Abstract
For iron-based superconductors, both the in-plane and out-of-plane doping can cause the superconductivity. In this contribution, we investigated both the electronic structure and local lattice structure induced by in-plane and out-of-plane doping in SmFeAsO-based superconductors probed by X-ray absorption spectroscopy. Data pointed out that upon out-of-plane doping the charge reservoir layers and superconductive layers become closer, enhancing the electron transfer from SmO to FeAs layers, and in the end, almost all the electron carriers were gathered around Fe atoms. On the other hand, for in-plane doping, we observed the elongation of Sm–As bonds but the shrinkage of FeAs layers that promoted the transfer of electron carriers on superconductive layers. Accordingly, it is because of the heterogeneous structural distortions that lead to the different superconducting mechanism of in-plane and out-of-plane doping in iron-based superconductors.
Similar content being viewed by others
References
Kamihara, Y., Watanabe, T., Hirano, M., Hosono, H.: Iron-based layered superconductor La[O 1−x F x ]FeAs (x= 0.05 −.12) with T c= 26 K. J. Am. Chem. Soc 130, 3296–7 (2008)
Grant, P.M.: Superconductivity: Prospecting for an iron age. Nature 453, 1000–1 (2008)
Ren, Z.-A., Zhao, Z.-X.: Research and prospects of iron-based superconductors. Adv. Mater 21, 4584–92 (2009)
Chiao, M.: Superconductivity: has lightning struck twice? Nat. Phys 4, 446 (2008)
Bednorz, J.G., Muller, K.A.: Possible high T c superconductivity in the Ba-La-Cu-O system. Z. Phys. B 64, 189–93 (1986)
Sadovskii, M.V.: High-temperature superconductivity in iron-based layered iron compounds. Phys. Usp 51, 1201–27 (2008)
Sefat, A.S., Jin, R., McGuire, M.A., Sales, B.C., Singh, D.J., Mandrus, D.: Superconductivity at 22 K in Co-doped BaFe 2As 2 crystals. Phys. Rev. Lett 101, 117004 (2008)
Ren, Z.A., Yang, J., Lu, W., Yi, W., Shen, X.L., Li, Z.C., Che, G.C., Dong, X.L., Sun, L.L., Zhou, F., Zhao, Z.X.: Superconductivity in the iron-based F-doped layered quaternary compound Nd[O 1−x ]FeAs. Europhys. Lett 82, 57002 (2008)
Lee, S.C., Kawabata, A., Moyoshi, T., Kobayashi, Y., Sato, M.: Distince transport behaviors of LaFe 1−y Co y AsO 1−x F x (x=0.11) between the superconducting and nonsuperconducting metallic y regions divided by y∼ 0.05. J. Phys. Soc. 78, 043703 (2009)
Chen, X.H., Wu, T., Wu, G., Liu, R.H., Chen, H., Fang, D.F.: Superconductivity at 43K in SmFeAsO 1−x F x . Nature 453, 761–2 (2008)
Li, Y.K., Lin, X., Zhou, T., Shen, J.Q., Tao, Q., Cao, G.H., Xu, Z.A.: Superconductivity induced by Ni doping in SmFe 1−x Ni x AsO. J. PHYS.: Condens. Matter 21, 355702 (2009)
Cheng, J., Chu, W. S., Wu, G., Zhao, H. F., Xu, W., Zhou, J., Zhang, L. J., Chen, X. H., Wu, Z. Y.: Potassium doping effect on the lattice softening and electronic structure of Ba 1−x K x Fe 2As 2 probed by X-ray absorption spectroscopy. J. Synchrotron Rad 17, 730–6 (2010)
Cheng, J., Dong, P., Chu, W., Xu, W., Wen, H., Marcelli, A., Wu, Z.: Strikingly dissimilar effect of Mn and Zn dopants imposed on local structural distortion of Ba 0.5 K 0.5Fe 2As 2 superconductor. J. Synchrotron Rad 20, 455–9 (2013)
Lee, C.H., Iyo, A., Eisaki, H., Kito, H., Fernandez-Diaz, M.T., Ito, T., Kihou, K., Matsuhata, H., Braden, M., Yamada, K.: Effect of structural parameters on superconductivity in fluorine-free LnFeAsO 1−y (Ln = La, Nd). J. Phys. Soc. Jpn 77, 083704 (2008)
Mizuguchi, Y., Hara, Y., Deguchi, K., Tsuda, S., Yamaguchi, T., Takeda, K., Tou, H., Takano, Y.: Anion height dependence of T c for the Fe-based superconductor. Supercond. Sci. Technol 23, 054013 (2010)
Cheng, J., Zhou, J., Hu, R., Xu, W., Li, Y.K., Zhang, L.J., Marcelli, A., Chu, W.S., Xu, Z.A., Wu, Z.Y.: Charge redistribution and local lattice structure of (F, Zn)-codoped LaFeAsO superconductor. New J. Phys 14, 033005 (2012)
Chu, W., Cheng, J., Chu, S., Hu, T., Marcelli, A., Chen, X., Wu, Z.: Iron isotope effect and local lattice dynamics in the (Ba, K)Fe 2As 2 superconductor studied by temperature-dependent EXAFS. Sci. Rep 3, 1750 (2013)
Newville, M.: IFEFFIT: Interactive EXAFS analysis and FEFF fitting. J. Synchrotron Rad 8, 322–4 (2001)
Crocombette, J. P., Pollak, M., Jollet, F., Thromat, N., Gautier-Soyer, M.: X-ray-absorption spectroscopy at the Fe L 2,3 threshold in iron oxides. Phys. Rev. B 52, 3143 (1995)
de Groot, F.M.F., Fuggle, J.C., Thole, B.T., Sawatzky, G.: A.: 2p x-ray absorption of 3d transition-metal compounds: an atomic multiplet description including the crystal field. Phys. Rev. B 42, 5459 (1990)
Laan, G.v.d., Kirkman, I.W.: The 2p absorption spectra of 3d transition metal compounds in tetrahedral and octahedral symmetry. J. Phys. Condens. Matter 4, 4189–4204 (1992)
Acknowledgments
This work was partly supported by the Natural Science Foundation of China (NSFC 11405089), the Natural Science Foundation of Jiangsu Province of China (Nos. BK20130855 and BK20130376), and the Scientific Research Foundation of Nanjing University of Posts and Telecommunications (Nos. NY213053 and NY213181).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Cheng, J., Xu, W., Liu, L. et al. Heterogeneous Structural Distortions Induced by In-Plane and Out-of-Plane Doping in Iron-Based Superconductors. J Supercond Nov Magn 27, 2719–2723 (2014). https://doi.org/10.1007/s10948-014-2826-3
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10948-014-2826-3