Structural, transport, and magnetic properties of RMnO3 perovskites (R=La, Pr, Nd, Sm, 153Eu, Dy)

Dąbrowski, B.; Koleśnik, S.; Baszczuk, A.; Chmaissem, O.; Maxwell, Timothy; Mais, J.

doi:10.1016/j.jssc.2004.12.006

Cited by 135 publications

(89 citation statements)

References 18 publications

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“…Many orthorhombic RMnO 3 perovskites display antiferromagnetic ground state at low temperatures depending on the rare earth ion. 6 Hole doped RMnO 3 oxides showed a complex magnetic phase diagram 7 with respect to temperature in contrast to the behavior observed in orthorhombic LaMnO 3 with hole doping. 8 Also, Spin Glass (SG) nature is often found with an increase in the percentage of holes.…”

Section: Introductionmentioning

confidence: 88%

Effects of Dy sub lattice dilution on transport and magnetic properties in Dy1-xKxMnO3

et al. 2017

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Interaction of multiple oxidation states of manganese ions with rare earth ions in manganites leads to the observation of various magnetic ground states. To understand the effect of average ionic size on electrical conductivity and magnetic ground state properties in Dy1-xKxMnO3 (x=0.0, 0.1, 0.2 & 0.3), we have investigated electron transport as a function of temperature and magnetic properties as a function of temperature, frequency and magnetic field of these compounds. Although mixed valent manganese ions can facilitate a double exchange interaction via oxygen ion leading to a ferromagnetic metallic ground state, no insulator-metal transition was detected. On the other hand, in the compounds with x=0.0 to 0.2, transport properties suggested an adiabatic small polaron hopping conduction mechanism. However, x=0.3 compound followed a variable range hopping conduction. Temperature variation of magnetization data exhibited three different types of transitions involving Mn and Dy ions. The bifurcation between zero field cooled and field cooled magnetization data was observed in all the compounds. Field-dependent magnetization of all the compounds showed hysteresis loops for temperatures less than 10 K. Although large irreversibility between zero field cooled and field cooled magnetization data was observed with a peak for x=0.3, the peak temperatures did not alter with frequency ruling out the possibility of spin glass behavior. The presence of hysteresis loops and lack of saturation magnetization implied the simultaneous presence of ferromagnetic and antiferromagnetic exchange interactions well within the antiferromagnetic ordering of Mn ions.

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Section: Introductionmentioning

confidence: 88%

Effects of Dy sub lattice dilution on transport and magnetic properties in Dy1-xKxMnO3

et al. 2017

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“…No discernable trend could be identified for substitution of the A-site from La to Dy [74][75][76][77][78][79][80] (Figure 2g) under the caveat that some of the data was only available for temperatures >300 K (Table A2). For the ORR data of Suntivich et al [22], the activity trend matches that of the typical conductivity of the used LaBO 3 perovskites.…”

Section: Effect Of Chemical Substitution On Activitymentioning

confidence: 99%

Perovskite Electrocatalysts for the Oxygen Reduction Reaction in Alkaline Media

Risch

2017

Catalysts

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Abstract:Oxygen reduction is considered a key reaction for electrochemical energy conversion but slow kinetics hamper application in fuel cells and metal-air batteries. In this review, the prospect of perovskite oxides for the oxygen reduction reaction (ORR) in alkaline media is reviewed with respect to fundamental insight into activity and possible mechanisms. For gaining these insights, special emphasis is placed on highly crystalline perovskite films that have only recently become available for electrochemical interrogation. The prospects for applications are evaluated based on recent progress in the synthesis of perovskite nanoparticles. The review concludes with the current understanding of oxygen reduction on perovskite oxides and a perspective on opportunities for future fundamental and applied research.

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“…Could it be that superexchange is driving such a transition? To answer this question we calculated T KK for representative elements of the REMnO 3 series (rare earths RE = La, Nd, Tb, Dy), systems for which T OO has been measured [37][38][39][40]. The results are shown in Figure 11.…”

Section: The Origin Of Orbital Orderingmentioning

confidence: 99%

Massively parallel simulations of strong electronic correlations: Realistic Coulomb vertex and multiplet effects

Baumgärtel

Ghanem

Kiani

et al. 2017

Eur. Phys. J. Spec. Top.

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Abstract. We discuss the efficient implementation of general impurity solvers for dynamical mean-field theory. We show that both Lanczos and quantum Monte Carlo in different flavors (Hirsch-Fye, continuoustime hybridization-and interaction-expansion) exhibit excellent scaling on massively parallel supercomputers. We apply these algorithms to simulate realistic model Hamiltonians including the full Coulomb vertex, crystal-field splitting, and spin-orbit interaction. We discuss how to remove the sign problem in the presence of non-diagonal crystal-field and hybridization matrices. We show how to extract the physically observable quantities from imaginary time data, in particular correlation functions and susceptibilities. Finally, we present benchmarks and applications for representative correlated systems.

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Structural, transport, and magnetic properties of RMnO3 perovskites (R=La, Pr, Nd, Sm, 153Eu, Dy)

Cited by 135 publications

References 18 publications

Effects of Dy sub lattice dilution on transport and magnetic properties in Dy1-xKxMnO3

Effects of Dy sub lattice dilution on transport and magnetic properties in Dy1-xKxMnO3

Perovskite Electrocatalysts for the Oxygen Reduction Reaction in Alkaline Media

Massively parallel simulations of strong electronic correlations: Realistic Coulomb vertex and multiplet effects

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