Dresden 2011 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 44: Poster Session Correlated Electrons
TT 44.45: Poster
Donnerstag, 17. März 2011, 10:00–13:00, P1
On the coupling of spin and charge order in the stripe phase of layered nickelates — •Pascal Vogt1, Christoph Trabant1,2, Marcel Buchholz1, Chun-Fu Chang1, Niko Pontius2, Marita Döhler1, Enrico Schierle2, Justina Schlappa1,2, Agung Nugroho3, Mohamed Benomar1, Alexander Komarek1, Ralf Feyerherm2, Liu Hao Tjeng1,4, Markus Braden1, and Christian Schüßler-Langeheine1,2 — 1II. Physikalisches Institut, Universität zu Köln, Germany — 2Helmholtz-Zentrum Berlin, Germany — 3Instiut Teknologi Bandung, Indonesia — 4MPI for Chemical Physics of Solids, Dresden, Germany
Stripe order is a complex pattern of spins and charge in the CuO2-planes of doped layered cuprates and NiO2 planes of the isostructural nickelates. Neutron diffraction finds that spin order decays at about 40 K lower temperatures than charge order, while stripe-like magnetic correlations can be found up to higher temperatures. In resonant soft x-ray diffraction this difference between the two orders is less pronounced, but an intriguing loss of spatial coherence at low temperatures is found for both orders, which is not seen by neutron diffraction. In order to understand the interplay between spin and charge order better, we carried out a comparative study of the temperature dependence of both signals as well of their non-equilibrium behaviour upon pumping with a ps-IR-laser pulse. Preliminary results show that both degrees of freedom behave in a similar way. Supported by the DFG through SFB 608, by the BMBF through projects 05 S3XBA/5 and 05 KS7PK1, and by the HZB.