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Pis'ma v Zh. Èksper. Teoret. Fiz., 2013, Volume 97, Issue 6, Pages 392–397 (Mi jetpl3383)  

This article is cited in 2 scientific papers (total in 2 papers)

CONDENSED MATTER

Suppression of superconductivity in YNi$_2$B$_2$C at the atomic disordering

A. E. Kar'kin, Yu. N. Akshentsev, B. N. Goshchitskii

Institute of Metal Physics, Ural Division of the Russian Academy of Sciences

Abstract: The behavior of the electrical resistivity $\rho(T)$, the superconducting transition temperature $T_c$, and the upper critical field $H_{c2}(T)$ of a polycrystalline sample of YNi$_2$B$_2$C irradiated by thermal neutrons with the subsequent high-temperature isochronous annealing in the temperature interval $T_{ann}=(100$–$1000) ^\circ$C has been studied. It has been found that the irradiation of YNi$_2$B$_2$C with a fluence of $10^{19} $cm$^{-2}$ leads to the suppression of the superconductivity. The final disordered state is reversible; i.e., the initial $\rho(T)$, $T_c$, and $H_{c2}(T)$ values are almost completely recovered upon annealing at up to $T_{ann}=1000 ^\circ$C. The quadratic dependence $\rho(T)=\rho_0 + a_2T^2$ is observed for the sample in the superconducting state ($T_c=(5.5$$14.5)$ K). The coefficient $a_2$ (proportional to the square of the electron mass $m^*$) hardly changes. The form of the dependence of $T_c$ on $\rho_0$ can be interpreted as the suppression of the two superconducting gaps, $\Delta_1$ and $\Delta_2$ $(\Delta_1\sim2\Delta_2)$. The degradation rate of $\Delta_1$ is about three times higher than that of $\Delta_2$. The dependences $dH_{c2}/dT$ on $\rho_0$ and $T_c$ may be described by the relations for a superconductor in the intermediate limit (the coherence length $\xi_0$ is on the order of the electron mean free path $l_{tr}$) under the assumption of a nearly constant electron density of states on the Fermi level $N(E_{F}$. The observed behavior of $T_c$ obviously does not agree with the widespread opinion about the purely electron-phonon mechanism of superconductivity in the compounds of this type supposing the anomalous type of superconducting pairing.

DOI: https://doi.org/10.7868/S0370274X13060118

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English version:
Journal of Experimental and Theoretical Physics Letters, 2013, 97:6, 347–351

Bibliographic databases:

Document Type: Article
Received: 01.02.2013
Revised: 12.02.2013

Citation: A. E. Kar'kin, Yu. N. Akshentsev, B. N. Goshchitskii, “Suppression of superconductivity in YNi$_2$B$_2$C at the atomic disordering”, Pis'ma v Zh. Èksper. Teoret. Fiz., 97:6 (2013), 392–397; JETP Letters, 97:6 (2013), 347–351

Citation in format AMSBIB
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\paper Suppression of superconductivity in YNi$_2$B$_2$C at the atomic disordering
\jour Pis'ma v Zh. \`Eksper. Teoret. Fiz.
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\vol 97
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\pages 392--397
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    This publication is cited in the following articles:
    1. Uzunok H.Y., Tutuncu H.M., Ozer S., Ugur S., Srivastava G.P., “Identification of Specific Phonon Contributions in Bcs-Type Superconductivity of Boride-Carbide Crystals With a Layer-Like Structure”, Solid State Commun., 206 (2015), 1–5  crossref  mathscinet  adsnasa  isi  elib  scopus
    2. T. Yamashita, T. Takenaka, Y. Tokiwa, J. A. Wilcox, Yu. Mizukami, D. Terazawa, Yu. Kasahara, Sh. Kittaka, T. Sakakibara, M. Konczykowski, S. Seiro, H. S. Jeevan, Ch. Geibel, C. Putzke, T. Onishi, H. Ikeda, A. Carrington, T. Shibauchi, Yu. Matsuda, “Fully gapped superconductivity with no sign change in the prototypical heavy-fermion CeCu2Si2”, Sci. Adv., 3:6 (2017), e1601667  crossref  isi  scopus
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