Superconductivity at 56 K in samarium-doped SrFeAsF

G Wu; Y L Xie; H Chen; M Zhong; R H Liu; B C Shi; Q J Li; X F Wang; T Wu; Y J Yan; J J Ying; X H Chen

doi:10.1088/0953-8984/21/14/142203

Journal of Physics: Condensed Matter

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Superconductivity at 56 K in samarium-doped SrFeAsF

G Wu¹, Y L Xie¹, H Chen¹, M Zhong¹, R H Liu¹, B C Shi¹, Q J Li¹, X F Wang¹, T Wu¹, Y J Yan¹, J J Ying¹ and X H Chen

Published 9 March 2009 • IOP Publishing Ltd
Journal of Physics: Condensed Matter, Volume 21, Number 14 Citation G Wu et al 2009 J. Phys.: Condens. Matter 21 142203 DOI 10.1088/0953-8984/21/14/142203

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¹ Hefei National Laboratory for Physical Science at Microscale, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China

² Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China

³ Author to whom any correspondence should be addressed

Dates

Received 18 November 2008
Published 9 March 2009

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Abstract

We synthesized the samples Sr_1−xSm_xFFeAs with a ZrCuSiAs-type structure. These samples were characterized by resistivity and susceptibility. It is found that substitution of rare earth metal for alkaline earth metal in this system suppresses the anomaly in resistivity and induces superconductivity. Superconductivity at 56 K in nominal composition Sr_0.5Sm_0.5FFeAs is realized, indicating that the superconducting transition temperatures in the iron arsenide fluorides can reach as high as that in oxypnictides with the same structure.

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