Abstract
We present a systematic study of resistivity and thermoelectric power for iron pnictide systems KxSr1−xFe2As2 and KxBa1−xFe2As2 for 0<x<1. Both systems show a similar phase diagram with an antiferromagnetic (AFM) phase on the low-doping side and a superconducting dome-shaped phase at higher doping. The AFM phase intersects the superconducting phase boundary. The extrapolation of the AFM phase boundary to zero temperature defines a critical doping of xc∼0.4. We show that the electrical and thermoelectric transport properties above the superconducting Tc obey a characteristic temperature scaling behavior at xc. The crossover and scaling property indicates the existence of a (possibly hidden) magnetic quantum critical point in the phase diagram of the 122 iron pnictides. The results of this investigation prove the significance of magnetic fluctuations in iron pnictide superconductors.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.