Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

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

DOI QR Code

Enhancement of lower critical field of MgB2 thin films through disordered MgB2 overlayer

  • Soon-Gil, Jung (Center for Quantum Materials and Superconductivity (CQMS), Sungkyunkwan University) ;
  • Duong, Pham (Department of Physics, Sungkyunkwan University) ;
  • Won Nam, Kang (Department of Physics, Sungkyunkwan University) ;
  • Byung-Hyuk, Jun (Materials Safety Technology Development Division, Korea Atomic Energy Research Institute) ;
  • Chorong, Kim (Korea Multi-purpose Accelerator Complex, Korea Atomic Energy Research Institute) ;
  • Sunmog, Yeo (Korea Multi-purpose Accelerator Complex, Korea Atomic Energy Research Institute) ;
  • Tuson, Park (Center for Quantum Materials and Superconductivity (CQMS), Sungkyunkwan University)
  • Received : 2022.11.28
  • Accepted : 2022.12.28
  • Published : 2022.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

We investigate the effect of surface disorder on the lower critical field (Hc1) of MgB2 thin films with a thickness of 850 nm, where the disorder on the surface region is produced by the irradiation of 140 keV Co ions with the dose of 1 × 1014 ions/cm2. The thickness of the damaged region by the irradiation is around 143 nm, corresponding to ~17% of the whole thickness of the film, thereby forming the disordered MgB2 overlayer on the pure MgB2 layer. The magnetic field dependence of magnetization, M(H), for the pristine MgB2 thin film and the film with overlayer is measured at various temperatures, and Hc1 is determined from the difference (△M) between the Meissner line and magnetization signal with the criterion of △M = 10-3 emu. Intriguingly, the film with the disordered overlayer shows a remarkably large Hc1(0) = 108 Oe compared to the Hc1(0) = 84 Oe of pristine film, indicating that the disordered MgB2 overlayer on the pure MgB2 layer serves to prevent the penetration of vortices into the sample. These results provide new ideas for improving the superheating field to design high-performance superconducting radio-frequency cavities.

Keywords

Acknowledgement

We wish to acknowledge the support of the accelerator group and operators of KOMAC (KAERI). This study was supported by the National Research Foundation (NRF) of Korea through a grant funded by the Korean Ministry of Science and ICT (No. 2021R1A2C2010925) and by the Basic Science Research Program through the NRF of Korea funded by the Ministry of Education (NRF-2019R1F1A1055284 and NRF-2021R1I1A1A01043885). This work was also supported by the National Research Foundation Grant (NRF-2020M2D8A2047959) funded from Ministry of Science and ICT (MSIT) of Republic of Korea.

