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<p>In this study we present the effect of the irradiation of sintered MgB<sub>2</sub> with protons of intermediate energies, from 8.6 to 15.07&#xa0;MeV, at a constant fluence of 2.86 × 10<sup>16</sup> p/cm<sup>2</sup>. We found clear evidence that the disorder generated by irradiation leads to a weak suppression of the critical temperature <i>T</i><sub>c</sub> and an increase of the critical current density <i>J</i><sub>c</sub> with increasing proton energy, as expected. However, it was found that thermomagnetic instabilities and vortex creep phenomena strongly depend on the ratio between proton range and the sample thickness. The number of the macroscopic flux jumps (MFJ) is highest and manifest up to 28&#xa0;K in the sample with the proton range shorter than sample thickness (P<sub>1</sub>) and decrease as the proton energy increases. Similarly, the relaxation rate of the irreversible magnetization is the lowest in the sample P<sub>1</sub> and increases with proton energy. We tentatively attribute this effect to the protons that stop within MgB<sub>2</sub> and interact with the local structure/atomic composition.</p>

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Effect of Proton Energy on the Superconducting Properties of MgB2 Submitted to Proton Beams at a Constant Fluence

  • 期刊论文

  • 发表日期：

    2025年7月31日

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  • V. Sandu,
  • L. Craciun,
  • I. Ivan,
  • A. M. Badea,
  • R. Chidthong,
  • F. Mihai,
  • G. V. Aldica

摘要

In this study we present the effect of the irradiation of sintered MgB2 with protons of intermediate energies, from 8.6 to 15.07 MeV, at a constant fluence of 2.86 × 1016 p/cm2. We found clear evidence that the disorder generated by irradiation leads to a weak suppression of the critical temperature Tc and an increase of the critical current density Jc with increasing proton energy, as expected. However, it was found that thermomagnetic instabilities and vortex creep phenomena strongly depend on the ratio between proton range and the sample thickness. The number of the macroscopic flux jumps (MFJ) is highest and manifest up to 28 K in the sample with the proton range shorter than sample thickness (P1) and decrease as the proton energy increases. Similarly, the relaxation rate of the irreversible magnetization is the lowest in the sample P1 and increases with proton energy. We tentatively attribute this effect to the protons that stop within MgB2 and interact with the local structure/atomic composition.