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Pis'ma v Zh. Èksper. Teoret. Fiz., 2011, Volume 93, Issue 11, Pages 746–751 (Mi jetpl1922)  

This article is cited in 18 scientific papers (total in 18 papers)

CONDENSED MATTER

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

Abstract: 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 $H\parallel {c}$.

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English version:
Journal of Experimental and Theoretical Physics Letters, 2011, 93:11, 667–672

Bibliographic databases:

Document Type: Article
Received: 28.04.2011
Language: English

Citation: 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$_{2}$”, Pis'ma v Zh. Èksper. Teoret. Fiz., 93:11 (2011), 746–751; JETP Letters, 93:11 (2011), 667–672

Citation in format AMSBIB
\Bibitem{GasDriAud11}
\by 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
\paper 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$_{2}$
\jour Pis'ma v Zh. \`Eksper. Teoret. Fiz.
\yr 2011
\vol 93
\issue 11
\pages 746--751
\mathnet{http://mi.mathnet.ru/jetpl1922}
\transl
\jour JETP Letters
\yr 2011
\vol 93
\issue 11
\pages 667--672
\crossref{https://doi.org/10.1134/S0021364011110038}
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\scopus{http://www.scopus.com/record/display.url?origin=inward&eid=2-s2.0-79961076715}


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