par Zhang, Ying 
;Deltour, Robert ;Wen, Haihu;Zhao, Zhongxian
Référence Physica. C, Superconductivity, 388-389, page (173-174)
Publication Publié, 2003-05
;Deltour, Robert ;Wen, Haihu;Zhao, ZhongxianRéférence Physica. C, Superconductivity, 388-389, page (173-174)
Publication Publié, 2003-05
Article révisé par les pairs
| Résumé : | Irreversibility lines and magnetic relaxation of MgB2 are studied. The large separation between irreversibility line and upper critical magnetic field for T → 0 is explained by quantum fluctuations of vortices. Theoretical fits are in good agreement with experimental data. Magnetic relaxation rates of MgB2 are studied. A quantum correction of the relaxation rate is proposed, leading to a simple evaluation of the energy barrier: U0(T,H) ∼ Uth(T)UH(H) ∝ (1 - T/Tc)α(μ0H)β with α ∼ 1.5 and β ∼ -2.0. © 2003 Elsevier Science B.V. All rights reserved. |
