期刊
PHYSICAL REVIEW B
卷 97, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.97.014505
关键词
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资金
- Spanish Ministry of Economy and Competitiveness [FIS2014-54498-R, MDM-2014-0377, MAT2014-52405-C2-2-R, RYC-2014-16626, RYC-2014-15093]
- Comunidad de Madrid through program Nanofrontmag-CM [S2013/MIT-2850]
- European Research Council PNICTEYES Grant [679080]
- EU Flagship Graphene [696656]
- COST-EU [CA16218]
- Axa Research Fund
- U.S. Department of Energy, Office of Basic Energy Science, Division of Materials Sciences and Engineering
- U.S. Department of Energy [DE-AC02-07CH11358]
- [FP7-PEOPLE-2013-CIG 618321]
We show that biaxial strain induces alternating tetragonal superconducting and orthorhombic nematic domains in Co-substituted CaFe2As2. We use atomic force, magnetic force, and scanning tunneling microscopy to identify the domains and characterize their properties, finding in particular that tetragonal superconducting domains are very elongated, more than several tens of micrometers long and about 30 nm wide; have the same T-c as unstrained samples; and hold vortices in a magnetic field. Thus, biaxial strain produces a phase-separated state, where each phase is equivalent to what is found on either side of the first-order phase transition between antiferromagnetic orthorhombic and superconducting tetragonal phases found in unstrained samples when changing Co concentration. Having such alternating superconducting domains separated by normal conducting domains with sizes of the order of the coherence length opens opportunities to build Josephson junction networks or vortex pinning arrays and suggests that first-order quantum phase transitions lead to nanometric-size phase separation under the influence of strain.
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