Abstract
We investigate the chemical substitution of group 5 into BaFe2As2 ("122") iron arsenide, in the effort to understand why Fe-site hole doping of this compound (e.g., using group 5 or 6) does not yield bulk superconductivity. We find an increase in the c-lattice parameter of the BaFe2As2 with the substitution of V, Nb, or Ta; the reduction in c predicts the lack of bulk superconductivity [Konzen and Sefat, J. Phys.: Condens. Matter 29, 083001 (2017)10.1088/1361-648X/aa4e03] that is confirmed here through transport and magnetization results. However, our spectroscopy measurements find a coexistence of antiferromagnetic and local superconducting nanoscale regions in V-122, observed in a transition-metal hole-doped iron arsenide. In BaFe2As2, there is a complex connection between local parameters such as composition and lattice strain, average lattice details, and the emergence of bulk quantum states such as superconductivity and magnetism.
| Original language | English |
|---|---|
| Article number | 104525 |
| Journal | Physical Review B |
| Volume | 100 |
| Issue number | 10 |
| DOIs | |
| State | Published - Sep 26 2019 |
Funding
The research is supported by the US Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES), Materials Sciences and Engineering (MSE) Division. The use of STM study was supported through user projects conducted at the Center for Nanophase Materials Sciences (CNMS). This research also used neutron resources at the High Flux Isotope Reactor (HFIR). The CNMS and HFIR are DOE Office of Science User Facilities operated by the Oak Ridge National Laboratory. The research is supported by the US Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES), Materials Sciences and Engineering (MSE) Division. The use of STM study was supported through user projects conducted at the Center for Nanophase Materials Sciences (CNMS). This research also used neutron resources at the High Flux Isotope Reactor (HFIR). The CNMS and HFIR are DOE Office of Science User Facilities operated by the Oak Ridge National Laboratory.