Anomalous electron doping independent two-dimensional superconductivity
Transition metal (Co and Ni) co-doping effects are investigated on an underdoped Ca _0.94 La _0.06 Fe _2 As _2 compound. It is discovered that electron doping from substituting Fe with transition metal (TM = Co, Ni) can trigger high- ${T}_{{\rm{c}}}$ superconductivity around 35 K, which emerges abru...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2017-01-01
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| Series: | New Journal of Physics |
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| Online Access: | https://doi.org/10.1088/1367-2630/aa73a0 |
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| author | Wei Zhou Xiangzhuo Xing Haijun Zhao Jiajia Feng Yongqiang Pan Nan Zhou Yufeng Zhang Bin Qian Zhixiang Shi |
| author_facet | Wei Zhou Xiangzhuo Xing Haijun Zhao Jiajia Feng Yongqiang Pan Nan Zhou Yufeng Zhang Bin Qian Zhixiang Shi |
| author_sort | Wei Zhou |
| collection | DOAJ |
| description | Transition metal (Co and Ni) co-doping effects are investigated on an underdoped Ca _0.94 La _0.06 Fe _2 As _2 compound. It is discovered that electron doping from substituting Fe with transition metal (TM = Co, Ni) can trigger high- ${T}_{{\rm{c}}}$ superconductivity around 35 K, which emerges abruptly before the total suppression of the innate spin-density-wave/anti-ferromagnetism (SDW/AFM) state. Remarkably, the critical temperature for the high- ${T}_{{\rm{c}}}$ superconductivity remains constant against a wide range of TM doping levels. And the net electron doping density dependence of the superconducting ${T}_{{\rm{c}}}$ based on the rigid band model can be nicely scaled into a single curve for Co and Ni substitutions, in stark contrast to the case of Ba(Fe _1− _x TM _x ) _2 As _2 . This carrier density independent superconductivity and the unusual scaling behavior are presumably resulted from the interface superconductivity based on the similarity with the interface superconductivity in a La _2− _x Sr _x CuO _4 -La _2 CuO _4 bilayer. Evidence of the two-dimensional character of the superfluid by angle-resolved magneto-resistance measurements can further strengthen the interface nature of the high- ${T}_{{\rm{c}}}$ superconductivity. |
| first_indexed | 2024-03-12T16:35:26Z |
| format | Article |
| id | doaj.art-541f8cb87f224c35ae3b1c8d5f78463f |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:35:26Z |
| publishDate | 2017-01-01 |
| publisher | IOP Publishing |
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| series | New Journal of Physics |
| spelling | doaj.art-541f8cb87f224c35ae3b1c8d5f78463f2023-08-08T14:53:51ZengIOP PublishingNew Journal of Physics1367-26302017-01-0119707301410.1088/1367-2630/aa73a0Anomalous electron doping independent two-dimensional superconductivityWei Zhou0Xiangzhuo Xing1Haijun Zhao2Jiajia Feng3Yongqiang Pan4Nan Zhou5Yufeng Zhang6Bin Qian7Zhixiang Shi8School of Physics and Key Laboratory of MEMS of the Ministry of Education, Southeast University , Nanjing 211189, People’s Republic of China; Advanced Functional Materials Lab and Department of Physics, Changshu Institute of Technology , Changshu 215500, People’s Republic of ChinaSchool of Physics and Key Laboratory of MEMS of the Ministry of Education, Southeast University , Nanjing 211189, People’s Republic of ChinaSchool of Physics and Key Laboratory of MEMS of the Ministry of Education, Southeast University , Nanjing 211189, People’s Republic of ChinaSchool of Physics and Key Laboratory of MEMS of the Ministry of Education, Southeast University , Nanjing 211189, People’s Republic of ChinaSchool of Physics and Key Laboratory of MEMS of the Ministry of Education, Southeast University , Nanjing 211189, People’s Republic of ChinaSchool of Physics and Key Laboratory of MEMS of the Ministry of Education, Southeast University , Nanjing 211189, People’s Republic of ChinaSchool of Physics and Key Laboratory of MEMS of the Ministry of Education, Southeast University , Nanjing 211189, People’s Republic of ChinaAdvanced Functional Materials Lab and Department of Physics, Changshu Institute of Technology , Changshu 215500, People’s Republic of ChinaSchool of Physics and Key Laboratory of MEMS of the Ministry of Education, Southeast University , Nanjing 211189, People’s Republic of ChinaTransition metal (Co and Ni) co-doping effects are investigated on an underdoped Ca _0.94 La _0.06 Fe _2 As _2 compound. It is discovered that electron doping from substituting Fe with transition metal (TM = Co, Ni) can trigger high- ${T}_{{\rm{c}}}$ superconductivity around 35 K, which emerges abruptly before the total suppression of the innate spin-density-wave/anti-ferromagnetism (SDW/AFM) state. Remarkably, the critical temperature for the high- ${T}_{{\rm{c}}}$ superconductivity remains constant against a wide range of TM doping levels. And the net electron doping density dependence of the superconducting ${T}_{{\rm{c}}}$ based on the rigid band model can be nicely scaled into a single curve for Co and Ni substitutions, in stark contrast to the case of Ba(Fe _1− _x TM _x ) _2 As _2 . This carrier density independent superconductivity and the unusual scaling behavior are presumably resulted from the interface superconductivity based on the similarity with the interface superconductivity in a La _2− _x Sr _x CuO _4 -La _2 CuO _4 bilayer. Evidence of the two-dimensional character of the superfluid by angle-resolved magneto-resistance measurements can further strengthen the interface nature of the high- ${T}_{{\rm{c}}}$ superconductivity.https://doi.org/10.1088/1367-2630/aa73a0interface superconductivityiron pnictidephase diagramtwo-dimensional superconductivity74.70.Xa74.78.-w |
| spellingShingle | Wei Zhou Xiangzhuo Xing Haijun Zhao Jiajia Feng Yongqiang Pan Nan Zhou Yufeng Zhang Bin Qian Zhixiang Shi Anomalous electron doping independent two-dimensional superconductivity New Journal of Physics interface superconductivity iron pnictide phase diagram two-dimensional superconductivity 74.70.Xa 74.78.-w |
| title | Anomalous electron doping independent two-dimensional superconductivity |
| title_full | Anomalous electron doping independent two-dimensional superconductivity |
| title_fullStr | Anomalous electron doping independent two-dimensional superconductivity |
| title_full_unstemmed | Anomalous electron doping independent two-dimensional superconductivity |
| title_short | Anomalous electron doping independent two-dimensional superconductivity |
| title_sort | anomalous electron doping independent two dimensional superconductivity |
| topic | interface superconductivity iron pnictide phase diagram two-dimensional superconductivity 74.70.Xa 74.78.-w |
| url | https://doi.org/10.1088/1367-2630/aa73a0 |
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