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Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki, 2024, Volume 119, Issue 12, Pages 909–916
DOI: https://doi.org/10.31857/S1234567824120073 (Mi jetpl7255) 		 
CONDENSED MATTER

Localized superconductivity in LaB$_6$ hexaboride with dynamic charge stripes

A. N. Azarevicha, A. V. Bogacha, O. N. Khrykinaab, N. B. Bolotinab, V. M. Gridchinab, N. Yu. Shitsevalovac, S. Yu. Gavrilkind, A. Yu. Tsvetkovd, S. Gabanie, K. Flachbarte, A. V. Kuznetsovf, N. E. Sluchankoa

a Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow, 119991 Russia
b National Research Center Kurchatov Institute, Moscow, 123182 Russia
c Frantsevich Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, Kyiv, 03680 Ukraine
d Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991 Russia
e Institute of Experimental Physics, Slovak Academy of Sciences, Košice, SK-04001 Slovakia
f National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Moscow, 115409 Russia
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DOI: https://doi.org/10.31857/S1234567824120073
Abstract: Type II superconductivity with $T_c\sim6\,$K is discovered in LaB$_6$. The critical fields are determined and the estimates for the coherence length $\xi(0)\sim240\,$Å, the Ginzburg–Landau parameter $\kappa_{\text{GL}}\sim2$, and the electron–phonon coupling constant $\lambda_{e{-}ph}\approx 0.75$ are obtained. Precision X-ray diffraction studies at $T = 30$ K reveal three-dimensional charge-stripe structures in LaB$_6$. The scenario of superconductivity localized near filamentary channels with a fluctuating electron density arising in the lanthanum hexaboride matrix is discussed.
Funding agency Grant number
Russian Science Foundation 23-22-00297
Ministry of Science and Higher Education of the Russian Federation
This work was supported by the Russian Science Foundation (project no. 23-22-00297). N.B. Bolotina and V.M.В Gridchina acknowledge the support of the structural analysis by the Ministry of the Science and Higher Education of the Russian Federation (state assignment for the National Research Center Kurchatov Institute). The preliminary measurements of LaB$_6$ crystals were supported by the European Microkelvin Platform (EMP).
Received: 27.04.2024
Revised: 07.05.2024
Accepted: 13.05.2024
English version:
Journal of Experimental and Theoretical Physics Letters, 2024, Volume 119, Issue 12, Pages 934–941
DOI: https://doi.org/10.1134/S0021364024601696
Bibliographic databases:
Document Type: Article
Language: Russian
Citation: A. N. Azarevich, A. V. Bogach, O. N. Khrykina, N. B. Bolotina, V. M. Gridchina, N. Yu. Shitsevalova, S. Yu. Gavrilkin, A. Yu. Tsvetkov, S. Gabani, K. Flachbart, A. V. Kuznetsov, N. E. Sluchanko, “Localized superconductivity in LaB$_6$ hexaboride with dynamic charge stripes”, Pis'ma v Zh. Èksper. Teoret. Fiz., 119:12 (2024), 909–916; JETP Letters, 119:12 (2024), 934–941
Citation in format AMSBIB
\Bibitem{AzaBogKhr24}
\by A.~N.~Azarevich, A.~V.~Bogach, O.~N.~Khrykina, N.~B.~Bolotina, V.~M.~Gridchina, N.~Yu.~Shitsevalova, S.~Yu.~Gavrilkin, A.~Yu.~Tsvetkov, S.~Gabani, K.~Flachbart, A.~V.~Kuznetsov, N.~E.~Sluchanko
\paper Localized superconductivity in LaB$_6$ hexaboride with dynamic charge stripes
\jour Pis'ma v Zh. \`Eksper. Teoret. Fiz.
\yr 2024
\vol 119
\issue 12
\pages 909--916
\mathnet{http://mi.mathnet.ru/jetpl7255}
\crossref{https://doi.org/10.31857/S1234567824120073}
\edn{https://elibrary.ru/RMYYCI}
\transl
\jour JETP Letters
\yr 2024
\vol 119
\issue 12
\pages 934--941
\crossref{https://doi.org/10.1134/S0021364024601696}
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