Superconducting order parameters in overdoped 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>BaFe</mml:mi><mml:mrow><mml:mn>1.86</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>Ni</mml:mi><mml:mrow><mml:mn>0.14</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>As</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>
 revealed by multiple Andreev reflection spectroscopy of planar break junctions

Kuzmicheva, T. E.; Kuzmichev, S. A.; Pervakov, K. S.; Власенко, В. А.

doi:10.1103/physrevb.104.174512

Cited by 5 publications

(2 citation statements)

References 78 publications

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“…Moreover, the relative width of the doublet remains almost constant with temperature (see the inset of Figure 9b), providing ∆ in L (T)/∆ out L (T) ≈ const. This behavior resembles the temperature evolution of similar dynamic conductance doublets reproducibly observed by us earlier in sister LiFeAs compound [51], as well as BaFe 2−x Ni x As pnictides [52]. Generally, in a multiple-gap SC, the ∆ 1 (T)/∆ 2 (T) ≈ const behavior takes place in the only case of det(λ ij ) = 0, yielding β = 1.…”

Section: Discussionsupporting

confidence: 86%

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Upper Critical Field and Tunneling Spectroscopy of Underdoped Na(Fe,Co)As Single Crystals

Morgun,

Kuzmichev,

Morozov

et al. 2023

Materials

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A comprehensive study of superconducting properties of underdoped NaFe0.979Co0.021As single crystals by a combination of upper critical field measurements and incoherent multiple Andreev reflection effect (IMARE) spectroscopy is presented. The Hc2(T) temperature dependences are measured at magnetic fields up to 16 T with in-plane and out-of-plane field directions and considered within single-band and two-band models in order to estimate the Hc2(0) value. In IMARE spectroscopy probes, the magnitude, characteristic ratio, and temperature dependence of the superconducting order parameters (ΔL,S(T)) are determined locally and directly. A possible k-space anisotropy of the large superconducting gap is demonstrated. We show that usage of a quadruple of λij0 coupling constants obtained in the IMARE experiment can significantly reduce the number of free parameters required to fit the Hc2(T) dependence within a two-band approach (from six to two).

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Section: Discussionsupporting

confidence: 86%

“…As a result, the area (determining the normal resistance (R N )) of the junction rather than the distance between the SC clefts (and therefore the barrier strength (Z)) is the adjustable parameter in our experimental setup. According to our estimates, the typical size of the MCPBJ contact is about 10-50 nm along the ab plane [51,52].…”

Section: Discussionmentioning

confidence: 74%

Upper Critical Field and Tunneling Spectroscopy of Underdoped Na(Fe,Co)As Single Crystals

Morgun,

Kuzmichev,

Morozov

et al. 2023

Materials

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Temperature Dependence of the Superconducting Order Parameter in Stoichiometric Alkali Metal-Based Pnictide EuCsFe$$_4$$As$$_4$$

Kuzmicheva,

Pervakov,

Vlasenko

et al. 2024

J Supercond Nov Magn

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Multiple Andreev reflections effect spectroscopy of LiFeAs single crystals: three superconducting order parameters and their temperature evolution

et al. 2022

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The structure of the superconducting order parameter of LiFeAs is studied by incoherent multiple Andreev reflections effect (IMARE) spectroscopy. The high transparent superconductor–thin normal metal–superconductor (SnS) contacts are created by a planar “break-junction” technique. Below $$T_c \approx 17.5$$ T c ≈ 17.5 K, the obtained I(V) and dI(V)/dV characteristics of SnS junctions show a presence of at least three bulk superconducting order parameters in LiFeAs. We directly determine the magnitudes, characteristic ratios, and temperature dependences of the superconducting gaps and discuss their symmetry.

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Superconducting order parameters in overdoped BaFe1.86Ni0.14As2 revealed by multiple Andreev reflection spectroscopy of planar break junctions

Cited by 5 publications

References 78 publications

Upper Critical Field and Tunneling Spectroscopy of Underdoped Na(Fe,Co)As Single Crystals

Upper Critical Field and Tunneling Spectroscopy of Underdoped Na(Fe,Co)As Single Crystals

Temperature Dependence of the Superconducting Order Parameter in Stoichiometric Alkali Metal-Based Pnictide EuCsFe$$_4$$As$$_4$$

Multiple Andreev reflections effect spectroscopy of LiFeAs single crystals: three superconducting order parameters and their temperature evolution

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