Superconducting properties of MgB$_2$ probed by radiation-induced disordering

A. E. Karkin; V. I. Voronin; T. V. Dyachkova; A. P. Tyutyunnik; V. G. Zubkov; Yu. G. Zainulin; B. N. Goshchitskii

Superconducting properties of MgB$_2$ probed by radiation-induced disordering

Superconductivity 2007-05-23 v2

Authors: A. E. Karkin , V. I. Voronin , T. V. Dyachkova , A. P. Tyutyunnik , V. G. Zubkov , Yu. G. Zainulin , B. N. Goshchitskii

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Abstract

The electrical resistivity $\rho$ and upper critical field $H_{c2}$ were measured in MgB $_2$ disordered by nuclear reactor neutrons. We found that superconducting temperature $T_c$ decreases under irradiation from 40 to 5 K. Despite strong disordering (more than 10 dpa (displacements per atom)), the initial crystal structure is preserved. The residual resistivity $\rho_0$ increases from 0.35 to 2 m $\Omega$ cm while $-dH_{c2}/dT$ remains approximately unchanged ( $-dH_{c2}/dT \approx 0.5$ T/K), and such behavior may be interpreted as decrease in the density of electronic states.

Keywords

superconductivity MgB2 radiation damage critical field resistivity

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@article{arxiv.cond-mat/0103344,
  title  = {Superconducting properties of MgB$_2$ probed by radiation-induced disordering},
  author = {A. E. Karkin and V. I. Voronin and T. V. Dyachkova and A. P. Tyutyunnik and V. G. Zubkov and Yu. G. Zainulin and B. N. Goshchitskii},
  journal= {arXiv preprint arXiv:cond-mat/0103344},
  year   = {2007}
}

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3 pages, 5 figures

Superconducting properties of MgB$_2$ probed by radiation-induced disordering

Abstract

Keywords

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