Abstract
Abstract A series of GdFeAsO1−x F x (x=0,0.1, 0.2, and 0.25) samples have been synthesized with conventional solid-state method. The phase purity is significantly improved by using Fe2O3 as the source of oxygen, compared to those prepared using Gd2O3 as the precursor. The lattice parameters are found to shrink with increasing fluorine doping level. The F-doped samples show a superconducting transition with T c increasing with doping level, reaching T c=40.1 K at x=0.25. A pronounced Curie–Weiss-like paramagnetic background, which is usually attributed to the impurity phases, is found to be independent of the fluorine doping level and proven to come from the Gd3+ in the GdFeAsO1−x F x compound with the effective magnetic moment of Gd3+ being μ eff=7.83±0.05 μB. The extrapolated slope of \({dH}_{\mathrm{c2}}/dT|_{T=T_{\mathrm{c}}}\) in this system is about −4.5 T/K.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Takahashi, H., Igawa, K., Arii, K., Kamihara, Y., Hirano, M., Hosono, H.: Nature 453, 376–378 (2008)
Chen, G.F., Li, Z., Wu, D., Li, G., Hu, W.Z., Dong, J., Zheng, P., Luo, J.L., Wang, N.L.: Phys. Rev. Lett. 100, 247002 (2008)
Ren, Z.A., Yang, J., Lu, W., Yi, W., Che, G.C., Dong, X.L., Sun, L.L., Zhao, Z.X.: Mater. Res. Innov. 12, 105 (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.: Europhys. Lett. 82, 57002 (2008)
Chen, X.H., Wu, T., Wu, G., Liu, R.H., Chen, H., Fang, D.F.: Nature 453, 761–762 (2008)
Rotter, M., Tegel, M., Johrendt, D.: Phys. Rev. Lett. 101, 107006 (2008)
Chen, G.F., Li, Z., Li, G., Hu, W.Z., Dong, J., Zhang, X.D., Zheng, P., Wang, N.L., Luo, J.L.: Chin. Phys. Lett. 25, 3403 (2008)
Wu, G., Chen, H., Wu, T., Xie, Y.L., Yan, Y.J., Liu, R.H., Wang, X.F., Ying, J.J., Chen, X.H.: J. Phys. Condens. Matt. 20, 422201 (2008)
Qi, Y.P., Gao, Z.S., Wang, L., Wang, D.L., Zhang, X.P., Ma, Y.W.: New J. Phys. 10, 123003 (2008)
Hsu, F.C., Luo, J.Y., Yeh, K.W., Chen, T.K., Huang, T.W., Wu, P.M., Lee, Y.C., Huang, Y.L., Chu, Y.Y., Yan, D.C., Wu, M.K.: Proc. Natl. Acad. Sci. 105, 14262 (2008)
Chen, G.F., Li, Z., Wu, D., Dong, J., Li, G., Hu, W.Z., Zheng, P., Luo, J.L., Wang, N.L.: Chin. Phys. Lett. 25, 2235 (2008)
Cheng, P., Fang, L., Yang, H., Zhu, X.Y., Mu, G., Luo, H.Q., Wang, Z.S., Wen, H.H.: Sci. China G 51(6), 719 (2008)
Yang, J., Li, Z.C., Lu, W., Yi, W., Shen, X.L., Ren, Z.A., Che, G.C., Dong, X.L., Sun, L.L., Zhou, F., Zhao, Z.X.: Supercond. Sci. Technol. 21, 082001 (2008)
Wang, C., Li, L.J., Chi, S., Zhu, Z.W., Ren, Z.A., Li, Y.K., Wang, Y.T., Lin, X., Luo, Y.K., Xu, X.F., Cao, G.H., Xu, Z.A.: Europhys. Lett. 83, 67006 (2008)
Kadowaki, K., Goya, T., Mochiji, T., Chong, S.V.: J. Phys. Conf. Ser. 150, 052088 (2009)
Chen, Y.L., Cui, Y.J., Yang, Y., Zhang, Y., Wang, L., Cheng, C.H., Sorrell, C., Zhao, Y.: Supercond. Sci. Technol. 21, 115014 (2008)
Liu, R.H., Wu, G., Wu, T., Fang, D.F., Chen, H., Li, S.Y., Liu, K., Xie, Y.L., Wang, X.F., Yang, R.L., Ding, L., He, C., Feng, D.L., Chen, X.H.: Phys. Rev. Lett. 101, 087001 (2008)
Yamani, Z., Akhavan, M.: Phys. Rev. B 56, 7894 (1997)
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Cui, Y.J., Chen, Y.L., Cheng, C.H. et al. Magnetic Properties and Superconductivity in GdFeAsO1−x F x . J Supercond Nov Magn 23, 625–628 (2010). https://doi.org/10.1007/s10948-010-0699-7
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10948-010-0699-7