Evidence of electronic polarization of the As ion in the superconducting phase of F-doped LaFeAsO
Understanding the nature of superconductivity in iron-based compounds is essential in the development of new strategies to increase Tc. Using a charge density analysis based on synchrotron radiation X-ray powder diffraction data, we found that the charge carriers only accumulated in the iron layer o...
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| Format: | Article |
| Language: | English |
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International Union of Crystallography
2014-05-01
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| Series: | IUCrJ |
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| Online Access: | http://scripts.iucr.org/cgi-bin/paper?S2052252514005636 |
| _version_ | 1798031552492339200 |
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| author | Jungeun Kim Akihiko Fujiwara Tomohiro Sawada Younghun Kim Kunihisa Sugimoto Kenichi Kato Hiroshi Tanaka Motoyuki Ishikado Shin-ichi Shamoto Masaki Takata |
| author_facet | Jungeun Kim Akihiko Fujiwara Tomohiro Sawada Younghun Kim Kunihisa Sugimoto Kenichi Kato Hiroshi Tanaka Motoyuki Ishikado Shin-ichi Shamoto Masaki Takata |
| author_sort | Jungeun Kim |
| collection | DOAJ |
| description | Understanding the nature of superconductivity in iron-based compounds is essential in the development of new strategies to increase Tc. Using a charge density analysis based on synchrotron radiation X-ray powder diffraction data, we found that the charge carriers only accumulated in the iron layer of the superconducting phase of LaFeAsO1 − xFx at low temperatures. Analysis of the electrostatic potential distribution revealed the concerted enhancement of the electronic polarization of the As ions and the carrier redistribution. This suggests that the enhanced electronic polarization of the As ion plays an important role in inducing high Tc superconductivity, and that the polaron concept, which has been previously regarded as an untenable mechanism, should be reconsidered for the description of the iron–arsenide superconducting phase. |
| first_indexed | 2024-04-11T19:59:11Z |
| format | Article |
| id | doaj.art-8e112763aa2c4f0daeb1f027bc5c3338 |
| institution | Directory Open Access Journal |
| issn | 2052-2525 |
| language | English |
| last_indexed | 2024-04-11T19:59:11Z |
| publishDate | 2014-05-01 |
| publisher | International Union of Crystallography |
| record_format | Article |
| series | IUCrJ |
| spelling | doaj.art-8e112763aa2c4f0daeb1f027bc5c33382022-12-22T04:05:46ZengInternational Union of CrystallographyIUCrJ2052-25252014-05-011315515910.1107/S2052252514005636yc5002Evidence of electronic polarization of the As ion in the superconducting phase of F-doped LaFeAsOJungeun Kim0Akihiko Fujiwara1Tomohiro Sawada2Younghun Kim3Kunihisa Sugimoto4Kenichi Kato5Hiroshi Tanaka6Motoyuki Ishikado7Shin-ichi Shamoto8Masaki Takata9Japan Synchrotron Radiation Research Institute, Kouto, Sayo-cho, Hyogo 679-5198, JapanJapan Synchrotron Radiation Research Institute, Kouto, Sayo-cho, Hyogo 679-5198, JapanDepartment of Advanced Materials Science, The University of Tokyo, Kashiwa, Chiba 277-8561, JapanDepartment of Advanced Materials Science, The University of Tokyo, Kashiwa, Chiba 277-8561, JapanJapan Synchrotron Radiation Research Institute, Kouto, Sayo-cho, Hyogo 679-5198, JapanJapan Synchrotron Radiation Research Institute, Kouto, Sayo-cho, Hyogo 679-5198, JapanDepartment of Materials Science, Shimane University, 1060 Nishi-kawatsu-cho, Matsue, Shimane 690-8504, JapanComprehensive Research Organization for Science and Society (CROSS), Ibaraki 319-1106, JapanJapan Atomic Energy Agency, Ibaraki 319-1195, JapanJapan Synchrotron Radiation Research Institute, Kouto, Sayo-cho, Hyogo 679-5198, JapanUnderstanding the nature of superconductivity in iron-based compounds is essential in the development of new strategies to increase Tc. Using a charge density analysis based on synchrotron radiation X-ray powder diffraction data, we found that the charge carriers only accumulated in the iron layer of the superconducting phase of LaFeAsO1 − xFx at low temperatures. Analysis of the electrostatic potential distribution revealed the concerted enhancement of the electronic polarization of the As ions and the carrier redistribution. This suggests that the enhanced electronic polarization of the As ion plays an important role in inducing high Tc superconductivity, and that the polaron concept, which has been previously regarded as an untenable mechanism, should be reconsidered for the description of the iron–arsenide superconducting phase.http://scripts.iucr.org/cgi-bin/paper?S2052252514005636superconductivityelectronic polarizationcharge-carrier redistribution |
| spellingShingle | Jungeun Kim Akihiko Fujiwara Tomohiro Sawada Younghun Kim Kunihisa Sugimoto Kenichi Kato Hiroshi Tanaka Motoyuki Ishikado Shin-ichi Shamoto Masaki Takata Evidence of electronic polarization of the As ion in the superconducting phase of F-doped LaFeAsO IUCrJ superconductivity electronic polarization charge-carrier redistribution |
| title | Evidence of electronic polarization of the As ion in the superconducting phase of F-doped LaFeAsO |
| title_full | Evidence of electronic polarization of the As ion in the superconducting phase of F-doped LaFeAsO |
| title_fullStr | Evidence of electronic polarization of the As ion in the superconducting phase of F-doped LaFeAsO |
| title_full_unstemmed | Evidence of electronic polarization of the As ion in the superconducting phase of F-doped LaFeAsO |
| title_short | Evidence of electronic polarization of the As ion in the superconducting phase of F-doped LaFeAsO |
| title_sort | evidence of electronic polarization of the as ion in the superconducting phase of f doped lafeaso |
| topic | superconductivity electronic polarization charge-carrier redistribution |
| url | http://scripts.iucr.org/cgi-bin/paper?S2052252514005636 |
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