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This article is cited in 3 scientific papers (total in 3 papers)
CONDENSED MATTER
Structure and anisotropy of the superconducting order parameter in Ba$_{0.65}$K$_{0.35}$Fe$_2$As$_2$ probed by Andreev spectroscopy
T. E. Kuzmichevaa, S. A. Kuzmichevab, A. A. Kordyukc, V. M. Pudalovad a Lebedev Physical Institute, Russian Academy of Sciences, Moscow, Russia
b Moscow State University, Moscow, Russia
c Kurdyumov Institute for Metal Physics, National Academy of Sciences of Ukraine, Kyiv, Ukraine
d National Research University Higher School of Economics, Moscow, Russia
Abstract:
The superconducting order parameters in optimally doped Ba$_{0.65}$K$_{0.35}$Fe$_2$As$_2$ single crystals have been directly measured using multiple Andreev reflection effect spectroscopy of superconductor–normal metal–superconductor break-junctions. We determine two superconducting gaps, which are nodeless in the $k_xk_y$-plane of the momentum space, and resolve a substantial in-plane anisotropy of the large gap. The temperature dependences of the gaps indicate a strong coupling within the bands where $\Delta_{\mathrm{L}}$ develops, a weak coupling in the condensate with the small gap $\Delta_S$, and a moderate interband interaction between the two condensates. The own critical temperatures of both condensates have been estimated (under the hypotherical assumption of zero interband interaction).
Received: 02.11.2017 Revised: 16.11.2017
Citation:
T. E. Kuzmicheva, S. A. Kuzmichev, A. A. Kordyuk, V. M. Pudalov, “Structure and anisotropy of the superconducting order parameter in Ba$_{0.65}$K$_{0.35}$Fe$_2$As$_2$ probed by Andreev spectroscopy”, Pis'ma v Zh. Èksper. Teoret. Fiz., 107:1 (2018), 47–53; JETP Letters, 107:1 (2018), 42–47
Linking options:
https://www.mathnet.ru/eng/jetpl5465 https://www.mathnet.ru/eng/jetpl/v107/i1/p47
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Abstract page: | 246 | Full-text PDF : | 32 | References: | 29 | First page: | 5 |
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