Superconducting Properties of Atomic-Disordered Compound MgCNi_3

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The effect of radiation-induced disordering in a nuclear reactor (fast neutrons fluence Φ= 5\cdot10^{19} cm^2, T_{\text{irr}} = 340 K) on resistivity ρ, superconducting transition temperature T_C and upper critical field H_{C_2} of polycrystalline MgCNi_3 samples was investigated. It was found that T_C decreases under irradiation from 6.5 to 2.9 K and completely recovers after annealing at 600 ^\circC. Temperature dependences ρ(T) are characteristic of compounds with strong electron-phonon interaction. The dH_{C_2}/dT behaviour testifies to a considerable decrease in density of electronic state at Fermi level N(E_F) in the course of disordering.
4 pages, latex, 4 figures

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Superconductivity

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http://salesiana.dossiersoluciones.com/handle/123456789/20006

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0209575
 http://arxiv.org/abs/cond-mat/0209575

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arXiv