Investigation of magneto-transport properties of the co-doped La1.6-xPrxCa1.4-xBaxMn2O7 (x=0.2 and 0.4) double-layered manganite
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Dosyalar
Tarih
2021
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Springer
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Structural and magneto-electrical transport properties of double-layered La1.6-xPrxCa1.4-xBaxMn2O7 (x = 0.2 and 0.4) manganite compounds were studied. X-ray diffraction patterns refinement shows that the samples crystallize in a tetragonal I4/mmm structure, whereas a rhombohedral structure phase with R-3-c space group is detected as a secondary phase. The electrical resistivity under 0 and 1 T exhibited a metal-insulator transition at T-MI. It is found that the rho(T) decreases with increasing Pr-Ba contents. Magnetoresistance (MR%) curves displayed a maximum value of similar to 51.69% at 63 K for the x = 0.2 sample and decreases with increasing Pr-Ba concentrations to similar to 33.44% at 64 K for x = 0.4 under 1 T. The obtained values of the temperature coefficient of resistivity for both samples have similar trend as T-MI. Below T-MI,T- rho(T = rho(0) - rho T-0.5(0.5) + rho T-2(2) + rho T-5(5) model fits well the resistivity curves which reflect a combination of the grain boundary effects, weak localization, electron-electron, and electron-phonon scattering to the electrical resistivity. Above T-MI, the non-adiabatic small polaron hopping model describes the electrical resistivity behavior in T > theta(D)/2 region. The Mott's 3D variable range hopping mechanism (3D-VRH) was found to be the most suitable mechanism for describing the high-temperature resistivity behavior between T-MI and theta(D)/2. The density of states near the Fermi level N(E-F) and mean hopping energy (E-h) of the charge carriers have been calculated from the experimental curves using Mott's 3D-VRH model. The experimental and fitting curves of the resistivity and the related results are discussed in detail.
Açıklama
This work was supported by the Directorate General for Scientific Research and Technological Development-Algeria.
Anahtar Kelimeler
Magnetic-Properties, Hopping Conduction, Electrical-Properties, Motts Parameters
Kaynak
Journal of Materials Science-Materials in Electronics
WoS Q Değeri
Q2
Scopus Q Değeri
Q2
Cilt
32
Sayı
14
Künye
Denbri, F., Mahamdioua, N., Meriche, F., Altintas, S. P., & Terzioglu, C. (2021). Investigation of magneto-transport properties of the co-doped La1. 6-xPrxCa1. 4-xBaxMn2O7 (x= 0.2 and 0.4) double-layered manganite. Journal of Materials Science: Materials in Electronics, 32(14), 18808-18824.
