Project Details
Projekt
Electronic, structural, and magnetic properties of single crystalline pnictides: Thermodynamic studies down to ultra-low temperatures
Subject Area
Experimental Condensed Matter Physics
Term
from 2013 to 2019
Project identifier
Deutsche Forschungsgemeinschaft (DFG) - Project number 237770550
We will apply thermodynamic and magnetic studies down to 10 mK in order to investigate the nature of superconductivity and the interplay of magnetism, structure, and electronic properties in Fe-based superconductors. For investigating superconductivity, we will perform measurements of the specific heat at very low temperatures 10 mK – 4 K in magnetic fields up to 9T by means of an existing calorimeter and a newly designed magnetic thermometry-based calorimeter which will be realized. The specific heat studies will be complemented by magnetic susceptibility and heat transport measurements in the same temperature regime. Both in-plane and out-of-plane doped materials will be addressed which are delivered by our SPP partners, i.e. single-crystalline K1- xNaxFe2As2, LiFeAs, K(Fe,M)2As2 and Na(Fe,M)As with M = Rh, Ru, Co,Ni Cr, Mn. In addition, the interplay of electronic, magnetic, and structural degrees of freedom will be studied by thermal expansion experiments at 2 – 300K. Here, in addition to Na(Fe,M)As, LaFeAsO single crystals and polycrystalline doping series RFeAsO1-xFx will be studied, with a particular focus on the tetragonal phase and nematic magnetic short-range order.
DFG Programme
Priority Programmes
