Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
권호 표지
DOI QR코드

DOI QR Code

Fabrication details of Ba1-xKxFe2As2 films by pulsed laser deposition technique

  • Lee, Nam Hoon (BK21 Physics division and Department of Physics, Sungkyunkwan University) ;
  • Jung, Soon-Gil (BK21 Physics division and Department of Physics, Sungkyunkwan University) ;
  • Ranot, Mahipal (BK21 Physics division and Department of Physics, Sungkyunkwan University) ;
  • Kang, Won Nam (BK21 Physics division and Department of Physics, Sungkyunkwan University)
  • Received : 2014.05.22
  • Accepted : 2014.06.25
  • Published : 2014.09.30
Download PDF
⟨ Previous Next ⟩

Abstract

Among Fe-based superconductors, potassium doped $BaFe_2As_2$ is favorable for applications because of its relatively high transition temperature and low anisotropy. To study the superconducting properties and the applicable aspects, high quality thin films of potassium doped $BaFe_2As_2$ should be fabricate. However, the high volatility of potassium makes it difficult to fabricate thin films of this compound. In this paper, we discuss the details of the experimental conditions used to fabricate $Ba_{1-x}K_xFe_2As_2$ films by ex situ PLD method. In the first set of samples, barium ratio in the target was controlled to make films with various potassium doping rate. However, in the second set of samples, the amount of potassium was controlled to find out optimal conditions for making high quality $Ba_{1-x}K_xFe_2As_2$ films.

Keywords

References

  1. Y. Kamihara, T. Watanabe, M. Hirano, and H. Hosono, "Iron-based layered superconductor La[$O_{1-x}F_{x}$]FeAs (x = 0.05-0.12) with $T_c$ = 26 K," J. Am. Chem. Soc., 130, 3296, 2000.
  2. J. Yang, Z. Li, W. Lu, W. Yi, X.-L. Shen, Z.-A.Ren, G.-C. Che et al., "Superconductivity at 53.5 K in $GdFeAsO_{1-\delta}$," Supercond. Sci. Technol; 21, 082001, 2008. https://doi.org/10.1088/0953-2048/21/8/082001
  3. Z.-A. Ren, W. Lu, J. Yang, W. Yi, X.-L. Shen, Z.-C. Li et al., Superconductivity at 55K in Iron-based F-doped layered quaternary compound Sm[$O_{1-x}F_{x}$]FeAs," Chin. Phys. Lett; 25, 2215, 2008. https://doi.org/10.1088/0256-307X/25/6/080
  4. T. Hanaguri, S. Niitaka, K. Kuroki, and H. Takagi, "Unconventional s-wave superconductivity in Fe(Se,Te)," Science, 328, 474, 2010. https://doi.org/10.1126/science.1187399
  5. H. Q. Yuan, J. Singleton, F. F. Balakirev, S. A. Baily, G. F. Chen, J. L. Luo, and N. L. Wang,."Nearly isotropic superconductivity in (Ba,K)$Fe_2As_2$," Nature; 457, 565, 2009. https://doi.org/10.1038/nature07676
  6. N. Ni, S. L. Bud'ko, A. Kreyssig, S. Nandi, G. E. Rustan, A. I. Goldman et al., "Anisotropic thermodynamic and transport properties of single-crystalline $Ba_{1−x}K_xFe_2As_2$ (x=0 and 0.45)," Phys. Rev. B; 78, 014507, 2008. https://doi.org/10.1103/PhysRevB.78.014507
  7. M. Putti, I. Pallecchi, E. Bellingeri, M. R. Cimberle, M. Tropeano, C. Ferdeghini et al., "New Fe-based superconductors: properties relevant for applications," Supercond. Sci. Technol; 23 034003, 2010. https://doi.org/10.1088/0953-2048/23/3/034003
  8. C. Ren, Z. S. Wang, H. Q. Luo, H. Yang, L. Shan, and H. H. Wen, "Evidence for two energy gaps in superconducting $Ba_{0.6}K_{0.4}Fe_2As_2$ single crystals and the breakdown of the Uemura Plot," Phys. Rev. Lett; 101, 257006, 2008. https://doi.org/10.1103/PhysRevLett.101.257006
  9. N. H. Lee, S.-G. Jung, D. H. Kim, and W. N. Kang, "Potassium-doped $BaFe_2As_2$ superconducting thin films with a transition temperature of 40 K," Appl. Phys. Lett; 96, 202505, 2010. https://doi.org/10.1063/1.3431583
  10. S. Lee, J. Jiang, Y. Zhang, C. W. Bark, J. D. Weiss, and C. Tarantini et al., "Template engineering of Co-doped $BaFe_2As_2$ single-crystal thin films," Nature Mater; 9, 397, 2010. https://doi.org/10.1038/nmat2721
  11. E. M. Choi, S.-G. Jung, N. H. Lee, Y. S. Kwon, W. N. Kang, D. H. Kim, M. H. Jung, S.-I. Lee, and L. Sun, "In situ fabrication of cobalt-doped $SrFe_2As_2$ thin films by using pulsed laser deposition with excimer laser," Appl. Phys. Lett; 95, 062507, 2008.

Cited by

  1. Recent progress in thin-film growth of Fe-based superconductors: superior superconductivity achieved by thin films vol.31, pp.9, 2018, https://doi.org/10.1088/1361-6668/aabddb
  2. Realization of epitaxial thin films of the superconductor K-doped $ \mathrm{Ba}\mathrm{Fe}_{2}\mathrm{As}_{2}$ vol.5, pp.1, 2014, https://doi.org/10.1103/physrevmaterials.5.014801