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Effect of Sodium Substitution on Structural and Magnetic Properties of KFe2−y Se2

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Abstract

We have synthesized the superconducting K1−x Na x Fe2−y Se2 (x = 0.07 and 0.25) crystal by using the flux technique. SEM images demonstrate that two samples consist of successive plate-like surfaces oriented into ab plane. EDS analysis yields the average compositions as (Na0.20K0.80)0.96Fe1.78Se2for x = 0.07 and (Na0.33K0.67)0.96Fe1.73Se2 for x = 0.25. XRD pattern gives the (00 ℓ) peaks. The main peaks are indexed to the I4/m space group corresponding to reflected intensities from (002), (006), (008), and (0010) planes related to the peaks of the phase K2Fe4Se5. The lattice parameters are calculated as a = 8.701(4) and c = 14.185(2) Å for x = 0.07, and a = 8.689(3) and c = 14.054(4) Å for x = 0.25. ZFC magnetization measurement exhibits a very sharp transition which indicates the presence of superconductivity in the crystal. The superconducting transition temperatures, T c , obtained from magnetization measurements are estimated to be 31.0 and 28.4 K for x = 0.07 and 0.25, respectively. The critical current value, J c (0), deduced from the M−H loops are approximately 2.8 ×104 A/cm 2 for x = 0.07 and 2.87 ×102 A/cm 2 for x = 0.25 at 5 K. The volume pinning force, F p , of x = 0.07 sample is found larger than that of the x = 0.25 one.

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Acknowledgments

This work is supported by the Scientific and Technological Research Council of Turkey (TUBITAK) under Grant No. 112T767 and Research Fund of Cukurova University, Adana, Turkey, under grant contract no.: FDK-2015-4036. LM, IM, and AB would like to acknowledge the financial support by the Volkswagen Foundation and the Russian Foundation for Basic Research (Grant No. 15-03-99628). The authors wish to thank Dr. Sabine Wurmehl, Michael Schulze and Prof. B. Büchner, from IFW Dresden (Germany) for their hospitality and support during the preparation of the sample.

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Authors and Affiliations

  1. Department of Physics, Faculty of Sciences and Letters, Çukurova University, Adana, Turkey

    M. Gürsul, B. Özçelik & A. Ekicibil

  2. Lomonosov Moscow State University, GSP-1, Leninskie Gory, 119991, Moscow, Russian Federation

    M. Liu, A. I. Boltalin & I. V. Morozov

  3. IFW-Dresden, Helmholtzstrasse 20, 01069, Dresden, Germany

    M. Liu & I. V. Morozov

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  1. M. Gürsul
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  2. B. Özçelik
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  3. A. Ekicibil
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  4. M. Liu
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  5. A. I. Boltalin
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  6. I. V. Morozov
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Correspondence to B. Özçelik.

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Gürsul, M., Özçelik, B., Ekicibil, A. et al. Effect of Sodium Substitution on Structural and Magnetic Properties of KFe2−y Se2 . J Supercond Nov Magn 29, 2401–2406 (2016). https://doi.org/10.1007/s10948-016-3558-3

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  • DOI: https://doi.org/10.1007/s10948-016-3558-3

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