technique provides a sensitivity to the local structure as well as to the spatial pattern of domains and to their dynamics. We studied the phase separation effect around the metal-to-insulator transition in doped titanates with soft x-ray photons from BESSY II and high energy x-rays from the ESRF and the ultra brilliant x-ray storage ring PETRA III. Supported by the DFG through SFB 608 and the BMBF through contract 05K10PK2.