تقرير
Determination of anisotropic Hc2 up to 60 T in (Ba0.55K0.45)Fe2As2 single crystals
| العنوان: | Determination of anisotropic Hc2 up to 60 T in (Ba0.55K0.45)Fe2As2 single crystals |
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| المؤلفون: | Altarawneh, M., Collar, K., Mielke, C. H., Ni, N., Bud'ko, S. L., Canfield, P. C. |
| المصدر: | PRB 78, 220505 (2008) |
| سنة النشر: | 2008 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Superconductivity |
| الوصف: | The radio frequency penetration depth was measured in the superconductor (Ba$_{0.55}$K$_{0.45}$)Fe$_{2}$As$_{2}$ under pulsed magnetic fields extending to 60 tesla and down to 14 K. Using these data we are able to infer a $H_{c2}(T)$, $H-T$ phase diagram, for applied fields parallel and perpendicular to the crystallographic c-axis. The upper critical field curvature is different for the respective orientations but they each remain positive down to 14 K. The upper critical field anisotropy is moderate, $\approx 3.5$ close to $T_c$, and drops with the decrease of temperature, reaching $\approx 1.2$ at $14 K$. These data and analysis indicate that (i) (Ba$_{0.55}$K$_{0.45}$)Fe$_{2}$As$_{2}$ anisotropy diminishes with temperature and has an unusual temperature dependence, (ii) $H_{c2} (T=0)$ for this compound may easily approach fields of 75 tesla. Comment: published version |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevB.78.220505 |
| URL الوصول: | http://arxiv.org/abs/0807.4488 |
| رقم الأكسشن: | edsarx.0807.4488 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevB.78.220505 |
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