کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8001383 | 1516284 | 2014 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Electric field gradient wave (EFGW) in iron-based superconductor Ba0.6K0.4Fe2As2 studied by Mössbauer spectroscopy
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Electric field gradient wave (EFGW) in iron-based superconductor Ba0.6K0.4Fe2As2 studied by Mössbauer spectroscopy Electric field gradient wave (EFGW) in iron-based superconductor Ba0.6K0.4Fe2As2 studied by Mössbauer spectroscopy](/preview/png/8001383.png)
چکیده انگلیسی
The optimally doped '122' iron-based superconductor Ba0.6K0.4Fe2As2 has been studied by 57Fe Mössbauer spectroscopy versus temperature ranging from 4.2Â K till 300Â K with particular attention paid to the superconducting transition around 38Â K. The spectra do not contain magnetic components and they exhibit quasi-continuous distribution of quadrupole split doublets. A distribution follows the electric field gradient (EFG) spatial modulation (wave) - EFGW. The EFGW is accompanied by some charge density wave (CDW) having about an order of magnitude lesser influence on the spectrum. The EFGW could be modeled as widely separated narrow sheets with the EFG increasing from small till maximum value almost linearly and subsequently dropping back to the original value in a similar fashion - across the sheet. One encounters very small and almost constant EFG between sheets. The EFGW shape and amplitude as well as the amplitude of CDW are strongly affected by a superconducting transition. All modulations are damped significantly at transition (38Â K) and recover at a temperature being about 14Â K lower. The maximum quadrupole splitting at 4.2Â K amounts to about 2.1Â mm/s, while the dispersion of CDW seen on the iron nuclei could be estimated far away from the superconducting gap opening and at low temperature as 0.5Â el./a.u.3. It drops to about 0.3Â el./a.u.3 just below transition to the superconducting state.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 609, 5 October 2014, Pages 150-155
Journal: Journal of Alloys and Compounds - Volume 609, 5 October 2014, Pages 150-155
نویسندگان
A.K. Jasek, K. KomÄdera, A. BÅachowski, K. Ruebenbauer, Z. Bukowski, J.G. Storey, J. Karpinski,