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Iyo A, Kawashima K, Kinjo T, et al. New-Structure-Type Fe-Based Superconductors: CaAFe4As4 (A = K, Rb, Cs) and SrAFe4As4 (A = Rb, Cs). J Am Chem Soc. 2016;138(10):3410-5doi: 10.1021/jacs.5b12571.
Iyo, A., Kawashima, K., Kinjo, T., Nishio, T., Ishida, S., Fujihisa, H., Gotoh, Y., Kihou, K., Eisaki, H., & Yoshida, Y. (2016). New-Structure-Type Fe-Based Superconductors: CaAFe4As4 (A = K, Rb, Cs) and SrAFe4As4 (A = Rb, Cs). Journal of the American Chemical Society, 138(10), 3410-5. https://doi.org/10.1021/jacs.5b12571
Iyo, Akira, et al. "New-Structure-Type Fe-Based Superconductors: CaAFe4As4 (A = K, Rb, Cs) and SrAFe4As4 (A = Rb, Cs)." Journal of the American Chemical Society vol. 138,10 (2016): 3410-5. doi: https://doi.org/10.1021/jacs.5b12571
Iyo A, Kawashima K, Kinjo T, Nishio T, Ishida S, Fujihisa H, Gotoh Y, Kihou K, Eisaki H, Yoshida Y. New-Structure-Type Fe-Based Superconductors: CaAFe4As4 (A = K, Rb, Cs) and SrAFe4As4 (A = Rb, Cs). J Am Chem Soc. 2016 Mar 16;138(10):3410-5. doi: 10.1021/jacs.5b12571. Epub 2016 Mar 04. PMID: 26943024.
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J Am Chem Soc. 2016 Mar 16;138(10):3410-5. doi: 10.1021/jacs.5b12571. Epub 2016 Mar 04.

New-Structure-Type Fe-Based Superconductors: CaAFe4As4 (A = K, Rb, Cs) and SrAFe4As4 (A = Rb, Cs).

Journal of the American Chemical Society

Akira Iyo, Kenji Kawashima, Tatsuya Kinjo, Taichiro Nishio, Shigeyuki Ishida, Hiroshi Fujihisa, Yoshito Gotoh, Kunihiro Kihou, Hiroshi Eisaki, Yoshiyuki Yoshida

Affiliations

  1. National Institute of Advanced Industrial Science and Technology (AIST) , 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan.
  2. IMRA Material R&D Co., Ltd. , 2-1 Asahi-machi, Kariya, Aichi 448-0032, Japan.
  3. Department of Physics, Tokyo University of Science , 1-3 Kagurazaka, Shinjuku, Tokyo 162-8601, Japan.

PMID: 26943024 DOI: 10.1021/jacs.5b12571

Abstract

Fe-based superconductors have attracted research interest because of their rich structural variety, which is due to their layered crystal structures. Here we report the new-structure-type Fe-based superconductors CaAFe4As4 (A = K, Rb, Cs) and SrAFe4As4 (A = Rb, Cs), which can be regarded as hybrid phases between AeFe2As2 (Ae = Ca, Sr) and AFe2As2. Unlike solid solutions such as (Ba(1-x)K(x))Fe2As2 and (Sr(1-x)Na(x))Fe2As2, Ae and A do not occupy crystallographically equivalent sites because of the large differences between their ionic radii. Rather, the Ae and A layers are inserted alternately between the Fe2As2 layers in the c-axis direction in AeAFe4As4 (AeA1144). The ordering of the Ae and A layers causes a change in the space group from I4/mmm to P4/mmm, which is clearly apparent in powder X-ray diffraction patterns. AeA1144 is the first known structure of this type among not only Fe-based superconductors but also other materials. AeA1144 is formed as a line compound, and therefore, each AeA1144 has its own superconducting transition temperature of approximately 31-36 K.

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