Structural, magnetic and transport study of monovalent Na-doped manganite Pr0.55Na0.05Sr0.4MnO3

Thaljaoui, R.; Boujelben, W.; Pękała, M.; Pękała, K.; Mucha, J.; Cheikhrouhou, A.

doi:10.1016/j.jallcom.2013.01.008

Cited by 31 publications

(29 citation statements)

References 38 publications

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“…The θ D values are estimated from the lnρ versus T −1 plots, where the deviation from the linearity appears in low temperature side of insulating region ( T > T P ), as shown in Figure . The calculated parameters are in agreement with the reported values for similar manganites samples . The values of E a for the nano sample are found to be small compared to bulk samples.…”

Section: Resultssupporting

confidence: 89%

“…In the present case, small polaron hopping (SPH) conduction mechanism has been invoked to understand the electrical resistivity in the temperature range, T > T P . The equation governing the SPH model is given by the relation

ρ = C T \exp true(\frac{E_{a}}{k_{B} T} true)

where C is the pre‐exponential factor, E a is the polaron activation energy, and k B is the Boltzmann's constant. The pre‐exponential factor ( C ) can be expressed as,

C = (2 k_{B}) / (3 n e^{2} a^{2} υ_{p h})

where e is the electronic charge, n is the charge carrier density, a is the site‐to‐site hopping distance, and

υ_{p h}

is the longitudinal optical phonon frequency.…”

Section: Resultsmentioning

confidence: 99%

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Irreversible Meta‐Magnetic Transition in Charge Ordered Nd_0.5Ca_0.5MnO₃ Manganite

Swain

Venkataiah

2019

Physica Status Solidi (b)

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The investigation of charge ordering (CO) suppression and consequence effects in manganites are of interest to the scientific community as they help them to understand the interactions among the spin, charge and orbital degrees of freedom of conduction electrons. In this work, the suppression of CO in small bandwidth half‐doped manganite, Nd0.5Ca0.5MnO3 (NCMO) has been demonstrated by reducing the particle size. Bulk and nano forms of NCMO materials are prepared by sol‐gel technique and characterized by various physicochemical techniques. The magnetic and magnetotransport properties of bulk samples show the exciting features, viz., CO, training and irreversible metamagnetic effects, whereas these features are significantly suppressed in the nanoscale sample. The observed behavior in the present investigation is explained in terms of magnetic phase separation and spin memory effects. Our investigation establishes a combined effect of surface spin disorder and lattice strains for the suppression of CO behavior in NCMO manganite system.

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Section: Resultssupporting

confidence: 89%

ρ = C T \exp true(\frac{E_{a}}{k_{B} T} true)

where C is the pre‐exponential factor, E a is the polaron activation energy, and k B is the Boltzmann's constant. The pre‐exponential factor ( C ) can be expressed as,

C = (2 k_{B}) / (3 n e^{2} a^{2} υ_{p h})

where e is the electronic charge, n is the charge carrier density, a is the site‐to‐site hopping distance, and

υ_{p h}

is the longitudinal optical phonon frequency.…”

Section: Resultsmentioning

confidence: 99%

Irreversible Meta‐Magnetic Transition in Charge Ordered Nd_0.5Ca_0.5MnO₃ Manganite

Swain

Venkataiah

2019

Physica Status Solidi (b)

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“…The Neel temperature, TN was observed to decrease from 123 K, 115 K and 107 K for x = 0, 0.05 and 0.10 samples respectively suggestively due to a weakening of CO state in the compound. A similar suggestion was also proposed by Tarhouni et al and Thaljaou et al [20,21]. In the present study, the weakening of the CO state is also supported by the movement for peak of dlnρ/dT -1 vs T curve for x = 0 and 0.05 samples.…”

Section: Morphology Analysissupporting

confidence: 93%

Observation of Charge Ordering Signal in Monovalent Doped Nd0.75Na0.25-xKxMn1O3 (0 â‰¤ x â‰¤ 0.10) Manganites

