Structural and electrical properties of Pr1−xSrxMnO3 (x=0.25, 0.3, 0.35 and 0.4) manganites

Shaikh, M. W.; Varshney, Dinesh

doi:10.1016/j.mssp.2014.07.015

Cited by 20 publications

(9 citation statements)

References 47 publications

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“…When the Re trivalent element is doped by various elements, a proportionate amount of Mn 3+ with the electronic configuration ( ) creating holes in the e g band [5]. On the other hand, in the metallic region, the transport mechanism is governed by the single magnon's scattering contribution, the electron-magnon scattering mechanism, electron-electron and electron-phonon scattering processes [11][12][13]. According to Hund's rule, this charge transfer induces a ferromagnetic coupling between Mn 3+ and Mn 4+ ions which in turn has a dramatic effect on the electrical conductivity [6,7].…”

Section: -Introductionmentioning

confidence: 99%

Electrical transport and giant magnetoresistance in La_0.75Sr_0.25Mn_1−xCr_xO₃ (0.15, 0.20 and 0.25) manganite oxide

et al. 2015

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We have investigated the influence of chromium (Cr) doping on the magneto-electrical properties of polycrystalline samples La0.75Sr0.25Mn1-xCrxO3 (0.15 ≤ x ≤ 0.25), prepared by the sol-gel method. Comparison of experimental data with the theoretical models shows that in the metal-ferromagnetic region, the electrical behavior of the three samples is quite well described by a theory based on electron-electron, electron-phonon and electron-magnon scattering and Kondo-like spin dependent scattering. For the high temperature paramagnetic insulating regime, the adiabatic small polaron hopping (SPH) model is found to fit well the experimental curves.

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Section: -Introductionmentioning

confidence: 99%

Electrical transport and giant magnetoresistance in La_0.75Sr_0.25Mn_1−xCr_xO₃ (0.15, 0.20 and 0.25) manganite oxide

et al. 2015

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“…Therefore, k force constant and the mass of substitutive ion may cause a change in mode frequency. Analogous to that of Nd 1-x Sr x MnO 3 [37], substitution of K ? ion shows phonon softening with x.…”

Section: Discussion and Analysis Of Resultsmentioning

confidence: 99%

“…; j * = 2j for each directional oscillation mode to get the acoustic phonon frequency as [32][33][34][35][36][37] …”

Section: The Modelmentioning

confidence: 99%

Metallic and semi-conducting resistivity behaviour of La0.7Ca0.3−x K x MnO3 (x = 0.05, 0.1) manganites

Varshney

Dodiya

2014

J Theor Appl Phys

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The temperature dependence of electrical resistivity, q, of ceramic La 0.7 Ca 0.3-x K x MnO 3 (x = 0.05, 0.1) is investigated in metallic and semi-conducting phase. The metallic resistivity is attributed to be caused by electron-phonon, electron-electron and electron-magnon scattering. Substitutions affect average mass and ionic radii of A-site resulting in an increase in Debye temperature h D attributed to hardening of lattice with K doping. The optical phonon modes shift gradually to lower mode frequencies leading to phonon softening. Estimated resistivity compared with reported metallic resistivity, accordingly q diff. = [q exp. -{q 0 ? q e-ph (=q ac ? q op )}], infers electron-electron and electron-magnon dependence over most of the temperature range. Semi-conducting nature is discussed with variable range hopping and small polaron conduction model. The decrease in activation energies and increase in density of states at the Fermi level with enhanced Ca doping is consistently explained by cationic disorder and Mn valence.

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“…С практической точки зрения, допированные стронцием манганиты R 1−x Sr x MnO 3 редкоземельных металлов, являются перспективными материалами для использования в спинтронике [6][7][8], разработки твердотопливных элементов (ТОТЭ) [9][10][11][12]. Cтруктурные, транспортные и магнитные свойства допированных манганитов зависят от соотношения поливалентных ионов марганца Mn 3+ /Mn 4+ , размера катиона в A-подрешетке [1,13,14]. Изменение уровня допирования (x), а также внешних условий -температуры, приложенного магнитного поля и т. д. приводит к формированию различных видов упорядочения [4,15].…”

Section: Introductionunclassified

Структура и электропроводность перовскитов Pr-=SUB=-1-x-=/SUB=-Sr-=SUB=-x-=/SUB=-MnO-=SUB=-3-=/SUB=- (x=0; 0.15; 0.25)

Vedmid¹,

Федорова²,

Balakireva³

et al. 2021

Физика Твердого Тела

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Pr1-xSrxMnO3 manganites (x=0; 0.15; 0.25) were synthesized by the solid-phase method at a temperature of 1250°C and have an orthorhombic perovskite-like structure (space group Pbnm). A comprehensive study of the effect of praseodymium substitution with strontium on the temperature features of the transformation of the crystal structure of the studied perovskites was performed using high-temperature radiography and differential thermal analysis. It was determined that the temperature of the Jahn-Тeller effect significantly decreases with the introduction of strontium. It is established that all samples have a semiconductor character of conductivity. Strontium doping significantly increases the electrical conductivity of praseodymium manganites, especially at temperatures below 450°C.

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Structural and electrical properties of Pr1−xSrxMnO3 (x=0.25, 0.3, 0.35 and 0.4) manganites

Cited by 20 publications

References 47 publications

Electrical transport and giant magnetoresistance in La_0.75Sr_0.25Mn_1−xCr_xO₃ (0.15, 0.20 and 0.25) manganite oxide

Electrical transport and giant magnetoresistance in La_0.75Sr_0.25Mn_1−xCr_xO₃ (0.15, 0.20 and 0.25) manganite oxide

Metallic and semi-conducting resistivity behaviour of La0.7Ca0.3−x K x MnO3 (x = 0.05, 0.1) manganites

Структура и электропроводность перовскитов Pr-=SUB=-1-x-=/SUB=-Sr-=SUB=-x-=/SUB=-MnO-=SUB=-3-=/SUB=- (x=0; 0.15; 0.25)

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Structural and electrical properties of Pr1−xSrxMnO3 (x=0.25, 0.3, 0.35 and 0.4) manganites

Cited by 20 publications

References 47 publications

Electrical transport and giant magnetoresistance in La0.75Sr0.25Mn1−xCrxO3 (0.15, 0.20 and 0.25) manganite oxide

Electrical transport and giant magnetoresistance in La0.75Sr0.25Mn1−xCrxO3 (0.15, 0.20 and 0.25) manganite oxide

Metallic and semi-conducting resistivity behaviour of La0.7Ca0.3−x K x MnO3 (x = 0.05, 0.1) manganites

Структура и электропроводность перовскитов Pr-=SUB=-1-x-=/SUB=-Sr-=SUB=-x-=/SUB=-MnO-=SUB=-3-=/SUB=- (x=0; 0.15; 0.25)

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Electrical transport and giant magnetoresistance in La_0.75Sr_0.25Mn_1−xCr_xO₃ (0.15, 0.20 and 0.25) manganite oxide

Electrical transport and giant magnetoresistance in La_0.75Sr_0.25Mn_1−xCr_xO₃ (0.15, 0.20 and 0.25) manganite oxide