Strong antiferromagnetic proximity coupling in the heterostructure superconductor Sr2VO3-δFeAs

Jong Mok Ok; Chang Il Kwon; O. E.Ayala Valenzuela; Sunghun Kim; Ross D. McDonald; Jeehoon Kim; E. S. Choi; Woun Kang; Y. J. Jo; C. Kim; E. G. Moon; Y. K. Kim; Jun Sung Kim

doi:10.1103/PhysRevB.105.214505

Strong antiferromagnetic proximity coupling in the heterostructure superconductor Sr2VO3-δFeAs

Jong Mok Ok, Chang Il Kwon, O. E.Ayala Valenzuela, Sunghun Kim, Ross D. McDonald, Jeehoon Kim, E. S. Choi, Woun Kang, Y. J. Jo, C. Kim, E. G. Moon, Y. K. Kim, Jun Sung Kim

Department of Physics

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4 Scopus citations

Abstract

We report the observation of strong magnetic proximity coupling in the heterostructure superconductor Sr2VO3-δFeAs, determined by upper critical field 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 in Hc2ab(T) near Tc, yielding an anisotropic factor γH=Hc2ab/Hc2c up 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-δ layers. These findings provide evidence for strong antiferromagnetic proximity coupling that is comparable to the intralayer superexchange interaction of the SrVO3-δ layer and sufficient to induce magnetic frustration in Sr2VO3-δFeAs.

Original language	English
Article number	214505
Journal	Physical Review B
Volume	105
Issue number	21
DOIs	https://doi.org/10.1103/PhysRevB.105.214505
State	Published - 1 Jun 2022

Bibliographical note

Funding Information:
The authors thank Y. K. Bang for fruitful discussions. We also thank H. G. Kim at Pohang Accelerator Laboratory (PAL) for the technical support. This work was supported by the Institute for Basic Science (IBS) through the Center for Artificial Low Dimensional Electronic Systems (Gran No. IBS-R014-D1) and by the National Research Foundation of Korea (NRF) through SRC (Grant No. 2018R1A5A6075964) and the Max Planck-POSTECH Center for Complex Phase Materials (Grant No. 2016K1A4A4A01922028). W.K. acknowledges the support from NRF (Grants No. 2018R1D1A1B07050087 and 2018R1A6A1A03025340), and Y.J.J. was supported by NRF (Grant No. NRF-2019R1A2C1089017). J.M.O. acknowledges support from the Korea Basic Science Institute (National research Facilities and Equipment Center) grant funded by the Ministry of Education (Grant No. 2021R1A6C101A429) and the National Research Foundation of Korea (NRF) (Grant No. 2021R1F1A1056934). C.K. acknowledges support from IBS-CCES (Grant No. IBS-R009-G2). E.G.M. acknowledges the support from NRF (Grants No. NRF-2019M3E4A1080411, No. NRF-2020R1A4A3079707, and No. NRF-2021R1A2C4001847). A portion of this work was performed at the National High Magnetic Field Laboratory, which is supported by National Science Foundation Cooperative Agreement No. DMR-1644779 and the state of Florida.

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© 2022 American Physical Society.

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10.1103/PhysRevB.105.214505

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@article{1f0e65ec69ff486eb02f8ccf1ea3c9a6,

title = "Strong antiferromagnetic proximity coupling in the heterostructure superconductor Sr2VO3-δFeAs",

abstract = "We report the observation of strong magnetic proximity coupling in the heterostructure superconductor Sr2VO3-δFeAs, determined by upper critical field 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 in Hc2ab(T) near Tc, yielding an anisotropic factor γH=Hc2ab/Hc2c up 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-δ layers. These findings provide evidence for strong antiferromagnetic proximity coupling that is comparable to the intralayer superexchange interaction of the SrVO3-δ layer and sufficient to induce magnetic frustration in Sr2VO3-δFeAs.",

author = "Ok, {Jong Mok} and Kwon, {Chang Il} and Valenzuela, {O. E.Ayala} and Sunghun Kim and McDonald, {Ross D.} and Jeehoon Kim and Choi, {E. S.} and Woun Kang and Jo, {Y. J.} and C. Kim and Moon, {E. G.} and Kim, {Y. K.} and Kim, {Jun Sung}",

