Coexistence of ferromagnetism and superconductivity at KTaO$_3$ heterointerfaces
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arXiv
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| Autori principali: | , , , , , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| _version_ | 1866917691719155712 |
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| author | Ning, Zhongfeng Qian, Jiahui Liu, Yixin Chen, Fan Zhang, Mingzhu Deng, Liwei Yuan, Xinli Ge, Qingqin Jin, Hua Zhang, Guanqun Peng, Wei Qiao, Shan Mu, Gang Chen, Yan Li, Wei |
| author_facet | Ning, Zhongfeng Qian, Jiahui Liu, Yixin Chen, Fan Zhang, Mingzhu Deng, Liwei Yuan, Xinli Ge, Qingqin Jin, Hua Zhang, Guanqun Peng, Wei Qiao, Shan Mu, Gang Chen, Yan Li, Wei |
| contents | The coexistence of superconductivity and ferromagnetism is a long-standing issue in superconductivity due to the antagonistic nature of these two ordered states. Experimentally identifying and characterizing novel heterointerface superconductors that coexist with magnetism presents significant challenges. Here, we report the experimental observation of two-dimensional long-range ferromagnetic order in the KTaO$_3$ heterointerface superconductor, showing the coexistence of superconductivity and ferromagnetism. Remarkably, our direct current superconducting quantum interference device measurements reveal an in-plane magnetization hysteresis loop persisting above room temperature. Moreover, the first-principles calculations and X-ray magnetic circular dichroism measurements provide decisive insights into the origin of the observed robust ferromagnetism, attributing it to oxygen vacancies that localize electrons in nearby Ta 5$d$ states. Our findings not only suggest KTaO$_3$ heterointerfaces as time-reversal symmetry breaking superconductors, but also inject fresh momentum into the exploration of the intricate interplay between superconductivity and magnetism, enhanced by the strong spin-orbit coupling inherent to the heavy Ta in 5$d$ orbitals of KTaO$_3$ heterointerfaces. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2302_01549 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Coexistence of ferromagnetism and superconductivity at KTaO$_3$ heterointerfaces Ning, Zhongfeng Qian, Jiahui Liu, Yixin Chen, Fan Zhang, Mingzhu Deng, Liwei Yuan, Xinli Ge, Qingqin Jin, Hua Zhang, Guanqun Peng, Wei Qiao, Shan Mu, Gang Chen, Yan Li, Wei Superconductivity Strongly Correlated Electrons The coexistence of superconductivity and ferromagnetism is a long-standing issue in superconductivity due to the antagonistic nature of these two ordered states. Experimentally identifying and characterizing novel heterointerface superconductors that coexist with magnetism presents significant challenges. Here, we report the experimental observation of two-dimensional long-range ferromagnetic order in the KTaO$_3$ heterointerface superconductor, showing the coexistence of superconductivity and ferromagnetism. Remarkably, our direct current superconducting quantum interference device measurements reveal an in-plane magnetization hysteresis loop persisting above room temperature. Moreover, the first-principles calculations and X-ray magnetic circular dichroism measurements provide decisive insights into the origin of the observed robust ferromagnetism, attributing it to oxygen vacancies that localize electrons in nearby Ta 5$d$ states. Our findings not only suggest KTaO$_3$ heterointerfaces as time-reversal symmetry breaking superconductors, but also inject fresh momentum into the exploration of the intricate interplay between superconductivity and magnetism, enhanced by the strong spin-orbit coupling inherent to the heavy Ta in 5$d$ orbitals of KTaO$_3$ heterointerfaces. |
| title | Coexistence of ferromagnetism and superconductivity at KTaO$_3$ heterointerfaces |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2302.01549 |