Superconducting critical fields and anisotropy of a MgB2 single crystalстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Using a double axis vibrating sample magnetometer, we have made detailed magnetic measurements of the lower critical field H-c1 for fields parallel to the two crystallographic directions of MgB2, single crystals. Additionally, using a novel Hall probe magnetometer we have measured high precision magnetization loops, from which we directly determine the Lipper critical field H-c1 for both field orientations. Our results suggest that H-c2 is much larger than most previous estimates and that consequently the Ginzburg-Landau parameter kappa is very low (less than 5). We find the anisotropy parameter gamma similar to 2, independent of temperature over the measured range.