note = "Funding Information: The authors thank Y. K. Bang for fruitful discussions. We also thank H. G. Kim at Pohang Accelerator Laboratory (PAL) for the technical support. This work was supported by the Institute for Basic Science (IBS) through the Center for Artificial Low Dimensional Electronic Systems (Gran No. IBS-R014-D1) and by the National Research Foundation of Korea (NRF) through SRC (Grant No. 2018R1A5A6075964) and the Max Planck-POSTECH Center for Complex Phase Materials (Grant No. 2016K1A4A4A01922028). W.K. acknowledges the support from NRF (Grants No. 2018R1D1A1B07050087 and 2018R1A6A1A03025340), and Y.J.J. was supported by NRF (Grant No. NRF-2019R1A2C1089017). J.M.O. acknowledges support from the Korea Basic Science Institute (National research Facilities and Equipment Center) grant funded by the Ministry of Education (Grant No. 2021R1A6C101A429) and the National Research Foundation of Korea (NRF) (Grant No. 2021R1F1A1056934). C.K. acknowledges support from IBS-CCES (Grant No. IBS-R009-G2). E.G.M. acknowledges the support from NRF (Grants No. NRF-2019M3E4A1080411, No. NRF-2020R1A4A3079707, and No. NRF-2021R1A2C4001847). A portion of this work was performed at the National High Magnetic Field Laboratory, which is supported by National Science Foundation Cooperative Agreement No. DMR-1644779 and the state of Florida. Publisher Copyright: {\textcopyright} 2022 American Physical Society.",

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doi = "10.1103/PhysRevB.105.214505",

language = "English",

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T1 - Strong antiferromagnetic proximity coupling in the heterostructure superconductor Sr2VO3-δFeAs

AU - Ok, Jong Mok

AU - Kwon, Chang Il

AU - Valenzuela, O. E.Ayala

AU - Kim, Sunghun

AU - McDonald, Ross D.

AU - Kim, Jeehoon

AU - Choi, E. S.

AU - Kang, Woun

AU - Jo, Y. J.

AU - Kim, C.

AU - Moon, E. G.

AU - Kim, Y. K.

AU - Kim, Jun Sung

N1 - Funding Information: The authors thank Y. K. Bang for fruitful discussions. We also thank H. G. Kim at Pohang Accelerator Laboratory (PAL) for the technical support. This work was supported by the Institute for Basic Science (IBS) through the Center for Artificial Low Dimensional Electronic Systems (Gran No. IBS-R014-D1) and by the National Research Foundation of Korea (NRF) through SRC (Grant No. 2018R1A5A6075964) and the Max Planck-POSTECH Center for Complex Phase Materials (Grant No. 2016K1A4A4A01922028). W.K. acknowledges the support from NRF (Grants No. 2018R1D1A1B07050087 and 2018R1A6A1A03025340), and Y.J.J. was supported by NRF (Grant No. NRF-2019R1A2C1089017). J.M.O. acknowledges support from the Korea Basic Science Institute (National research Facilities and Equipment Center) grant funded by the Ministry of Education (Grant No. 2021R1A6C101A429) and the National Research Foundation of Korea (NRF) (Grant No. 2021R1F1A1056934). C.K. acknowledges support from IBS-CCES (Grant No. IBS-R009-G2). E.G.M. acknowledges the support from NRF (Grants No. NRF-2019M3E4A1080411, No. NRF-2020R1A4A3079707, and No. NRF-2021R1A2C4001847). A portion of this work was performed at the National High Magnetic Field Laboratory, which is supported by National Science Foundation Cooperative Agreement No. DMR-1644779 and the state of Florida. Publisher Copyright: © 2022 American Physical Society.

PY - 2022/6/1

Y1 - 2022/6/1

N2 - We report the observation of strong magnetic proximity coupling in the heterostructure superconductor Sr2VO3-δFeAs, determined by upper critical field 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 in Hc2ab(T) near Tc, yielding an anisotropic factor γH=Hc2ab/Hc2c up 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-δ layers. These findings provide evidence for strong antiferromagnetic proximity coupling that is comparable to the intralayer superexchange interaction of the SrVO3-δ layer and sufficient to induce magnetic frustration in Sr2VO3-δFeAs.

AB - We report the observation of strong magnetic proximity coupling in the heterostructure superconductor Sr2VO3-δFeAs, determined by upper critical field 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 in Hc2ab(T) near Tc, yielding an anisotropic factor γH=Hc2ab/Hc2c up 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-δ layers. These findings provide evidence for strong antiferromagnetic proximity coupling that is comparable to the intralayer superexchange interaction of the SrVO3-δ layer and sufficient to induce magnetic frustration in Sr2VO3-δFeAs.

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U2 - 10.1103/PhysRevB.105.214505

DO - 10.1103/PhysRevB.105.214505

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VL - 105

JO - Physical Review B

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ER -

Strong antiferromagnetic proximity coupling in the heterostructure superconductor Sr2VO3-δFeAs

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