Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 45: Superconductivity: Fe-based Superconductors - 1111,111, FeSe
TT 45.1: Vortrag
Dienstag, 1. April 2014, 14:00–14:15, HSZ 201
In-plane vs. out-of-plane doping and disorder in CeFeAsO — •Oleksii Vakaliuk1, Giacomo Prando1, Sabine Wurmehl1, Christian Hess1,2, and Bernd Buechner1,2 — 1Leibniz Institute for Solid State and Materials Research Dresden, Helmholtzstr. 20, 01069 Dresden Germany — 2Center for Transport and Devices of Emergent Materials, TU Dresden, 01069 Dresden, Germany
In this contribution we will discuss the effect of the in-plane Fe/Co and the out-of-plane O/F chemical dilutions on the electronic phase diagram of CeFeAsO. Both substitutions lead to a quantitatively identical suppression of the spin density wave (SDW) phase upon doping, regardless of the actual degree of in-plane disorder. We detected two distinct regimes at low-doping levels: a long-range (LRO) followed by a short-range (SRO) ordered magnetic phase, the latter coexisting with superconductivity within a certain range of doping. In contrast, such in-plane disorder dramatically affects superconductivity and, in particular, the optimal-doping value of Tc [1]. Moreover, the magnetic ordering of the Ce ions is preserved throughout the entire phase diagram in CeFe1−xCoxAsO, at variance with what is observed in CeFeAsO1−xFx. Intriguingly, the ordering temperature TNCe as a function of doping exhibits a dome-like shape in correspondence with the actual superconduting dome.
G. Prando, et.al., Phys. Rev. B 87, 174519 (2013)