Doping evolution of the anisotropic upper critical fields in the iron-based superconductor Ba1−xKxFe2As2
| Autor: | Thomas A. Lograsso, Makariy A. Tanatar, Jan Jaroszynski, Yong Liu, Ruslan Prozorov, James S. Brooks |
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| Rok vydání: | 2017 |
| Předmět: |
Physics
Superconductivity Condensed matter physics Magnetism 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Orientation (vector space) Paramagnetism Iron-based superconductor Electrical resistivity and conductivity 0103 physical sciences 010306 general physics 0210 nano-technology Anisotropy Critical field |
| Zdroj: | Physical Review B. 96 |
| ISSN: | 2469-9969 2469-9950 |
| Popis: | In-plane resistivity measurements as a function of temperature and magnetic field up to 35 T with precise orientation within the crystallographic $ac$ plane were used to study the upper critical field ${H}_{c2}$ of the hole-doped iron-based superconductor ${\mathrm{Ba}}_{1\ensuremath{-}x}{\mathrm{K}}_{x}{\mathrm{Fe}}_{2}{\mathrm{As}}_{2}$. Compositions of the samples studied spanned from under- doped $x=0.17$ $({T}_{c}=12$ K) and $x=0.22$ $({T}_{c}=20$ K), both in the coexistence range of stripe magnetism and superconductivity, through optimal doping $x=0.39$ $({T}_{c}=38.4$ K) and $x=0.47$ $({T}_{c}=37.2$ K), to overdoped $x=0.65$ $({T}_{c}=22$ K) and $x=0.83$ $({T}_{c}=10$ K). We find notable doping asymmetry of the shapes of the anisotropic ${H}_{c2}(T)$, suggesting the important role of paramagnetic limiting effects in the $H\ensuremath{\parallel}a$ configuration in overdoped compositions and multiband effects in underdoped compositions. |
| Databáze: | OpenAIRE |
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