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TT: Fachverband Tiefe Temperaturen
TT 17: SC: Fe-based Superconductors - 1111
TT 17.5: Talk
Monday, March 14, 2011, 19:15–19:30, HSZ 301
Nanoscale electronic order and ground-state coexistence in iron pnictides — •Guillaume Lang1, Hans-Joachim Grafe1, Dalibor Paar1,2, Franziska Hammerath1, Katarina Manthey1, Alexey Alfonsov1, Ferenc Murányi1, Richard Zahn1, Vladislav Kataev1, Günter Behr1, Jochen Werner1, Saicharan Aswartham1, Sabine Wurmehl1, and Bernd Büchner1 — 1IFW Dresden, Institute for Solid State Research, P.O. Box 270116, D-01171 Dresden, Germany — 2Dept. of Physics, Faculty of Science, Univ. of Zagreb, P.O. Box 331, HR-10002 Zagreb, Croatia
Controversial issues in the iron-based superconductors are the extent to which static magnetism and superconductivity can coexist, and whether intrinsic electronic inhomogeneities can show up as in related transition metal oxides. Using nuclear quadrupole resonance at the arsenic sites, we investigated the local charge distribution in “1111” pnictides [1]. Underdoped samples are shown to present systematically two different local charge environments, irrespective of the ground state. Spin-lattice relaxation measurements show their coexistence at the nanoscale. Together with the quantitative variations of the spectra with doping, they point to an intrinsic local electronic order, which is likely to impact the interplay of static magnetism and superconductivity. The latter will also be briefly discussed from the point of view of high-field ESR measurements revealing short-range spin correlations [2].
G. Lang et al., Phys. Rev. Lett. 104, 097001 (2010)
A. Alfonsov et al., arXiv:1010.5070