Speaker
Description
Magnesium diboride (MgB$_2$) is a conventional superconductor that has high critical temperature (T$_c$ ~ 39 K) and current density (J$_c$), making it a promising candidate for various applications [1]. Ion irradiation on MgB$_2$ thin films induces disorder through atomic lattice displacement, which reduces T$_c$ [2,3]. In this study, we investigated the influence of He ion irradiation on the MgB$_2$ thin films with thicknesses of 170 nm and 570 nm, under various irradiation doses. The changes in crystallinity and superconducting transition temperature of irradiated MgB$_2$ thin films were observed by x-ray diffraction (XRD) and electrical resistivity measurements, respectively. Our results showed that all main peaks in the XRD patterns shifted due to He ion irradiation. As the dose increased, T$_c$ systematically decreased. However, even at the highest dose ($4.8\times 10^{16}$ ions/cm$^2$), T$_c$ remains significant, around 8 K, which suggests that the superconductivity of MgB$_2$ thin films remains robust despite the disorder induced by He ion irradiation. Furthermore, we will discuss the recovery of T$_c$ through thermal annealing on the irradiated MgB$_2$ thin films.
[1] Nagamatsu, J., Nakagawa, N., Muranaka, T. et al., “Superconductivity at 39 K in magnesium diboride” Nature 410, 63–64 (2001)
[2] Soon-Gil Jung et al., ”Influence of carbon-ion irradiation on the superconducting critical properties of MgB$_2$ thin films” Supercond. Sci. Technol. 32 (2019) 025006
[3] Jung Min Lee et al., “Influence of disorder strength on the superconducting mechanism of MgB$_2$” Supercond. Sci. Technol. 35 (2022) 015001
| Contribution track | KOPUA |
|---|---|
| Paper submission Plan | No |
| Best Presentation | No |
