Nanoscale surface element identification and dopant homogeneity in the high-Tc superconductor PrxCa1−xFe2As2
Ilija Zeljkovic, Dennis Huang, Can-Li Song, Bing Lv, Ching-Wu Chu, Jennifer E. Hoffman
DOI 10.1103/PhysRevB.87.201108 · Physical Review B
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Abstract
We use scanning tunneling microscopy to determine the surface structure and dopant distribution in PrxCa1−xFe2As2, 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| PrxCa1-xFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 43.2 | Pressure not reported | unknown |
| KxBa1-xFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38 | Pressure not reported | unknown |
| Ba(Fe1-xCox)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25 | Pressure not reported | unknown |
| Sm1-xLaxO1-yFyFeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 57 | Pressure not reported | unknown |
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