Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 25: Superconductivity: Cuprate High-Temperature Superconductors 1
TT 25.5: Vortrag
Mittwoch, 25. März 2009, 10:30–10:45, HSZ 304
Static and fluctuating stripe order in 1/8-doped LNSCO and LSCO — •Hsueh-Hung Wu1,2, Marcel Buchholz1, Christoph Trabant1, Franziskus Heigl3, Enrico Schierle4, Matthias Cwik1, Markus Braden1, Liu-Hao Tjeng1, and Christian Schüßler-Langeheine1 — 1II. Physikalisches Institut, Universitaet zu Koeln, Germany — 2NSRRC, Hsinchu, Taiwan — 3ALBA, Barcelona, Spain — 4Helmholtz-Zentrum Berlin
We have studied the stripe order in La1.475Nd0.4Sr0.125CuO4 (LNSCO) and La1.88Sr0.12CuO4 (LSCO) using resonant soft x-ray diffraction (RSXD). In both systems, a pronounced charge order (CO) peak was found at the oxygen K and copper L2,3 edges. While for LNSCO, Nd stabilizes the static CO, no static CO has been found in LSCO [1]. In fact, earlier experiments from the isostructural nickelate system indicates that RSXD is suited to observe not only static, but also fluctuating order. This is particularly interesting for fluctuating CO, which is very difficult to probe with inelastic neutron diffraction. For LNSCO, the CO signal vanishes near the tetragonal to orthorhombic structural transition; in LSCO, the signal vanishes slightly above the critical temperature similar to what has been found for the spin order [2]. The resonance of the CO signal in both samples looks very similar at the O K edge, while some differences at the Cu L2,3 edges are found. The spectroscopic interpretation of these findings will be discussed.
[1] M. Fujita et al., Phys. Rev. Lett. 88, 167008 (2002).
[2] H. Kirmura et al., Phys. Rev. B 59, 6517 (1999).