Earticle

초록

영어

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 X 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 (ΔM) 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.

목차

Abstract
1. INTRODUCTION
2. EXPERIMENTAL METHODS
3. RESULTS AND DISCUSSION
4. CONCLUSION
ACKNOWLEDGMENTS
REFERENCES

키워드

저자

• Soon-Gil Junga [ Center for Quantum Materials and Superconductivity (CQMS), Sungkyunkwan University, Department of Physics, Sungkyunkwan University, Suwon 16419, Korea ]
• Duong Pham [ Department of Physics, Sungkyunkwan University, Suwon 16419, Korea ]
• Won Nam Kang [ Department of Physics, Sungkyunkwan University, Suwon 16419, Korea ]
• Byung-Hyuk Jun [ Materials Safety Technology Development Division, Korea Atomic Energy Research Institute, Daejeon 34057, Korea ]
• Chorong Kim [ Korea Multi-purpose Accelerator Complex, Korea Atomic Energy Research Institute, Gyeongju, Gyeongbuk, 38180, Korea ]
• Sunmog Yeo [ Korea Multi-purpose Accelerator Complex, Korea Atomic Energy Research Institute, Gyeongju, Gyeongbuk, 38180, Korea ]
• Tuson Park [ Center for Quantum Materials and Superconductivity (CQMS), Sungkyunkwan University, Department of Physics, Sungkyunkwan University, Suwon 16419, Korea ] Corresponding author

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  한국초전도·저온논문지 (구 한국초전도저온공학회논문지) [Progress in Superconductivity and Cryogenics]

• 간기

  계간

• pISSN

  1229-3008

• eISSN

  2287-6251

• 수록기간

  1999~2026

• 등재여부

  KCI 등재,SCOPUS

• 십진분류

  KDC 427 DDC 537