Strong antiferromagnetic proximity coupling in the heterostructure superconductor Sr2VO3−δFeAs
Source abstract
Abstract
We report the observation of strong magnetic proximity coupling in the heterostructure superconductor ${\mathrm{Sr}}2{\mathrm{VO}}_{3\ensuremath{-}\ensuremath{\delta}}\mathrm{FeAs}$, determined by upper critical field ${H}c2(T)$ measurements up to 65 T. Using the resistivity and the radio-frequency measurements for both $H\ensuremath{\parallel}ab$ and $H\ensuremath{\parallel}c$, we found a strong upward curvature of ${H}c2c(T)$, together with a steep increase in ${H}c2ab(T)$ near ${T}c$, yielding an anisotropic factor ${\ensuremath{\gamma}}H={H}c2ab/{H}c2c$ up to $\ensuremath{\sim}20$, 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 ${\mathrm{SrVO}}_{3\ensuremath{-}\ensuremath{\delta}}$ layers. These findings provide evidence for strong antiferromagnetic proximity coupling that is comparable to the intralayer superexchange interaction of the ${\mathrm{SrVO}}_{3\ensuremath{-}\ensuremath{\delta}}$ layer and sufficient to induce magnetic frustration in ${\mathrm{Sr}}2{\mathrm{VO}}_{3\ensuremath{-}\ensuremath{\delta}}\mathrm{FeAs}$.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Iron-based superconductors research · Magnetic and transport properties of perovskites and related materials · Advanced Condensed Matter Physics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science, Pohang 37673, Korea
Department of Physics, Pohang University of Science and Technology, Pohang 37673, Korea
Department of Physics, Pusan National University, Busan 46241, Korea
National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea
National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA
Department of Physics, Ewha Womans University, Seoul 120-750, Korea
Department of Physics, Kyungpook National University, Daegu 41566, Korea
Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
Center for Correlated Electron Systems, Institute for Basic Science, Seoul 08826, Korea
Funding
Institute for Basic Science · National Research Foundation of Korea · Korea Basic Science Institute · Ministry of Education · National Science Foundation
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