Electrical resistivity, thermoelectric power and electron spin resonance studies on Pr(1−x)SrxMnO3 (x=0.2, 0.26 and 0.3)

Rama, Nasim Hasan; Sankaranarayan, V.; Rao, M. S. Ramachandra

doi:10.1016/j.jallcom.2007.11.046

Cited by 6 publications

(4 citation statements)

References 27 publications

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“…The inhomogeneous magnetic distribution can be confirmed by the electron spin resonance (ESR) spectrum which is a powerful microscopic probe to reveal magnetic phase transition and magnetic ordering and has been extensively utilized to investigate the magnetic properties of single crystals and polycrystalline samples of various manganites [15][16][17][18]. For example, through transport and ESR studies Zhou et al [16] have shown that for La 0.875 Sr 0.125 MnO 3 bulk composition there is a coexistence of ferromagnetic metallic (FMM) and ferromagnetic insulating (FMI) phases below T c , whereas no FMI signal like the bulk is observed in the same nanosized composition.…”

Section: Introductionmentioning

confidence: 99%

Existence of Griffiths phase in La0.67Ca0.33Mn0.93Fe0.07O3

Joshi

Dayal

Rama

et al. 2009

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Existence of Griffiths phase in La0.67Ca0.33Mn0.93Fe0.07O3

Joshi

Dayal

Rama

et al. 2009

Journal of Alloys and Compounds

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“…This suggests a relation between carriers band width and mobility when the composites are cooled towards T ms . This alters the slope in the S(T) curves at T s [16,17] and the spin wave theory has been incorporated to analyze the temperature dependence of S in low temperature region.…”

Section: Tablementioning

confidence: 99%

Thermopower and magnetocaloric properties in NdSrMnO/CrO3 composites

Ahmed

Mohamed

Paixão

et al. 2018

Journal of Magnetism and Magnetic Materials

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The thermoelectric power (TEP) and magnetocaloric effect (MCE) for (Nd 0.6 Sr 0.4 MnO 3 ) 1-x /(CrO 3 ) x composites have been measured. The TEP measurements show a negative sign value of the Seebeck coefficient (S), in microvolts. TEP data construe in the low range of temperature by the magnon and phonon drag model, whereas at high temperature by small polaron conduction mechanism. Magnetic measurements exhibit that all composites show a paramagnetic-ferromagnetic transition with decreasing temperature. The Arrott plots of composites reveal the occurrence of a second order phase transition. The maximum value of magnetic entropy change (DS) is 2.37 J kg À1 K À1 , achieved fore the composite with x = 0.015. Moreover, the maximum value of relative cooling power (RCP) is 122.1 J kg À1 , achieved for the composite with x = 0.020. These composites may be appropriate for magnetic application near room temperature.

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“…However, it has been claimed that an additional mechanism, Jahn-Teller distortion (JT) could be responsible for the transport properties. The JahnTeller effects cause further degeneracy of the e g orbital of Mn 3+ in MnO 6 octahedral and resulting electrical transport via hopping effect [1,2] . The Magnetoresistance (MR) percentage of MR defined as [(R H -R o )/R o ]*100 where R H is the resistance in the present of magnetic field and R o is the resistance at zero field.…”

Section: Introductionmentioning

confidence: 99%

Effect of Divalent Ions (A = Ca, Ba and Sr) Substitution in La-A-Mn-O Manganite on Structural, Magnetic and Electrical Transport Properties

Lim¹,

Ng²,

Halim³

et al. 2009

American J. of Applied Sciences

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Problem statement: Microstructure of the grain will influence the properties of a polycrystalline manganites when different dopant is introduced. In this work, an effort had been made to investigate the influence of Ca, Ba and Sr substitution in La site. Approach: Polycrystalline manganites compound of La 0.67 A 0.33 MnO 3 where A = Ba, Sr and Ca had been prepared via conventional solid-state reaction method. The structure, microstructure, magnetic and electrical properties had been investigated using XRD, SEM, VSM and four-point probe techniques. Results: XRD spectrums showed that LBMO and LCMO were in single-phase orthorhombic structure whereas LSMO was rhombohedral structure. Scanning electron micrographs showed that LSMO had smaller average grain size as compared to LBMO. However, for LCMO, there was no clear grain boundary that can be observed and all the grains were well connected. The difference in the microstructure image might be due to the variance A-site cation that differs in grain growth. The Curie temperature, T c of LBMO and LSMO was 343.0 and 363.5 K, respectively. But the T c for LCMO was lower then 300 K. The T p for LCMO was 215 K while it was near or above 300K for LBMO and LSMO. All samples showed extrinsic Magnetoresistance (MR) effect. Higher MR was observed well below T c or T p where MR value increased monotonically with the decrease of temperature. This was associated with the different grain and grain boundary formation when different cation was substituted. LCMO displayed the highest low-field MR value (-15.82% at 0.2 T, 90 K) and high-field MR (-25.60% at 1 T, 300 K). Conclusion: Hence, electrical and magnetic transition temperature (T p and T c ) were affected by the average A-site cation radius.

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Electrical resistivity, thermoelectric power and electron spin resonance studies on Pr(1−x)SrxMnO3 (x=0.2, 0.26 and 0.3)

Cited by 6 publications

References 27 publications

Existence of Griffiths phase in La0.67Ca0.33Mn0.93Fe0.07O3

Existence of Griffiths phase in La0.67Ca0.33Mn0.93Fe0.07O3

Thermopower and magnetocaloric properties in NdSrMnO/CrO3 composites

Effect of Divalent Ions (A = Ca, Ba and Sr) Substitution in La-A-Mn-O Manganite on Structural, Magnetic and Electrical Transport Properties

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