Superconducting properties of (NH3)yLixFeSe0.5Te0.5 under pressure
We prepared two superconducting phases of (NH _3 ) _y Li _x FeSe _0.5 Te _0.5 , which show superconducting transition temperatures ( T _c ’s) as high as 20.2 and 29.5 K at ambient pressure, here called the ‘low- T _c phase’ and ‘high- T _c phase’. The temperature dependence of electrical resistance...
| Main Authors: | , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2019-01-01
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| Series: | New Journal of Physics |
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| Online Access: | https://doi.org/10.1088/1367-2630/ab5034 |
| _version_ | 1797750433927659520 |
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| author | Xiaofan Yang Tong He Tomoya Taguchi Huan Li Yanan Wang Hidenori Goto Ritsuko Eguchi Takafumi Miyazaki Hitoshi Yamaoka Hirofumi Ishii Yen-Fa Liao Yoshihiro Kubozono |
| author_facet | Xiaofan Yang Tong He Tomoya Taguchi Huan Li Yanan Wang Hidenori Goto Ritsuko Eguchi Takafumi Miyazaki Hitoshi Yamaoka Hirofumi Ishii Yen-Fa Liao Yoshihiro Kubozono |
| author_sort | Xiaofan Yang |
| collection | DOAJ |
| description | We prepared two superconducting phases of (NH _3 ) _y Li _x FeSe _0.5 Te _0.5 , which show superconducting transition temperatures ( T _c ’s) as high as 20.2 and 29.5 K at ambient pressure, here called the ‘low- T _c phase’ and ‘high- T _c phase’. The temperature dependence of electrical resistance ( R ) was measured for the low- T _c phase of (NH _3 ) _y Li _x FeSe _0.5 Te _0.5 over a pressure ( p ) range of 0–14 GPa, and for the high- T _c phase of (NH _3 ) _y Li _x FeSe _0.5 Te _0.5 over 0–19 GPa, yielding double-dome superconducting T _c – p phase diagrams, i.e. two superconducting phases (SC-I and SC-II) were found for both the low- T _c and high- T _c phases under pressure. For the low- T _c phase, the maximum T _c was 20.2 K at 0 GPa for SC-I, and 19.9 K at 8.98 GPa for SC-II. For the high- T _c phase, the maximum T _c was 33.0 K at 1.00 GPa for SC-I, and 24.0 K at 11.5–13.2 GPa for SC-II. These results imply that the maximum T _c value of the high pressure phase (SC-II) does not exceed the maximum value of the SC-I, unlike what was shown in the T _c – p phase diagrams of (NH _3 ) _y Li _x FeSe and (NH _3 ) _y Cs _x FeSe investigated previously. Nevertheless, the double-dome T _c – p phase diagram was found in metal-doped FeSe _0.5 Te _0.5 , indicating that this feature is universal in metal-doped FeSe _1− _z Te _z . Moreover, no structural phase transitions were observed for either the low- T _c or high- T _c phases of (NH _3 ) _y Li _x FeSe _0.5 Te _0.5 over the wide pressure range of 0–15.3 GPa, and the T _c -lattice constant ( c ) plots for both phases were recorded to determine the critical point separating SC-I and SC-II. |
| first_indexed | 2024-03-12T16:32:37Z |
| format | Article |
| id | doaj.art-9b4cbe7cc2b549cc9aaf47b4a8de576f |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:32:37Z |
| publishDate | 2019-01-01 |
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| series | New Journal of Physics |
| spelling | doaj.art-9b4cbe7cc2b549cc9aaf47b4a8de576f2023-08-08T15:25:10ZengIOP PublishingNew Journal of Physics1367-26302019-01-01211111301010.1088/1367-2630/ab5034Superconducting properties of (NH3)yLixFeSe0.5Te0.5 under pressureXiaofan Yang0Tong He1Tomoya Taguchi2Huan Li3Yanan Wang4Hidenori Goto5Ritsuko Eguchi6Takafumi Miyazaki7Hitoshi Yamaoka8https://orcid.org/0000-0003-0462-5385Hirofumi Ishii9Yen-Fa Liao10Yoshihiro Kubozono11https://orcid.org/0000-0002-7910-0308Research Institute for Interdisciplinary Science, Okayama University , Okayama 700-8530, JapanResearch Institute for Interdisciplinary Science, Okayama