Positive magnetoconductance in SrVO3 double quantum wells with a magnetic EuTiO3 barrier
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866908549177671680 |
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| author | Takahara, N. Takahashi, K. S. Tokura, Y. Kawasaki, M. |
| author_facet | Takahara, N. Takahashi, K. S. Tokura, Y. Kawasaki, M. |
| contents | Controlling Mott insulator states has been a long-standing topic in condensed matter physics. Among various controlling parameters, two-dimensional (2D) confinement in epitaxial heterostructures has been demonstrated to convert the correlated metallic nature of SrVO3 into a Mott insulator by reducing the quantum well thickness. Here, we fabricate double quantum well (DQW) structures of SrVO3 with a magnetic barrier of EuTiO3 to tune the hybridization of wave functions by a magnetic field. A significant positive magnetoconductance is observed for DQWs with barriers thinner than 2 nm, while DQWs with thicker barriers do not show such large positive magnetoconductance, instead behaving as a parallel circuit of two single QWs. The observed positive magnetoconductance is accounted in terms of enhanced hybridization of V 3d orbitals across the EuTiO3 barrier under a magnetic field, where the barrier height is reduced by the Zeeman splitting of Ti 3d bands in forced ferromagnetic ordering of localized 4f electrons on Eu2+sites. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_16540 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Positive magnetoconductance in SrVO3 double quantum wells with a magnetic EuTiO3 barrier Takahara, N. Takahashi, K. S. Tokura, Y. Kawasaki, M. Strongly Correlated Electrons Controlling Mott insulator states has been a long-standing topic in condensed matter physics. Among various controlling parameters, two-dimensional (2D) confinement in epitaxial heterostructures has been demonstrated to convert the correlated metallic nature of SrVO3 into a Mott insulator by reducing the quantum well thickness. Here, we fabricate double quantum well (DQW) structures of SrVO3 with a magnetic barrier of EuTiO3 to tune the hybridization of wave functions by a magnetic field. A significant positive magnetoconductance is observed for DQWs with barriers thinner than 2 nm, while DQWs with thicker barriers do not show such large positive magnetoconductance, instead behaving as a parallel circuit of two single QWs. The observed positive magnetoconductance is accounted in terms of enhanced hybridization of V 3d orbitals across the EuTiO3 barrier under a magnetic field, where the barrier height is reduced by the Zeeman splitting of Ti 3d bands in forced ferromagnetic ordering of localized 4f electrons on Eu2+sites. |
| title | Positive magnetoconductance in SrVO3 double quantum wells with a magnetic EuTiO3 barrier |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2509.16540 |