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Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki, 2002, Volume 75, Issue 3, Pages 166–174 (Mi jetpl3154)  

CONDENSED MATTER

Anomalous transport properties of a paramagnetic NiTiO$_3$ + HTSC two-phase system representing a random Josephson junction network

M. I. Petrov, D. A. Balaev, K. A. Shaykhutdinov, S. I. Popkov

L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk
References:
Abstract: Composites representing a network of random Josephson junctions and characterized by the compositions 92.5 at.% ${\rm Y_{3/4}Lu_{1/4}Ba_2Cu_3O_7+7.5}$ at.% NiTiO$_3$ and 92.5 at.% ${\rm Y_{3/4}Lu_{1/4}Ba_2Cu_3O_7+7.5}$ at.% MgTiO$_3$ are synthesized, and their magnetoresistance properties are studied. The temperature dependence of the resistance $R(T)$ measured for the composite that contains the paramagnetic NiTiO$_3$ compound exhibits a characteristic feature below the superconducting transition temperature $T_c$ of the high-$T_c$ superconductor, namely, a region where $R$ is independent of the current $j$ and weakly depends on the magnetic field $H$. Below a certain temperature $T_m$, a strong dependence of $R$ on $j$ and $H$ is observed, which is peculiar to a network of Josephson junctions. The dependences $R(T, j, H)$ obtained for the «reference» samples with the nonmagnetic MgTiO$_3$ compound exhibit no such features. The anomalous behavior of the HTSC + NiTiO$_3$ composite is explained by the effect produced by the magnetic moments of Ni atoms in the insulating barriers on the transport current.
Received: 12.10.2001
Revised: 26.12.2001
English version:
Journal of Experimental and Theoretical Physics Letters, 2002, Volume 75, Issue 3, Pages 138–141
DOI: https://doi.org/10.1134/1.1469500
Bibliographic databases:
Document Type: Article
PACS: 74.50.+r, 74.80.Dm
Language: Russian
Citation: M. I. Petrov, D. A. Balaev, K. A. Shaykhutdinov, S. I. Popkov, “Anomalous transport properties of a paramagnetic NiTiO$_3$ + HTSC two-phase system representing a random Josephson junction network”, Pis'ma v Zh. Èksper. Teoret. Fiz., 75:3 (2002), 166–174; JETP Letters, 75:3 (2002), 138–141
Citation in format AMSBIB
\Bibitem{PetBalSha02}
\by M.~I.~Petrov, D.~A.~Balaev, K.~A.~Shaykhutdinov, S.~I.~Popkov
\paper Anomalous transport properties of a paramagnetic NiTiO$_3$ + HTSC two-phase system representing a random Josephson junction network
\jour Pis'ma v Zh. \`Eksper. Teoret. Fiz.
\yr 2002
\vol 75
\issue 3
\pages 166--174
\mathnet{http://mi.mathnet.ru/jetpl3154}
\transl
\jour JETP Letters
\yr 2002
\vol 75
\issue 3
\pages 138--141
\crossref{https://doi.org/10.1134/1.1469500}
\scopus{https://www.scopus.com/record/display.url?origin=inward&eid=2-s2.0-0038892189}
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