Temperature Dependence of the Local Structure and Iron Magnetic Moment in the Self-Doped CaKFe4As4Iron-Based Superconductor

F. Stramaglia; G. M. Pugliese; L. Tortora; L. Simonelli; C. Marini; W. Olszewski; S. Ishida; A. Iyo; H. Eisaki; T. Mizokawa; N. L. Saini

doi:10.1021/acs.jpcc.1c02379

Temperature Dependence of the Local Structure and Iron Magnetic Moment in the Self-Doped CaKFe₄As₄Iron-Based Superconductor

F. Stramaglia, G. M. Pugliese, L. Tortora, L. Simonelli, C. Marini, W. Olszewski, S. Ishida, A. Iyo, H. Eisaki, T. Mizokawa, N. L. Saini^*

^*Corresponding author for this work

School of Advanced Science and Engineering

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

Temperature-dependent Fe K-edge extended X-ray absorption fine structure (EXAFS) and Fe Kβ X-ray emission spectroscopy (XES) measurements are used to study the local structure and local Fe magnetic moment in the self-doped CaKFe4As4 superconductor. The local Fe-As and Fe-Fe bond lengths show thermal expansion similar to the one found in other iron-based superconductors. The arsenic height from the Fe-Fe plane changes anomalously with a sharp decrease in the vicinity of the superconducting transition temperature. The Fe Kβ XES reveals that Fe in CaKFe4As4 is in the low spin state, and the local magnetic moment decreases sharply while the sample is cooled across the transition temperature. The results indicate importance of the magnetoelastic coupling in the superconductivity with a key role of interlayer atomic correlations in these materials.

Original language	English
Pages (from-to)	10810-10816
Number of pages	7
Journal	Journal of Physical Chemistry C
Volume	125
Issue number	19
DOIs	https://doi.org/10.1021/acs.jpcc.1c02379
Publication status	Published - 2021 May 20

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Energy(all)
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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10.1021/acs.jpcc.1c02379

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Stramaglia, F., Pugliese, G. M., Tortora, L., Simonelli, L., Marini, C., Olszewski, W., Ishida, S., Iyo, A., Eisaki, H., Mizokawa, T., & Saini, N. L. (2021). Temperature Dependence of the Local Structure and Iron Magnetic Moment in the Self-Doped CaKFe₄As₄Iron-Based Superconductor. Journal of Physical Chemistry C, 125(19), 10810-10816. https://doi.org/10.1021/acs.jpcc.1c02379

Stramaglia, F, Pugliese, GM, Tortora, L, Simonelli, L, Marini, C, Olszewski, W, Ishida, S, Iyo, A, Eisaki, H, Mizokawa, T & Saini, NL 2021, 'Temperature Dependence of the Local Structure and Iron Magnetic Moment in the Self-Doped CaKFe₄As₄Iron-Based Superconductor', Journal of Physical Chemistry C, vol. 125, no. 19, pp. 10810-10816. https://doi.org/10.1021/acs.jpcc.1c02379

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title = "Temperature Dependence of the Local Structure and Iron Magnetic Moment in the Self-Doped CaKFe4As4Iron-Based Superconductor",

abstract = "Temperature-dependent Fe K-edge extended X-ray absorption fine structure (EXAFS) and Fe Kβ X-ray emission spectroscopy (XES) measurements are used to study the local structure and local Fe magnetic moment in the self-doped CaKFe4As4 superconductor. The local Fe-As and Fe-Fe bond lengths show thermal expansion similar to the one found in other iron-based superconductors. The arsenic height from the Fe-Fe plane changes anomalously with a sharp decrease in the vicinity of the superconducting transition temperature. The Fe Kβ XES reveals that Fe in CaKFe4As4 is in the low spin state, and the local magnetic moment decreases sharply while the sample is cooled across the transition temperature. The results indicate importance of the magnetoelastic coupling in the superconductivity with a key role of interlayer atomic correlations in these materials. ",

author = "F. Stramaglia and Pugliese, {G. M.} and L. Tortora and L. Simonelli and C. Marini and W. Olszewski and S. Ishida and A. Iyo and H. Eisaki and T. Mizokawa and Saini, {N. L.}",

note = "Funding Information: The authors thank the ALBA CL AESS beamline staff for the support during the experimental run. N.L.S. acknowledges ZAIKEN, Waseda University (Project Number: 31010), for support under the joint research program. The work is partially supported by the Sapienza University of Rome and JSPS Kakenhi (Grant Nos. JP19H05823 and JP19H00659). Publisher Copyright: {\textcopyright} 2021 American Chemical Society.",

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T1 - Temperature Dependence of the Local Structure and Iron Magnetic Moment in the Self-Doped CaKFe4As4Iron-Based Superconductor

AU - Stramaglia, F.

AU - Pugliese, G. M.

AU - Tortora, L.

AU - Simonelli, L.

AU - Marini, C.

AU - Olszewski, W.

AU - Ishida, S.

AU - Iyo, A.

AU - Eisaki, H.

AU - Mizokawa, T.

AU - Saini, N. L.

N1 - Funding Information: The authors thank the ALBA CL AESS beamline staff for the support during the experimental run. N.L.S. acknowledges ZAIKEN, Waseda University (Project Number: 31010), for support under the joint research program. The work is partially supported by the Sapienza University of Rome and JSPS Kakenhi (Grant Nos. JP19H05823 and JP19H00659). Publisher Copyright: © 2021 American Chemical Society.

PY - 2021/5/20

Y1 - 2021/5/20

N2 - Temperature-dependent Fe K-edge extended X-ray absorption fine structure (EXAFS) and Fe Kβ X-ray emission spectroscopy (XES) measurements are used to study the local structure and local Fe magnetic moment in the self-doped CaKFe4As4 superconductor. The local Fe-As and Fe-Fe bond lengths show thermal expansion similar to the one found in other iron-based superconductors. The arsenic height from the Fe-Fe plane changes anomalously with a sharp decrease in the vicinity of the superconducting transition temperature. The Fe Kβ XES reveals that Fe in CaKFe4As4 is in the low spin state, and the local magnetic moment decreases sharply while the sample is cooled across the transition temperature. The results indicate importance of the magnetoelastic coupling in the superconductivity with a key role of interlayer atomic correlations in these materials.

AB - Temperature-dependent Fe K-edge extended X-ray absorption fine structure (EXAFS) and Fe Kβ X-ray emission spectroscopy (XES) measurements are used to study the local structure and local Fe magnetic moment in the self-doped CaKFe4As4 superconductor. The local Fe-As and Fe-Fe bond lengths show thermal expansion similar to the one found in other iron-based superconductors. The arsenic height from the Fe-Fe plane changes anomalously with a sharp decrease in the vicinity of the superconducting transition temperature. The Fe Kβ XES reveals that Fe in CaKFe4As4 is in the low spin state, and the local magnetic moment decreases sharply while the sample is cooled across the transition temperature. The results indicate importance of the magnetoelastic coupling in the superconductivity with a key role of interlayer atomic correlations in these materials.

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Temperature Dependence of the Local Structure and Iron Magnetic Moment in the Self-Doped CaKFe₄As₄Iron-Based Superconductor

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