Razali¹,

Ibrahim²,

Shamsuddin³

et al. 2018

IJET

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K doping in the compound of Nd0.75Na0.25-xKxMn1O3 (x = 0, 0.05 and 0.10) manganites have been investigated to study its effect on crystalline phase and surface morphology as well as electrical transport and magnetic properties. The structure properties of the Nd0.75Na0.25-xKxMnO3 manganite have been characterized using X-ray diffraction measurement and it proved that the crystalline phase of samples were essentially single phased and indexed as orthorhombic structure with space group of Pnma. The morphological study from scanning electron microscope showed there was an improvement on the grains boundaries and sizes as well as the compactness with K doping suggestively due to the difference of ionic radius. On the other hand, DC electrical resistivity measurement showed all samples exhibit insulating behavior. However, analysis of dlnρ/dT-1 vs. T revealed the clearly peaks could be observed at temperature 210K for x = 0 and the peaks were shifted to the lower temperature around 190 K and 165 K for x = 0.05 and x = 0.1 respectively, indicate the existence of charge ordering (CO) state in the compound. Meanwhile, the investigation on magnetic behavior showed all samples exhibit transition from paramagnetic phase to anti-ferromagnetic phase with decreasing temperature and the TN was observed to shift to lower temperature suggestively due to weakening of CO state

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“…For the sample with x=0.05, we have found a higher value of the relative cooling power (RCP) about 247.51J/kg under a field change of 5T. Besides, our research group has widely studied the effect of monovalent elements on the physical properties of Pr 0.6 Sr 0.4 MnO 3 [24][25][26][27][28]. We have found an important value of the entropy change equal to 1.3J/kg.K and a RCP value equal to 93J/kg for Pr 0.55 Na 0.05 Sr 0.4 MnO 3 under an applied magnetic field of 2T [24], which confirms its importance as magnetic refregerant.…”

Section: Introductionmentioning

confidence: 73%

“…Besides, our research group has widely studied the effect of monovalent elements on the physical properties of Pr 0.6 Sr 0.4 MnO 3 [24][25][26][27][28]. We have found an important value of the entropy change equal to 1.3J/kg.K and a RCP value equal to 93J/kg for Pr 0.55 Na 0.05 Sr 0.4 MnO 3 under an applied magnetic field of 2T [24], which confirms its importance as magnetic refregerant. Therefore, we present firstly in this work the results about the monovalent ion substitution (K + and Na + ) for trivalent Pr 3+ ion on the structural, magnetic and magnetocaloric properties of Pr 0.5 A 0.05 Sr 0.45 MnO 3 (A=K and Na).…”

Section: Introductionmentioning

confidence: 88%

Magnetic and magnetocaloric study of manganite compounds Pr0.5A0.05Sr0.45MnO3 (A=Na and K) and composite

Jerbi

Krichene

Chniba-Boudjada

et al. 2015

Physica B: Condensed Matter

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Structural, magnetic and transport study of monovalent Na-doped manganite Pr0.55Na0.05Sr0.4MnO3

Cited by 31 publications

References 38 publications

Irreversible Meta‐Magnetic Transition in Charge Ordered Nd_0.5Ca_0.5MnO₃ Manganite

Irreversible Meta‐Magnetic Transition in Charge Ordered Nd_0.5Ca_0.5MnO₃ Manganite

Observation of Charge Ordering Signal in Monovalent Doped Nd0.75Na0.25-xKxMn1O3 (0 â‰¤ x â‰¤ 0.10) Manganites

Magnetic and magnetocaloric study of manganite compounds Pr0.5A0.05Sr0.45MnO3 (A=Na and K) and composite

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Structural, magnetic and transport study of monovalent Na-doped manganite Pr0.55Na0.05Sr0.4MnO3

Cited by 31 publications

References 38 publications

Irreversible Meta‐Magnetic Transition in Charge Ordered Nd0.5Ca0.5MnO3 Manganite

Irreversible Meta‐Magnetic Transition in Charge Ordered Nd0.5Ca0.5MnO3 Manganite

Observation of Charge Ordering Signal in Monovalent Doped Nd0.75Na0.25-xKxMn1O3 (0 â‰¤ x â‰¤ 0.10) Manganites

Magnetic and magnetocaloric study of manganite compounds Pr0.5A0.05Sr0.45MnO3 (A=Na and K) and composite

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Irreversible Meta‐Magnetic Transition in Charge Ordered Nd_0.5Ca_0.5MnO₃ Manganite

Irreversible Meta‐Magnetic Transition in Charge Ordered Nd_0.5Ca_0.5MnO₃ Manganite