Oxygen Adsorption Induced Superconductivity in Ultrathin FeTe Film on SrTiO<sub>3</sub>(001)
The phenomenon of oxygen incorporation-induced superconductivity in iron telluride (Fe<sub>1+y</sub>Te, with antiferromagnetic (AFM) orders) is intriguing and quite different from the case of FeSe. Until now, the microscopic origin of the induced superconductivity and the role of oxygen...
| Main Authors: | , , , , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-08-01
|
| Series: | Materials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1944/14/16/4584 |
| _version_ | 1797523043235397632 |
|---|---|
| author | Wei Ren Hao Ru Kun Peng Huifang Li Shuai Lu Aixi Chen Pengdong Wang Xinwei Fang Zhiyun Li Rong Huang Li Wang Yihua Wang Fangsen Li |
| author_facet | Wei Ren Hao Ru Kun Peng Huifang Li Shuai Lu Aixi Chen Pengdong Wang Xinwei Fang Zhiyun Li Rong Huang Li Wang Yihua Wang Fangsen Li |
| author_sort | Wei Ren |
| collection | DOAJ |
| description | The phenomenon of oxygen incorporation-induced superconductivity in iron telluride (Fe<sub>1+y</sub>Te, with antiferromagnetic (AFM) orders) is intriguing and quite different from the case of FeSe. Until now, the microscopic origin of the induced superconductivity and the role of oxygen are far from clear. Here, by combining in situ scanning tunneling microscopy/spectroscopy (STM/STS) and X-ray photoemission spectroscopy (XPS) on oxygenated FeTe, we found physically adsorbed O<sub>2</sub> molecules crystallized into <i>c</i> (2/3 × 2) structure as an oxygen overlayer at low temperature, which was vital for superconductivity. The O<sub>2</sub> overlayer were not epitaxial on the FeTe lattice, which implied weak O<sub>2</sub> –FeTe interaction but strong molecular interactions. The energy shift observed in the STS and XPS measurements indicated a hole doping effect from the O<sub>2</sub> overlayer to the FeTe layer, leading to a superconducting gap of 4.5 meV opened across the Fermi level. Our direct microscopic probe clarified the role of oxygen on FeTe and emphasized the importance of charge transfer effect to induce superconductivity in iron-chalcogenide thin films. |
| first_indexed | 2024-03-10T08:37:51Z |
| format | Article |
| id | doaj.art-2ea2d9e0c4084359a2a838fba2217d10 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T08:37:51Z |
| publishDate | 2021-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-2ea2d9e0c4084359a2a838fba2217d102023-11-22T08:29:44ZengMDPI AGMaterials1996-19442021-08-011416458410.3390/ma14164584Oxygen Adsorption Induced Superconductivity in Ultrathin FeTe Film on SrTiO<sub>3</sub>(001)Wei Ren0Hao Ru1Kun Peng2Huifang Li3Shuai Lu4Aixi Chen5Pengdong Wang6Xinwei Fang7Zhiyun Li8Rong Huang9Li Wang10Yihua Wang11Fangsen Li12School of Nano-Tech and Nano-Bionics, University of Science and Technology of China, Hefei 230026, ChinaDepartment of Physics and State Key Laboratory of Surface Physics, Fudan University, Shanghai 200438, ChinaVacuum Interconnected Nanotech Workstation (Nano-X), Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences (CAS), Suzhou 215123, ChinaVacuum Interconnected Nanotech Workstation (Nano-X), Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences (CAS), Suzhou 215123, ChinaVacuum Interconnected Nanotech Workstation (Nano-X), Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences (CAS), Suzhou 215123, ChinaVacuum Interconnected Nanotech Workstation (Nano-X), Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences (CAS), Suzhou 215123, ChinaVacuum Interconnected Nanotech Workstation (Nano-X), Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences (CAS), Suzhou 215123, ChinaVacuum Interconnected Nanotech Workstation (Nano-X), Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences (CAS), Suzhou 215123, ChinaVacuum Interconnected Nanotech Workstation (Nano-X), Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences (CAS), Suzhou 215123, ChinaVacuum Interconnected Nanotech Workstation (Nano-X), Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences (CAS), Suzhou 215123, ChinaVacuum Interconnected Nanotech Workstation (Nano-X), Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences (CAS), Suzhou 215123, ChinaDepartment of Physics and State Key Laboratory of Surface Physics, Fudan University, Shanghai 200438, ChinaSchool of Nano-Tech and Nano-Bionics, University of Science and Technology of China, Hefei 230026, ChinaThe phenomenon of oxygen incorporation-induced superconductivity in iron telluride (Fe<sub>1+y</sub>Te, with antiferromagnetic (AFM) orders) is intriguing and quite different from the case of FeSe. Until now, the microscopic origin of the induced superconductivity and the role of oxygen are far from clear. Here, by combining in situ scanning tunneling microscopy/spectroscopy (STM/STS) and X-ray photoemission spectroscopy (XPS) on oxygenated FeTe, we found physically adsorbed O<sub>2</sub> molecules crystallized into <i>c</i> (2/3 × 2) structure as an oxygen overlayer at low temperature, which was vital for superconductivity. The O<sub>2</sub> overlayer were not epitaxial on the FeTe lattice, which implied weak O<sub>2</sub> –FeTe interaction but strong molecular interactions. The energy shift observed in the STS and XPS measurements indicated a hole doping effect from the O<sub>2</sub> overlayer to the FeTe layer, leading to a superconducting gap of 4.5 meV opened across the Fermi level. Our direct microscopic probe clarified the role of oxygen on FeTe and emphasized the importance of charge transfer effect to induce superconductivity in iron-chalcogenide thin films.https://www.mdpi.com/1996-1944/14/16/4584FeTeoxygen incorporationsuperconductivitymicroscopic origin |
| spellingShingle | Wei Ren Hao Ru Kun Peng Huifang Li Shuai Lu Aixi Chen Pengdong Wang Xinwei Fang Zhiyun Li Rong Huang Li Wang Yihua Wang Fangsen Li Oxygen Adsorption Induced Superconductivity in Ultrathin FeTe Film on SrTiO<sub>3</sub>(001) Materials FeTe oxygen incorporation superconductivity microscopic origin |
| title | Oxygen Adsorption Induced Superconductivity in Ultrathin FeTe Film on SrTiO<sub>3</sub>(001) |
| title_full | Oxygen Adsorption Induced Superconductivity in Ultrathin FeTe Film on SrTiO<sub>3</sub>(001) |
| title_fullStr | Oxygen Adsorption Induced Superconductivity in Ultrathin FeTe Film on SrTiO<sub>3</sub>(001) |
| title_full_unstemmed | Oxygen Adsorption Induced Superconductivity in Ultrathin FeTe Film on SrTiO<sub>3</sub>(001) |
| title_short | Oxygen Adsorption Induced Superconductivity in Ultrathin FeTe Film on SrTiO<sub>3</sub>(001) |
| title_sort | oxygen adsorption induced superconductivity in ultrathin fete film on srtio sub 3 sub 001 |
| topic | FeTe oxygen incorporation superconductivity microscopic origin |
| url | https://www.mdpi.com/1996-1944/14/16/4584 |
| work_keys_str_mv | AT weiren oxygenadsorptioninducedsuperconductivityinultrathinfetefilmonsrtiosub3sub001 AT haoru oxygenadsorptioninducedsuperconductivityinultrathinfetefilmonsrtiosub3sub001 AT kunpeng oxygenadsorptioninducedsuperconductivityinultrathinfetefilmonsrtiosub3sub001 AT huifangli oxygenadsorptioninducedsuperconductivityinultrathinfetefilmonsrtiosub3sub001 AT shuailu oxygenadsorptioninducedsuperconductivityinultrathinfetefilmonsrtiosub3sub001 AT aixichen oxygenadsorptioninducedsuperconductivityinultrathinfetefilmonsrtiosub3sub001 AT pengdongwang oxygenadsorptioninducedsuperconductivityinultrathinfetefilmonsrtiosub3sub001 AT xinweifang oxygenadsorptioninducedsuperconductivityinultrathinfetefilmonsrtiosub3sub001 AT zhiyunli oxygenadsorptioninducedsuperconductivityinultrathinfetefilmonsrtiosub3sub001 AT ronghuang oxygenadsorptioninducedsuperconductivityinultrathinfetefilmonsrtiosub3sub001 AT liwang oxygenadsorptioninducedsuperconductivityinultrathinfetefilmonsrtiosub3sub001 AT yihuawang oxygenadsorptioninducedsuperconductivityinultrathinfetefilmonsrtiosub3sub001 AT fangsenli oxygenadsorptioninducedsuperconductivityinultrathinfetefilmonsrtiosub3sub001 |