Investigation of the role of Ag in Pr$_{1-x}$Ag$_x$MnO$_3$ manganites

Ahmadvand, Hossein; Salamati, Hadi; Kameli, Parviz

doi:10.48550/arxiv.0906.1354

Cited by 1 publication

(3 citation statements)

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“…The details of preparation and characterization of the samples can be found in Ref. [24]. The microstructure studies were performed by scanning electron microscopy (SEM).…”

Section: Methodsmentioning

confidence: 99%

“…In Ref. [24], we discussed that the Ag + ion does not substitute for the Pr 3+ site and locate at the GBs in the metallic form.…”

Section: A Field and Frequency Dependencementioning

confidence: 99%

“…The sintering of powder produced a coarse powder with typical particle size of 0.8 mm or smaller, which is a result of the attachment of powder particles to each other during the high temperature sintering. For this experiment we used the sample with x=0.2 (Pr 0.8 Ag 0.2 MnO 3 ), which has similar physical properties to the sample with x=0.15 [24]. The χ ′ and χ ′′ vs T curves, measured in an ac field of 10 Oe, are given in Fig.…”

Section: B Tuning the Pinning Strengthmentioning

confidence: 99%

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The effect of grain boundaries on the domain wall dynamics in Pr1−xAgxMnO3 manganites

Ahmadvand

Salamati

Kameli

2010

Journal of Applied Physics

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We performed detailed ac susceptibility measurements on Pr 1−x Ag x MnO 3 (x=0.15, 0.20) manganites and observed unusual and interesting features, which are associated with the domain walls and the effects of grain-boundaries on their movements. It is shown that the ac field, frequency, temperature, thermal cycling and grain coupling significantly influence the real and especially imaginary parts of the ac susceptibility. We argue that the cooperative depinning of the domain walls from the grain-boundaries accompanying with a large distance movements of the walls leads to the appearance of an anomaly at low temperatures. The anomaly is observed above a threshold ac field and depends on the intergrain coupling. The results show that in the powdered form of bulk samples, the anomaly disappears and the ac field dependence of the χ ′ and χ ′′ suppresses. Below the anomaly temperature, significant and unusual thermal hysteresis occurs in the real and especially imaginary parts of the ac susceptibility. Thermal hysteresis depends on the thermal cycling and indicates thermally irreversible wall pinning and depinning. The susceptibility is practically frequency-independent in the temperature range of thermal hysteresis i.e. below the anomaly. The frequency dependence of ac susceptibility between the anomaly temperature and the transition temperature is discussed by considering the temperature dependence of the relaxation process of the domain walls. * Corresponding author; ahmadvand@ph.iut.ac.irRecently, we reported the structural, magnetic and electrical properties of Pr 1−x Ag x MnO 3 (0 ≤ x ≤ 0.25) manganites [24]. It was reported that the Ag + ion does not substitute

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“…The details of preparation and characterization of the samples can be found in Ref. [24]. The microstructure studies were performed by scanning electron microscopy (SEM).…”

Section: Methodsmentioning

confidence: 99%

“…In Ref. [24], we discussed that the Ag + ion does not substitute for the Pr 3+ site and locate at the GBs in the metallic form.…”

Section: A Field and Frequency Dependencementioning

confidence: 99%

Section: B Tuning the Pinning Strengthmentioning

confidence: 99%

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