Pressure-induced isostructural phase transition and charge transfer in superconducting FeSe
Abstract
Here, we present extensive investigations of the crystallographic phase diagram and electronic properties of the Fe-based superconductor FeSe under extreme conditions (high pressure (HP) and low temperature (LT)) by synchrotron X-ray diffraction (XRD) and X-ray absorption spectroscopy (XAS). An isostructural phase transition (Tetragonal (T) →high-pressure Tetragonal (T')) is discovered in FeSe at ~2.8 GPa based on the axial ratio c/a with finer pressure step as observed in Fe-As-based superconductor such as EuFe2As2. We also find a pressure-induced T' → MnP-type phase transition at 7.6 GPa in FeSe, which is consistent with the documented pressure-induced high-spin → low-spin transition (~6–7 GPa). These results reveal the pressure-induced structural phase transition sequence in FeSe at room temperature to be T → T' → T'+MnP-type at pressures of 0–10.6 GPa, enriching the crystallographic phase diagram. The HPLT XRD data also indicate that a sluggish structural phase transition (Cmma → Pnma) begins at 7.5 GPa, and these two phases coexist up to 26.5 GPa. The HP X-ray absorption near-edge spectroscopy (XANES) measurement shows that Eo of Se experiences a pressure-induced shift to high energy, evidencing strongly charge transfer between Fe and Se under high pressure. Our results shed lights on the correlation between crystallographic/electronic structuremore »
- Authors:
-
[5];
[3]
- Center for High Pressure Science and Technology Advanced Research, Shanghai (China); ShanghaiTech Univ., Shanghai (China)
- Huazhong Univ. of Science and Technology, Wuhan (China)
- Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
- Harbin Institute of Technology, Harbin (China)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Chinese Academy of Sciences, Shanghai (China)
- ShanghaiTech Univ., Shanghai (China)
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1484745
- Alternate Identifier(s):
- OSTI ID: 1703722
- Grant/Contract Number:
- AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Alloys and Compounds
- Additional Journal Information:
- Journal Volume: 767; Journal Issue: C; Journal ID: ISSN 0925-8388
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Fe-based superconductor; charge transfer; high pressure; isostructural phase transition
Citation Formats
Yu, Zhenhai, Xu, Ming, Yan, Zhipeng, Yan, Hao, Zhao, Jinggeng, Patel, Umeshkumar, Brewe, Dale L., Heald, Steve M., Ma, Jingyuan, Guo, Yanfeng, Yang, Ke, Xiao, Zhili, and Wang, Lin. Pressure-induced isostructural phase transition and charge transfer in superconducting FeSe. United States: N. p., 2018.
Web. doi:10.1016/j.jallcom.2018.07.161.
Yu, Zhenhai, Xu, Ming, Yan, Zhipeng, Yan, Hao, Zhao, Jinggeng, Patel, Umeshkumar, Brewe, Dale L., Heald, Steve M., Ma, Jingyuan, Guo, Yanfeng, Yang, Ke, Xiao, Zhili, & Wang, Lin. Pressure-induced isostructural phase transition and charge transfer in superconducting FeSe. United States. https://doi.org/10.1016/j.jallcom.2018.07.161
Yu, Zhenhai, Xu, Ming, Yan, Zhipeng, Yan, Hao, Zhao, Jinggeng, Patel, Umeshkumar, Brewe, Dale L., Heald, Steve M., Ma, Jingyuan, Guo, Yanfeng, Yang, Ke, Xiao, Zhili, and Wang, Lin. Tue .
"Pressure-induced isostructural phase transition and charge transfer in superconducting FeSe". United States. https://doi.org/10.1016/j.jallcom.2018.07.161. https://www.osti.gov/servlets/purl/1484745.
@article{osti_1484745,
title = {Pressure-induced isostructural phase transition and charge transfer in superconducting FeSe},
author = {Yu, Zhenhai and Xu, Ming and Yan, Zhipeng and Yan, Hao and Zhao, Jinggeng and Patel, Umeshkumar and Brewe, Dale L. and Heald, Steve M. and Ma, Jingyuan and Guo, Yanfeng and Yang, Ke and Xiao, Zhili and Wang, Lin},
abstractNote = {Here, we present extensive investigations of the crystallographic phase diagram and electronic properties of the Fe-based superconductor FeSe under extreme conditions (high pressure (HP) and low temperature (LT)) by synchrotron X-ray diffraction (XRD) and X-ray absorption spectroscopy (XAS). An isostructural phase transition (Tetragonal (T) →high-pressure Tetragonal (T')) is discovered in FeSe at ~2.8 GPa based on the axial ratio c/a with finer pressure step as observed in Fe-As-based superconductor such as EuFe2As2. We also find a pressure-induced T' → MnP-type phase transition at 7.6 GPa in FeSe, which is consistent with the documented pressure-induced high-spin → low-spin transition (~6–7 GPa). These results reveal the pressure-induced structural phase transition sequence in FeSe at room temperature to be T → T' → T'+MnP-type at pressures of 0–10.6 GPa, enriching the crystallographic phase diagram. The HPLT XRD data also indicate that a sluggish structural phase transition (Cmma → Pnma) begins at 7.5 GPa, and these two phases coexist up to 26.5 GPa. The HP X-ray absorption near-edge spectroscopy (XANES) measurement shows that Eo of Se experiences a pressure-induced shift to high energy, evidencing strongly charge transfer between Fe and Se under high pressure. Our results shed lights on the correlation between crystallographic/electronic structure and superconductivity in this material.},
doi = {10.1016/j.jallcom.2018.07.161},
journal = {Journal of Alloys and Compounds},
number = C,
volume = 767,
place = {United States},
year = {Tue Jul 17 00:00:00 EDT 2018},
month = {Tue Jul 17 00:00:00 EDT 2018}
}
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