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Strong antiferromagnetic proximity coupling in the heterostructure superconductor Sr2VO3-delta FeAs
- Title
- Strong antiferromagnetic proximity coupling in the heterostructure superconductor Sr2VO3-delta FeAs
- Authors
- Ok, Jong Mok; Kwon, Chang Il.; Valenzuela, O. E. Ayala; Kim, Sunghun; McDonald, Ross D.; Kim, Jeehoon; Choi, E. S.; Kang, Woun; Jo, Y. J.; Kim, C.; Moon, E. G.; Kim, Y. K.; Kim, Jun Sung
- Ewha Authors
- 강원
- SCOPUS Author ID
- 강원
- Issue Date
- 2022
- Journal Title
- PHYSICAL REVIEW B
- ISSN
- 2469-9950
2469-9969
- Citation
- PHYSICAL REVIEW B vol. 105, no. 21
- Publisher
- AMER PHYSICAL SOC
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- Abstract
- We report the observation of strong magnetic proximity coupling in the heterostructure superconductor Sr2VO3-delta FeAs, determined by upper critical field H-c2(T) measurements up to 65 T. Using the resistivity and the radio-frequency measurements for both H parallel to ab and H parallel to c, we found a strong upward curvature of H-c2(c)(T), together with a steep increase in H-c2(ab) (T) near T-c, yielding an anisotropic factor gamma H = H-c2(ab)/H-c2(c) up to similar to 20, much higher than those of other iron-based superconductors. These are attributed to the Jaccarino-Peter effect, rather than to the multiband effect, due to strong exchange interaction between itinerant Fe spins of the FeAs layers and localized V spins of Mott-insulating SrVO3-delta layers. These findings provide evidence for strong antiferromagnetic proximity coupling that is comparable to the intralayer superexchange interaction of the SrVO3-delta layer and sufficient to induce magnetic frustration in Sr2VO3-delta FeAs.
- DOI
- 10.1103/PhysRevB.105.214505
- Appears in Collections:
- 자연과학대학 > 물리학전공 > Journal papers
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