References

  1. J. Nagamatsu, N. Nakagawa, T. Muranaka, Y. Zenitani, and J. Akimitsu, "Superconductivity at 39 K in magnesium diboride," Nature, vol. 410, pp. 63-64, 2001.  https://doi.org/10.1038/35065039
  2. M. Angst, S. L. Bud'ko, R. H. T. Wilke, and P. C. Canfield, "Difference between Al and C doping in anisotropic upper critical field development in MgB2," Phys. Rev. B, vol. 71, pp.144512, 2005. 
  3. D. C. Larbalestier, A. Gurevich, D. M. Feldmann, and A. Polyanskii, "Enhancement of the high-magnetic-field critical current density of superconducting MgB2 by proton irradiation," Nature, vol. 414, pp. 368-377, 2001.  https://doi.org/10.1038/35104654
  4. M. Angst, S. L. Bud'ko, R. H. T. Wilke, and P. C. Canfield, "Difference between Al and C doping in anisotropic upper critical field development in MgB2," Phys. Rev. B, vol. 71, pp.144512, 2005. 
  5. S. -G. Jung, et al., "A simple method for the enhancement of Jc in MgB2 thick films with an amorphous SiC impurity layer," Supercond. Sci. Technol., vol. 22, pp. 075010, 2009. 
  6. K. Vinod, R. G. A. Kumar, and U. Syamaprasad, "Prospects for MgB2 superconductors for magnet application," Supercond. Sci. Technol., vol. 20, pp. R1-R13, 2007.  https://doi.org/10.1088/0953-2048/20/1/R01
  7. H. -J. Kim, W. N. Kang, E. -M. Choi, M. -S. Kim, K. H. P. Kim, and S. -I. Lee, "High current-carrying capability in c-axis-oriented superconducting MgB2 thin films", Phys. Rev. Lett., vol. 87, pp. 087002, 2001. 
  8. D. C. Larbalestier, et al., "Strongly linked current flow in polycrystalline forms of the superconductor MgB2," Nature, vol. 410, pp. 186-189, 2001.  https://doi.org/10.1038/35065559
  9. D. Y. Bugoslavsky, et al., "High-Tc superconducting materials for electric power applications," Nature, vol. 411, pp. 561-563, 2001.  https://doi.org/10.1038/35079024
  10. M. Parizh, Y. Lvovsky, and M. Sumption, "Conductors for commercial MRI magnets beyond NbTi: requirements and challenges," Supercond. Sci. Technol., vol. 30, pp. 014007, 2017. 
  11. H. Padamsee, "The science and technology of superconducting cavities for accelerators," Supercond. Sci. Technol., vol. 14, pp. R28-R51, 2001.  https://doi.org/10.1088/0953-2048/14/4/202
  12. X. Han, C. -L. Zou, W. Fu, M. Xu, Y. Xu, and H. X. Tang, "Superconducting Cavity Electromechanics: The Realization of an Acoustic Frequency Comb at Microwave Frequencies", Phys. Rev. Lett., vol. 129, pp. 107701, 2022.  
  13. B. B. Jin, et al., "Energy gap, penetration depth, and surface resistance of MgB2 thin films determined by microwave resonator measurements", Phys. Rev. B, vol. 66, pp. 104521, 2002. 
  14. T. Tan, et al., "Enhancement of lower critical field by reducing the thickness of epitaxial and polycrystalline MgB2 thin films", APL Mater., vol. 3, pp. 041101, 2015. 
  15. M. K. Transtrum, G. Catelani, and J. P. Sethna, "Superheating field of superconductors within Ginzburg-Landau theory", Phys. Rev. B, vol. 83, pp. 094505, 2011. 
  16. Z. Lin, et al., "Enhancement of the lower critical field in FeSe-coated Nb structures for superconducting radio-frequency applications," Supercond. Sci. Technol., vol. 34, pp. 015001, 2021. 
  17. A. Gurevich, "Enhancement of rf breakdown field of superconductors by multilayer coating," Appl. Phys. Lett., vol. 88, pp. 012511, 2006. 
  18. C. Z. Antoine, J. -C. Villegier, and G. Martinet, "Study of nanometric superconducting multilayers for RF field screening applications," Appl. Phys. Lett., vol. 102, pp. 102603, 2013. 
  19. W. K. Seong, et al., "Growth of superconducting MgB2 thin films by using hybrid physical-chemical vapor deposition", J. Korean Phys. Soc., vol. 51, pp. 174-177, 2007.  https://doi.org/10.3938/jkps.51.174
  20. W. K. Seong, S. Oh, and W. N. Kang, "Perfect domain-lattice matching between MgB2 and Al2O3: single-crystal MgB2 thin films grown on sapphire", Jpn. J. Appl. Phys., vol. 51, pp. 083101, 2012. 
  21. The damage events by 140-kev Co ion irradiation in the MgB2 were calculated using the SRIM software (www.srim.org/) 
  22. S. -G. Jung, et al., "Improvement of bulk superconducting current capability of MgB2 films using surface degradation," Scr. Mater., vol. 209, pp. 114424, 2022. 
  23. A. A. Baker, et al., "Control of superconductivity in MgB2 by ion bombardment," J. Phys. D: Appl. Phys., vol. 52, pp. 295302, 2019. 
  24. D. M. Parkin, "Radiation effects in high-temperature superconductors: A brief review," Metall. Mater. Trans. A, vol. 21, pp. 1015-1019, 1990.  https://doi.org/10.1007/BF02656523
  25. S. -G. Jung, et al., "Influence of carbon-ion irradiation on the superconducting critical properties of MgB2 thin films," Supercond. Sci. Technol., vol. 32, pp. 025006, 2019. 
  26. S. -G. Jung, et al., "Effect of thermal annealing on low-energy C-ion irradiated MgB2 thin films," Progress in Superconductivity and Cryogenics, vol. 21, pp. 13-17, 2019. 
  27. E. H. Brandt, "Geometric edge barrier in the Shubnikov phase of type-II superconductors," Low. Temp. Phys., vol. 27, pp. 723-731, 2001.  https://doi.org/10.1063/1.1401181
  28. T. Matsushita, "On the surface barrier in type II superconductors," J. Phys. Soc. Jpn., vol. 52, pp. 241-245, 1983.  https://doi.org/10.1143/JPSJ.52.241
  29. S. T. Renosto, et al., "Evidence of multiband behavior in the superconducting alloy Zr0.96,/sub>V0.04B2," Phys. Rev. B, vol. 87, pp. 174502, 2013. 
  30. S. -G. Jung, et al., "Giant proximity effect in single-crystalline MgB2 bilayers," Sci. Rep., vol. 9, pp. 3315, 2019. 
  31. S. -G. Jung, et al., "Field-induced quantum breakdown of superconductivity in magnesium diboride," NPG Asia Mater., vol. 13, pp. 55, 2021. 
  32. S. Takahashi and M. Tachiki, "New phase diagram in superconducting superlattices," Phys. Rev. B, vol. 34, pp. 3162-3164, 1986.  https://doi.org/10.1103/physrevb.34.3162
  33. F. S. Portela, et al., "Superconducting properties of Nb/Pb/Nb trilayer," Supercond. Sci. Technol., vol. 28, pp. 034001, 2015.