1 / 1

Correlated Enhancement of Hc 2 and Jc in Carbon Nanotube Doped MgB 2

B a r I l o c h e. Correlated Enhancement of Hc 2 and Jc in Carbon Nanotube Doped MgB 2.

carnig
Download Presentation

Correlated Enhancement of Hc 2 and Jc in Carbon Nanotube Doped MgB 2

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. B a r I l o c h e Correlated Enhancement of Hc2 and Jc in Carbon Nanotube Doped MgB2 A. Serquis et al. achieved the enhancement of current-carrying performance and critical magnetic field simultaneously in polycrystalline MgB2 by doping it with double-wall carbon nanotube. The optimum content, from the point of view of the critical current density Jc, is in the range 2.5-10 at.% depending on field and temperature. Record values of the upper critical field, Hc2(4 K) = 41.9 T (Hc2(0)  44.4 T), were reached by Serquis et al. in a bulk sample with 10 at.% nominal content. The results are successfully described using a theoretical model for a two-gap superconductor in the dirty limit first proposed by Gurevich (A.Gurevich et al., Supercond. Sci. Technol. 17, 278 (2004)). . B: Hc2 versus reduced temperature t for CNT00, CNT01 and CNT10 samples and the fit to data using the expresion proposed by Gurevich et al. Inset: A typical TEM image of a DWCNT with a 3 nm diameter is displayed in the lower inset (arrows indicate the walls of the double wall nanotube) . A: Jc vs magnetic field determined from magnetization measurements for samples CNT00 (MgB2 pure), CNT25 (2.5% doping), CNT10 (10% doping) and CNT125 (12.5 % doping), at T = 5 K (solid symbols) and 20 K (open symbols). The inset illustrates Jc as function of x at m0H = 4 T . A. Serquis. G. Serrano, S.M. Moreno, L. Civale, B. Maiorov, F. Balakirev and M. Jaime Superconductor Science & Technology 20, L12 (2007).

More Related