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Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki, 2001, Volume 73, Issue 10, Pages 640–642
(Mi jetpl4409)
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This article is cited in 31 scientific papers (total in 31 papers)
CONDENSED MATTER
Superconducting properties of the atomically disordered MgB$_2$ compound
A. E. Kar'kina, V. I. Voronina, T. V. D'yachkovab, N. I. Kadyrovab, A. P. Tyutyunikb, V. G. Zubkovb, Yu. G. Zainulinb, M. V. Sadovskiic, B. N. Goshchitskiia a Institute of Metal Physics, Ural Division of the Russian Academy of Sciences, Ekaterinburg
b Institute of Solid State Chemistry, Urals Branch of the Russian Academy of Sciences, Ekaterinburg
c Institute of Electrophysics, Ural Branch, Russian Academy of Sciences, Ekaterinburg
Abstract:
The effect of disorder induced by neutron irradiation in a nuclear reactor (thermal neutron fluence $1\times10^{19}\,$cm$^{-2}$) on the superconducting transition temperature $T_c$ and the upper critical field $H_{c^2}$ of polycrystalline MgB$_2$ samples was investigated. Despite the appreciable radiation-induced distortions (more than ten displacements per atom), the initial crystal structure (C32) was retained. The temperature $T_c$ decreased from $38$ to $5$ K upon irradiation and was practically completely restored after the subsequent annealing at a temperature of $700^\circ$C. A weak change in the $dH_{c^2}/dT$ derivative upon irradiation is explained by the fact that the irradiated samples are described by the «pure» limit of the theory of disordered superconductors. The suppression of $T_c$ upon disordering may be due to the isotropization of the originally anisotropic (or multicomponent) superconducting gap or to a decrease in the density of electronic states at the Fermi level.
Received: 23.04.2001
Citation:
A. E. Kar'kin, V. I. Voronin, T. V. D'yachkova, N. I. Kadyrova, A. P. Tyutyunik, V. G. Zubkov, Yu. G. Zainulin, M. V. Sadovskii, B. N. Goshchitskii, “Superconducting properties of the atomically disordered MgB$_2$ compound”, Pis'ma v Zh. Èksper. Teoret. Fiz., 73:10 (2001), 640–642; JETP Letters, 73:10 (2001), 570–572
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