Hopping conductivity of La1-xSrxMN 1-yFeyO3

Zakhvalinskii Vasilii; Laiho Reino; Lashkul Alexander V.; Lisunov Konstantin; Lähderanta Erkki; Nekrasova Yulia; Petrenko Peter A.

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ZAKHVALINSKII, Vasilii, LAIHO, Reino, LASHKUL, Alexander V., LISUNOV, Konstantin, LÄHDERANTA, Erkki, NEKRASOVA, Yulia, PETRENKO, Peter A.. Hopping conductivity of La1-xSrxMN 1-yFeyO3. In: Journal of Physics: Conference Series, Ed. 1, 23-28 august 2010, Krakow. Cambridge: Institute of Physics, 2011, Ediția 1, Vol. 303, pp. 1-7. ISSN 1742-6588; E-ISSN:1742-6596. DOI: https://doi.org/10.1088/1742-6596/303/1/012066

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Journal of Physics: Conference Series
Ediția 1, Vol. 303, 2011

Conferința "Joint European Magnetic Symposia"
1, Krakow, Polonia, 23-28 august 2010

Hopping conductivity of La1-xSrxMN 1-yFeyO3

DOI:https://doi.org/10.1088/1742-6596/303/1/012066

Pag. 1-7

Zakhvalinskii Vasilii¹², Laiho Reino³, Lashkul Alexander V.¹, Lisunov Konstantin¹⁴, Lähderanta Erkki¹, Nekrasova Yulia², Petrenko Peter A.⁴

¹ Lappeenranta University of Technology,
² Belgorod State University,
³ Wihuri Physical Laboratory, University of Turku,
⁴ Institute of Applied Physics, Academy of Sciences of Moldova

Disponibil în IBN: 2 iulie 2024

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The resistivity, ρ, is investigated in ceramic La_1-xSr _xMn_1-yFe_yO₃ samples with x = 0.3 and y = 0.03 - 0.25 at temperatures T ∼ 5 - 310 K in magnetic fields B up to 8 T. The metallic conductivity at y = 0.03 and the variable-range hopping (VRH) conductivity between y = 0.15 - 0.25 are observed. The Mott VRH conductivity takes place in all investigated samples with y ≥ 0.15 in different temperature intervals. In addition, at y = 0.25 the interval of the Shklovskii-Efros VRH conductivity, characteristic of the Coulomb gap in the density of the localized states (DOS), is observed. Analysis of the VRH conductivity yields the values of the microscopic parameters, including the DOS features and the localization radii of charge carriers.

Cuvinte-cheie
Coulomb gaps, Hopping conductivity, Localized state, Metallic conductivity, Microscopic parameter, Temperature intervals, Variable-range hopping, VRH conductivity

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<subject>Hopping conductivity</subject>
<subject>Localized state</subject>
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<description xml:lang='en' descriptionType='Abstract'><p>The resistivity, &rho;, is investigated in ceramic La<sub>1-x</sub>Sr&nbsp;<sub>x</sub>Mn<sub>1-y</sub>Fe<sub>y</sub>O<sub>3</sub>&nbsp;samples with x = 0.3 and y = 0.03 - 0.25 at temperatures T &sim; 5 - 310 K in magnetic fields B up to 8 T. The metallic conductivity at y = 0.03 and the variable-range hopping (VRH) conductivity between y = 0.15 - 0.25 are observed. The Mott VRH conductivity takes place in all investigated samples with y &ge; 0.15 in different temperature intervals. In addition, at y = 0.25 the interval of the Shklovskii-Efros VRH conductivity, characteristic of the Coulomb gap in the density of the localized states (DOS), is observed. Analysis of the VRH conductivity yields the values of the microscopic parameters, including the DOS features and the localization radii of charge carriers.</p></description>
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