期刊
PHYSICAL REVIEW B
卷 87, 期 20, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.87.201108
关键词
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资金
- Air Force Office of Scientific Research [FA9550-06-1-0531]
- US National Science Foundation [DMR-0847433]
- NSERC
- Harvard University
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0847433] Funding Source: National Science Foundation
We use scanning tunneling microscopy to determine the surface structure and dopant distribution in PrxCa1-xFe2As2, the highest-T-c 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-T-c superconducting phase is unlikely to originate from Pr inhomogeneity.
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