University , Okayama 700-8530, JapanResearch Institute for Interdisciplinary Science, Okayama University , Okayama 700-8530, JapanResearch Institute for Interdisciplinary Science, Okayama University , Okayama 700-8530, JapanResearch Institute for Interdisciplinary Science, Okayama University , Okayama 700-8530, JapanResearch Institute for Interdisciplinary Science, Okayama University , Okayama 700-8530, JapanResearch Institute for Interdisciplinary Science, Okayama University , Okayama 700-8530, JapanResearch Laboratory for Surface Science, Okayama University , Okayama 700-8530, JapanRIKEN SPring-8 Center, Hyogo 679-5148, JapanNational Synchrotron Radiation Research Center, Hsinchu 30076, TaiwanNational Synchrotron Radiation Research Center, Hsinchu 30076, TaiwanResearch Institute for Interdisciplinary Science, Okayama University , Okayama 700-8530, JapanWe prepared two superconducting phases of (NH _3 ) _y Li _x FeSe _0.5 Te _0.5 , which show superconducting transition temperatures ( T _c ’s) as high as 20.2 and 29.5 K at ambient pressure, here called the ‘low- T _c phase’ and ‘high- T _c phase’. The temperature dependence of electrical resistance ( R ) was measured for the low- T _c phase of (NH _3 ) _y Li _x FeSe _0.5 Te _0.5 over a pressure ( p ) range of 0–14 GPa, and for the high- T _c phase of (NH _3 ) _y Li _x FeSe _0.5 Te _0.5 over 0–19 GPa, yielding double-dome superconducting T _c – p phase diagrams, i.e. two superconducting phases (SC-I and SC-II) were found for both the low- T _c and high- T _c phases under pressure. For the low- T _c phase, the maximum T _c was 20.2 K at 0 GPa for SC-I, and 19.9 K at 8.98 GPa for SC-II. For the high- T _c phase, the maximum T _c was 33.0 K at 1.00 GPa for SC-I, and 24.0 K at 11.5–13.2 GPa for SC-II. These results imply that the maximum T _c value of the high pressure phase (SC-II) does not exceed the maximum value of the SC-I, unlike what was shown in the T _c – p phase diagrams of (NH _3 ) _y Li _x FeSe and (NH _3 ) _y Cs _x FeSe investigated previously. Nevertheless, the double-dome T _c – p phase diagram was found in metal-doped FeSe _0.5 Te _0.5 , indicating that this feature is universal in metal-doped FeSe _1− _z Te _z . Moreover, no structural phase transitions were observed for either the low- T _c or high- T _c phases of (NH _3 ) _y Li _x FeSe _0.5 Te _0.5 over the wide pressure range of 0–15.3 GPa, and the T _c -lattice constant ( c ) plots for both phases were recorded to determine the critical point separating SC-I and SC-II.https://doi.org/10.1088/1367-2630/ab5034superconductivitypressurephase diagramcrystal structuremetal intercalated FeSe0.5Te0.5 |
| spellingShingle | Xiaofan Yang Tong He Tomoya Taguchi Huan Li Yanan Wang Hidenori Goto Ritsuko Eguchi Takafumi Miyazaki Hitoshi Yamaoka Hirofumi Ishii Yen-Fa Liao Yoshihiro Kubozono Superconducting properties of (NH3)yLixFeSe0.5Te0.5 under pressure New Journal of Physics superconductivity pressure phase diagram crystal structure metal intercalated FeSe0.5Te0.5 |
| title | Superconducting properties of (NH3)yLixFeSe0.5Te0.5 under pressure |
| title_full | Superconducting properties of (NH3)yLixFeSe0.5Te0.5 under pressure |
| title_fullStr | Superconducting properties of (NH3)yLixFeSe0.5Te0.5 under pressure |
| title_full_unstemmed | Superconducting properties of (NH3)yLixFeSe0.5Te0.5 under pressure |
| title_short | Superconducting properties of (NH3)yLixFeSe0.5Te0.5 under pressure |
| title_sort | superconducting properties of nh3 ylixfese0 5te0 5 under pressure |
| topic | superconductivity pressure phase diagram crystal structure metal intercalated FeSe0.5Te0.5 |
| url | https://doi.org/10.1088/1367-2630/ab5034 |
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