2020/10/05 by Jong Mok Ok, Chang Il Kwon, Ok, Jong Mok +28
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #FOS: Physical sciences #Magnetic and transport properties of perovskites and related materials #Materials Science (cond-mat.mtrl-sci) #Physics of Superconductivity and Magnetism #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con) #cond-mat.mtrl-sci #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.2010.01752
4 figures
arxiv created 2020/10/05 · openalex publication_date 2020/10/05 · arxiv updated 2020/10/06 · openalex created_date 2020/10/08 · openalex updated_date 2026/07/28
We report observation of strong magnetic proximity coupling in a heterostructured superconductor Sr2VO3FeAs, determined by the upper critical fields Hc2(T) measurements up to 65 T. Using the resistivity and the radio-frequency measurements for both H ∥ ab and H ∥ c, we found a strong upward curvature of Hc2c(T), together with a steep increase of Hc2ab(T) near Tc, yielding the anisotropic factor γH=Hc2ab/Hc2c up to ∼ 20, the largest value among 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 layers. These findings provide evidence for strong antiferromagnetic proximity coupling, comparable with the intralayer superexchange interaction of SrVO3 layer and sufficient to induce magnetic frustration in Sr2VO3FeAs.