Magnetic transitions and electrical transport in Bi-doped lanthanum strontium manganites
Vernadsky National Library of Ukraine
Переглянути архів Інформація| Поле | Співвідношення | |
| Title |
Magnetic transitions and electrical transport in Bi-doped lanthanum strontium manganites
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| Creator |
Ahmed, A.M.
Mohamed, H.F. Šoka, M. |
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| Subject |
Низкотемпеpатуpный магнетизм
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| Description |
The temperature dependence of the electrical resistivity ρ, thermoelectric power S and the magnetic susceptibility χ of La₀.₇–xBixSr₀.₃MnO₃ (x = 0.05, 0.10, and 0.15 at.%) manganites were investigated. La₀.₇–xBixSr₀.₃MnO₃ crystallizes in a single phase rhombohedral structure with parasitic phase inclusions. With increasing Bi concentration, a systematic decrease in the ferromagnetic transition temperature (TC), the metal–semiconducting transition temperature (Tms1) and also the values of activation energies Eρ and ES from ρ(T) and S(T) were observed. On the other hand, in the high-temperature (T > Tms) paramagnetic semiconductor regime, the adiabatic small polaron hopping model fit well, thereby indicating that polaron hopping might be responsible for the conduction mechanism. In addition, the thermoelectric power data at low temperatures were analyzed by considering both the magnon and the phonon drag concept, while the high-temperature data were confirmed a small polaron hopping conduction mechanism.
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| Date |
2017-06-07T05:45:30Z
2017-06-07T05:45:30Z 2014 |
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| Type |
Article
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| Identifier |
Magnetic transitions and electrical transport in Bi-doped lanthanum strontium manganites / A.M. Ahmed, H.F. Mohamed, M. Šoka // Физика низких температур. — 2014. — Т. 40, № 5. — С. 539-544. — Бібліогр.: 32 назв. — англ.
0132-6414 PACS 71.27.+a, 75.30.Hx, 75.50.Ee http://dspace.nbuv.gov.ua/handle/123456789/119498 |
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| Language |
en
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| Relation |
Физика низких температур
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| Publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
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