Dresden 2011 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 36: SC: Fe-based Superconductors - 122 - Properties, Electronic Structure, Mechanisms
TT 36.10: Vortrag
Mittwoch, 16. März 2011, 16:30–16:45, HSZ 304
Electronic structure studies of parent Ba(Eu)Fe2As2 and their superconducting derivatives using angle-resolved photoemission spectroscopy (ARPES) — •S. Thirupathaiah1, E.D.L. Rienks1, E. van Heumen2, H.S. Jeevan3, P. Gegenwart3, M.S. Golden2, and J. Fink1,4 — 1HZB, Berlin — 2Uni. Amsterdam, The Netherlands — 3Georg-August- universität-Göttingen, Germany — 4IFW, Dresden
The advent of LaO1−xFxFeAs with Tc=26 K has brought enormous interest to the high-Tc superconductor community. It is most important to study the electronic structure of these new superconductors, i.e., Fermi surfaces and band dispersions near the Fermi level at high symmetry points in order to obtain microscopic understanding of superconductivity. We have studied the electronic structure of Fe based 122 type parent compounds and their superconducting derivatives to reveal the important information on the Fermi surface nesting conditions (between hole pockets at the Brillouin zone center and electron pockets at zone corner) as a function of electron, hole doping, and isovalent substitution of P at As site in Ba(Eu)Fe2As2. Our findings show that electron doping into parent BaFe2As2 destroy the nesting conditions and superconductivity emerges, accompanied by increase in the dimensionality of electronic structure. We observe that charge carrier doping into parent compounds show a rigid-band-like behavior of electronic structure where as isovalent substitution show a non rigid-band-type nature.