TY - JOUR
T1 - Nanoscale surface element identification and dopant homogeneity in the high-Tc superconductor PrxCa1-xFe 2As2
AU - Zeljkovic, Ilija
AU - Huang, Dennis
AU - Song, Can Li
AU - Lv, Bing
AU - Chu, Ching Wu
AU - Hoffman, Jennifer E.
PY - 2013/5/17
Y1 - 2013/5/17
N2 - We use scanning tunneling microscopy to determine the surface structure and dopant distribution in PrxCa1-xFe2As 2, the highest-Tc member of the 122 family of iron-based superconductors. We identify the cleaved surface termination by mapping the local tunneling barrier height, related to the work function. We image the individual Pr dopants responsible for superconductivity, and show that they do not cluster, but in fact repel each other at short length scales. We therefore suggest that the low volume fraction high-Tc superconducting phase is unlikely to originate from Pr inhomogeneity.
AB - We use scanning tunneling microscopy to determine the surface structure and dopant distribution in PrxCa1-xFe2As 2, the highest-Tc member of the 122 family of iron-based superconductors. We identify the cleaved surface termination by mapping the local tunneling barrier height, related to the work function. We image the individual Pr dopants responsible for superconductivity, and show that they do not cluster, but in fact repel each other at short length scales. We therefore suggest that the low volume fraction high-Tc superconducting phase is unlikely to originate from Pr inhomogeneity.
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U2 - 10.1103/PhysRevB.87.201108
DO - 10.1103/PhysRevB.87.201108
M3 - Article
AN - SCOPUS:84877878873
SN - 1098-0121
VL - 87
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 20
M1 - 201108
ER -