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Письма в Журнал экспериментальной и теоретической физики, 2011, том 93, выпуск 11, страницы 746–751
(Mi jetpl1922)
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Эта публикация цитируется в 21 научных статьях (всего в 21 статьях)
КОНДЕНСИРОВАННОЕ СОСТОЯНИЕ
Upper critical magnetic field in a Ba$_{0.68}$K$_{0.32}$Fe$_{2}$As$_{2}$ and Ba(Fe$_{0.93}$Co$_{0.07}$)$_{2}$As$_{2}$
V. A. Gasparova, L. Drigob, A. Audouardb, D. L. Sunc, C. T. Linc, S. L. Bud'kod, P. C. Canfieldd, F. Wolff-Fabrise, J. Wosnitzae a Institute of Solid State Physics, Russian Academy of Sciences
b Laboratoire National des Champs Magnetiques Pulses
c Max Planck Institute for Solid State Research
d Ames Laboratory, US DOE and Department of Physics and Astronomy, Iowa State University
e Helmholtz-Zentrum Dresden-Rossendorf
Аннотация:
We report measurements of the temperature dependence of the radio frequency magnetic penetration depth in Ba$_{0.68}$K$_{0.32}$Fe$_{2}$As$_{2}$ and Ba(Fe$_{0.93}$Co$_{0.07}$)$_{2}$As$_{2}$ single crystals in pulsed magnetic fields up to 60 T. From our data, we construct an $H$–$T$-phase diagram for the inter-plane ($H\parallel {c}$) and in-plane ($H\parallel {ab}$) directions for both compounds. For both field orientations in Ba$_{0.68}$K$_{0.32}$Fe$_{2}$As$_{2}$ we find a concave curvature of the $H_{c2}(T)$ lines with decreasing anisotropy and saturation towards lower temperature. Taking into account Pauli spin paramagnetism we can describe $H_{c2}(T)$ and its anisotropy. In contrast, we find that Pauli paramagnetic pair breaking is not essential for Ba(Fe$_{0.93}$Co$_{0.07}$)$_{2}$As$_{2}$. For this electron-doped compound, the data support a $H_{c2}(T)$ dependence that can be described by the Werthamer–Helfand–Hohenberg model for $H\parallel{ab}$ and a two-gap behavior for $H\parallel {c}$.
Поступила в редакцию: 28.04.2011
Образец цитирования:
V. A. Gasparov, L. Drigo, A. Audouard, D. L. Sun, C. T. Lin, S. L. Bud'ko, P. C. Canfield, F. Wolff-Fabris, J. Wosnitza, “Upper critical magnetic field in a Ba$_{0.68}$K$_{0.32}$Fe$_{2}$As$_{2}$ and Ba(Fe$_{0.93}$Co$_{0.07}$)$_{2}$As$_{2}$”, Письма в ЖЭТФ, 93:11 (2011), 746–751; JETP Letters, 93:11 (2011), 667–672
Образцы ссылок на эту страницу:
https://www.mathnet.ru/rus/jetpl1922 https://www.mathnet.ru/rus/jetpl/v93/i11/p746
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