| Title: |
Probing microscopic variations of superconductivity on the surface of Ba(Fe_{1−x}Co_{x})_{2}As_{2} single crystals |
| Authors: |
Kim, TH; Jin, R; Walker, LR; Howe, JY; Pan, MH; Wendelken, JF; Thompson, JR; Sefat, AS; McGuire, MA; Sales, BC; M; rus, D; Li, AP |
| Contributors: |
물리학과; 10127399; Kim, TH |
| Publisher Information: |
American Physical Society |
| Publication Year: |
2009 |
| Collection: |
Pohang University of Science and Technology (POSTECH): Open Access System for Information Sharing (OASIS) |
| Subject Terms: |
barium compounds; cobalt compounds; high-temperature superconductors; iron compounds; scanning electron microscopy; scanning tunnelling microscopy; superconducting transition temperature; surface composition; surface conductivity; X-ray chemical analysis |
| Description: |
The spatially resolved electrical transport properties have been studied on the surface of optimally doped superconducting Ba(Fe1-xCox)(2)As-2 single crystal by using a four-probe scanning tunneling microscopy. While some nonuniform contrast appears near the edge of the cleaved crystal, the scanning electron microscopy (SEM) reveals mostly uniform contrast. For the regions that showed uniform SEM contrast, a sharp superconducting transition at T-C=22.1 K has been observed with a transition width Delta T-C=0.2 K. In the nonuniform contrast region, T-C is found to vary between 19.6 and 22.2 K with Delta T-C from 0.3 to 3.2 K. The wavelength dispersive x-ray spectroscopy reveals that Co concentration remains 7.72% in the uniform region, but changes between 7.38% and 7.62% in the nonuniform region. Thus the variations of superconductivity are associated with local compositional change. ; open ; 1 ; 1 ; 5 ; 5 ; scie ; scopus |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| Relation: |
Physical Review B; 80; 21; SCI급, SCOPUS 등재논문; SCI; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter; Materials Science; Physics; https://oasis.postech.ac.kr/handle/2014.oak/12195; 10575; Physical Review B, v.80, no.21; 000273228200093 |
| DOI: |
10.1103/PHYSREVB.80.214518 |
| Availability: |
https://oasis.postech.ac.kr/handle/2014.oak/12195; https://doi.org/10.1103/PHYSREVB.80.214518 |
| Rights: |
BY_NC_ND ; http://creativecommons.org/licenses/by-nc-nd/2.0/kr |
| Accession Number: |
edsbas.3E7D04D6 |
| Database: |
BASE |