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періодичних видань НАН України
періодичних видань НАН України
Effect of Ca(Ce) doping on thermopower of LaMnO₃ manganites
Репозиторій DSpace/Manakin
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Effect of Ca(Ce) doping on thermopower of LaMnO₃ manganites
Тема:
Наноструктуры при низких температурах
Інший ID:
PACS: 73.50.Lw, 74.25.Kc, 75.47.Gk, 75.47.Lx
Посилання:
Effect of Ca(Ce) doping on thermopower of LaMnO₃ manganites / D. Varshney, I. Mansuri, A. Yogi // Физика низких температур. — 2010. — Т. 36, № 7. — С. 790–796. — Бібліогр.: 19 назв. — англ.
Підтримка:
Authors are thankful to UGC– DAE CSR, Indore and to Dr. V. Ganesan for their support in carrying out thermopower measurements. Financial assistance from MPCST, Bhopal, India is also gratefully acknowledged. One of us IM acknowledges CSIR, New Delhi for the award of senior research fellowship.
Дата:
2010
Переглядів:
721
Завантажень:
512
Анотація:
With a view to explain the thermoelectric effects of La₀.₈Ca₀.₂MnO₃ and La₀.Ce₀.₂MnO₃ polycrystalline samples and to seek the role of scattering mechanism, a systematic investigation of thermopower S(T) in the metallic phase have been undertaken. Within the relaxation time approximation, it is noticed that, the phonon drag S(T) with scattering of phonons from defects, grain boundaries, phonons and charge carriers in these samples are effective in the metallic regime. Later on, Mott expression is employed to incorporate the carrier diffusive thermopower. The temperature dependence of the S(T) is determined by competition among the several operating scattering mechanisms for the heat carriers and a balance between carrier diffusion and phonon drag contributions in the polycrystalline samples of La₀.₈Ca₀.₂MnO₃ and La₀.Ce₀.₂MnO₃.
