High- Tc iron phosphide superconductivity enhanced by reemergent antiferromagnetic spin fluctuations in [Sr4Sc2O6]Fe2(As1−xPx)2 probed by NMR
| العنوان: | High- Tc iron phosphide superconductivity enhanced by reemergent antiferromagnetic spin fluctuations in [Sr4Sc2O6]Fe2(As1−xPx)2 probed by NMR |
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| المؤلفون: | T. Kouchi, Akira Iyo, Kazunari Yamaura, Hidekazu Mukuda, F. Engetsu, T. Shiota, Kohji Nakamura, Mamoru Yogi, Eiji Takayama-Muromachi, Mitsuharu Yashima, R. Horikawa, Yanfeng Guo, Setsuko Tajima, Katsuhiro Suzuki, Shigeki Miyasaka, F. Sakano |
| المصدر: | Physical Review B. 100 |
| بيانات النشر: | American Physical Society (APS), 2019. |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | Superconductivity, High-temperature superconductivity, Materials science, Condensed matter physics, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, law.invention, chemistry.chemical_compound, Iron phosphide, Lattice constant, chemistry, law, Lattice (order), 0103 physical sciences, Antiferromagnetism, 010306 general physics, 0210 nano-technology, Ground state, Pnictogen |
| الوصف: | We report a systematic NMR study on [Sr4Sc2O6]Fe-2(As1-xPx)(2), for which the local lattice parameters of the iron-pnictogen (FePn) layer are similar to those of the series LaFe(As1-x'Px')O, which exhibits two segregated antiferromagnetic (AFM) order phases, AFM1 at x' = 0 - 0.2 and AFM2 at x' = 0.4 - 0.7. Our results reveal that the parent AFM1 phase at x = 0 disappears at x = 0.3 - 0.4, corresponding to a pnictogen height (h(pn)) from the Fe plane of 1.3-1.32 angstrom, which is similar to that of LaFe(As1-x'Px')O and various parent Fe pnictides. By contrast, the AFM2 order reported for LaFe(As0.4P0.6)O does not appear at x similar to 0.8, although the local lattice parameters of the FePn layer and the microscopic electronic states are quite similar. Despite the absence of the static AFM2 order, reemergent dynamical AFM spin fluctuations were observed at approximately x similar to 0.8, which can be attributed to the instability of the AFM2 phase. We suggest this re-enhancement of AFM spin fluctuations plays a significant role in enhancing the T-c to 17 K for x = 0.8 - 1. Finally, we discuss the universality and diversity of the complicated magnetic ground states from a microscopic point of view, including the difference in the origins of the AFM1 and AFM2 phases, and their relations with the high superconducting transitions in Fe pnictides. |
| تدمد: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.100.094509 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::61bb7f628770d0e5ae61cbdb89fad115 https://doi.org/10.1103/physrevb.100.094509 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi...........61bb7f628770d0e5ae61cbdb89fad115 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 24699969 24699950 |
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| DOI: | 10.1103/physrevb.100.094509 |