非磁性化学计量钙钾铁四砷化物的多重间隙超导性

IF 1.4 4区物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY JETP Letters Pub Date : 2024-05-13 DOI:10.1134/s0021364024601313

T. E. Kuzmicheva, S. A. Kuzmichev, A. S. Medvedev

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引用次数: 0

摘要

利用平面断口的非相干多重安德列夫反射效应光谱，我们研究了CaKFe4As4 pnictides（1144家族）的超导间隙结构。我们已经证明了三种体超导阶参数Δi的共存，并直接测定了它们的大小和相应的特征比2Δi(0)/kBTc ≈ 5.6, 3.9, 和 1.3 at T\( \ll \) Tc。我们比较了 CaKFe4As4 与我们早先研究的 1144 和 122 系列姊妹锑化物的间隙结构。

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Mutliple-gap Superconductivity of Nonmagnetic Stoichiometric CaKFe4As4 Pnictide

Using incoherent multiple Andreev reflection effect spectroscopy of planar break-junctions, we have studied the superconducting gap structure of CaKFe₄As₄ pnictides (the 1144 family), those turning to the superconducting state in the stoichiometric composition with critical temperature T_c ≈ 36.1K.We have shown a coexistence of three bulk superconducting order parameters Δ_i, and directly determined their magnitudes and corresponding characteristic ratios 2Δ_i(0)/k_BT_c ≈ 5.6, 3.9, and 1.3 at T \( \ll \) T_c. We compare the gap structure of CaKFe₄As₄ and sister pnictides of the 1144 and 122 families studied by us earlier.

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来源期刊

JETP Letters 物理-物理：综合

CiteScore

2.40

自引率

30.80%

发文量

164

审稿时长

3-6 weeks

期刊介绍： All topics of experimental and theoretical physics including gravitation, field theory, elementary particles and nuclei, plasma, nonlinear phenomena, condensed matter, superconductivity, superfluidity, lasers, and surfaces.