Upper critical field and irreversibility line in superconducting MgB_2

Details Upper critical field and irreversibility line in superconducting MgB_2 Upper critical field and irreversibility line in superconducting MgB_2

2001-04-05

arxiv.org/abs/cond-mat/0104088v1

Solid State Commun. 118 (2001) 497.

Physics

Condensed Matter

Superconductivity

8 pages with 5 figures, submitted to Solid State Communications

Scientific paper

10.1016/S0038-1098(01)00157-0

The upper critical field Hc2(T) of sintered pellets of the recently discovered MgB_2 superconductor was investigated by transport, ac susceptibility and dc magnetization measurements in magnetic fields up to 16 T covering a temperature range between Tc ~ 39 K and T = 3 K ~ 0.1Tc. The temperature dependence of the upper critical field, Hc2(T), shows a positive curvature near Tc similar to that found for the borocarbides YNi_2B_2C and LuNi_2B_2C indicating that MgB_2 is in the clean limit. The irreversibility line was consistently determined from dc magnetization measurements and from the imaginary component of ac susceptibility. The irreversibility field was found to increase up to 8.5 T at 10 K.

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