Electronic and crystal structures ofLnFeAsO1-xHx(Ln= La, Sm) studied by x-ray absorption spectroscopy, x-ray emission spectroscopy, and x-ray diffraction : II pressure dependence
© 2021 IOP Publishing Ltd..
We examine electronic and crystal structures of iron-based superconductorsLnFeAsO1-xHx(Ln= La, Sm) under pressure by means of x-ray absorption spectroscopy (XAS), x-ray emission spectroscopy (XES), and x-ray diffraction. In LaFeAsO the pre-edge peak on high-resolution XAS at the Fe-Kabsorption edge gains in intensity on the application of pressure up to 5.7 GPa and it saturates in the higher pressure region. We found integrated-absolute difference values on XES forLn= La, corresponding to a spin state, decline on the application of pressure, and then it is minimized when theTcapproaches the maximum at around 5 GPa. In contrast, such the optimum value was not detected forLn= Sm. We reveal that the superconductivity is closely related to the lower spin state forLn= La unlike Sm case. We observed that As height from the Fe basal plane and As-Fe-As angle on the FeAs4tetrahedron forLn= La deviate from the optimum values of the regular tetrahedron in superconducting (SC) phase, which has been widely accepted structural guide to SC thus far. In contrast, the structural parameters were held near the optimum values up to ∼15 GPa forLn= Sm.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2021 |
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| Erschienen: |
2021 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:33 |
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| Enthalten in: |
Journal of physics. Condensed matter : an Institute of Physics journal - 33(2021), 25 vom: 28. Mai |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Yamamoto, Yoshiya [VerfasserIn] |
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| Links: |
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| Themen: |
Crystal structure |
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| Anmerkungen: |
Date Revised 31.05.2021 published: Electronic Citation Status PubMed-not-MEDLINE |
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| doi: |
10.1088/1361-648X/abfaf4 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM324446543 |
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| 100 | 1 | |a Yamamoto, Yoshiya |e verfasserin |4 aut | |
| 245 | 1 | 0 | |a Electronic and crystal structures ofLnFeAsO1-xHx(Ln= La, Sm) studied by x-ray absorption spectroscopy, x-ray emission spectroscopy, and x-ray diffraction |b II pressure dependence |
| 264 | 1 | |c 2021 | |
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| 500 | |a Date Revised 31.05.2021 | ||
| 500 | |a published: Electronic | ||
| 500 | |a Citation Status PubMed-not-MEDLINE | ||
| 520 | |a © 2021 IOP Publishing Ltd. | ||
| 520 | |a We examine electronic and crystal structures of iron-based superconductorsLnFeAsO1-xHx(Ln= La, Sm) under pressure by means of x-ray absorption spectroscopy (XAS), x-ray emission spectroscopy (XES), and x-ray diffraction. In LaFeAsO the pre-edge peak on high-resolution XAS at the Fe-Kabsorption edge gains in intensity on the application of pressure up to 5.7 GPa and it saturates in the higher pressure region. We found integrated-absolute difference values on XES forLn= La, corresponding to a spin state, decline on the application of pressure, and then it is minimized when theTcapproaches the maximum at around 5 GPa. In contrast, such the optimum value was not detected forLn= Sm. We reveal that the superconductivity is closely related to the lower spin state forLn= La unlike Sm case. We observed that As height from the Fe basal plane and As-Fe-As angle on the FeAs4tetrahedron forLn= La deviate from the optimum values of the regular tetrahedron in superconducting (SC) phase, which has been widely accepted structural guide to SC thus far. In contrast, the structural parameters were held near the optimum values up to ∼15 GPa forLn= Sm | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a crystal structure | |
| 650 | 4 | |a electronic structure | |
| 650 | 4 | |a high pressure | |
| 650 | 4 | |a iron superconductors | |
| 650 | 4 | |a pnictides and chalcogenides | |
| 650 | 4 | |a x-ray absorption spectra | |
| 650 | 4 | |a x-ray diffraction | |
| 700 | 1 | |a Yamaoka, Hitoshi |e verfasserin |4 aut | |
| 700 | 1 | |a Kawai, Takuma |e verfasserin |4 aut | |
| 700 | 1 | |a Yoshida, Masahiro |e verfasserin |4 aut | |
| 700 | 1 | |a Yamaura, Jun-Ichi |e verfasserin |4 aut | |
| 700 | 1 | |a Ishii, Kenji |e verfasserin |4 aut | |
| 700 | 1 | |a Onari, Seiichiro |e verfasserin |4 aut | |
| 700 | 1 | |a Uozumi, Takayuki |e verfasserin |4 aut | |
| 700 | 1 | |a Hariki, Atsushi |e verfasserin |4 aut | |
| 700 | 1 | |a Taguchi, Munetaka |e verfasserin |4 aut | |
| 700 | 1 | |a Kobayashi, Kensuke |e verfasserin |4 aut | |
| 700 | 1 | |a Lin, Jung-Fu |e verfasserin |4 aut | |
| 700 | 1 | |a Hiraoka, Nozomu |e verfasserin |4 aut | |
| 700 | 1 | |a Ishii, Hirofumi |e verfasserin |4 aut | |
| 700 | 1 | |a Tsuei, Ku-Ding |e verfasserin |4 aut | |
| 700 | 1 | |a Okanishi, Hiroshi |e verfasserin |4 aut | |
| 700 | 1 | |a Iimura, Soshi |e verfasserin |4 aut | |
| 700 | 1 | |a Matsuishi, Satoru |e verfasserin |4 aut | |
| 700 | 1 | |a Hosono, Hideo |e verfasserin |4 aut | |
| 700 | 1 | |a Mizuki, Jun'ichiro |e verfasserin |4 aut | |
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