Colossal magnetoresistance in manganites as a multicritical phenomenon

Abstract

The colossal magnetoresistance in manganites AMnO_3 is studied from the viewpoint of multicritical phenomena. To understand the complicated interplay of various phases, we study the Ginzburg-Landau theory in terms of both the mean-field approximation and the renormalization-group analysis to compare with the observed phase diagram. Several novel features, such as the first-order ferromagnetic transition, and the dip in the transition temperature near the multicritical point, can be understood as driven by enhanced fluctuations near the multicritical point. Furthermore, we obtain a universal scaling relation for the H/M-M^2 plot (Arrott plot), which fits rather well with the experimental data, providing the further evidence for the enhanced fluctuation.

4 pages, 3 figures

References in corpus (2)

• Colossal Effects in Transition Metal Oxides Caused by Intrinsic Inhomogeneities
• Colossal Magnetoresistance is a Griffiths Singularity

Cited by in corpus (19)

• Coexisting charge modulation and ferromagnetism produces long period phases in manganites: new example of electronic soft matter
• Competing Orders and Disorder-induced Insulator to Metal Transition in Manganites
• Modelling colossal magnetoresistance manganites
• Coulomb Interactions and Nanoscale Electronic Inhomogeneities in Manganites
• Multicritical end-point of the first-order ferromagnetic transition in colossal magnetoresistive manganites
• Neutron scattering studies on stripe phases in non-cuprate materials
• A local metallic state in globally insulating $L{a}_{1.24}S{r}_{1.76}M{n}_2{O}_7$ well above the metal-insulator transition
• Two-Staged Magnetoresistance Driven by Ising-like Spin Sublattice in SrCo6O11
• Probing the Griffiths like phase, unconventional dual glassy states, giant exchange bias effects and its correlation with its electronic structure in Pr2-xSrxCoMnO6
• Melting of magnetic correlations in charge-orbital ordered La(0.5)Sr(1.5)MnO(4) : competition of ferro and antiferromagnetic states
• Optical phase diagram of perovskite-type colossal magnetoresistance manganites with near-half doping
• Field-Induced Ferromagnetic Order and Colossal Magnetoresistance in La_{1.2}Sr_{1.8}Mn_2O_7: a ^{139}La NMR study
• Fe-doping-induced evolution of charge-orbital ordering in a bicritical-state manganite
• Effect of oxygen off-stoichiometry on coupled structural and magnetic phase-transitions in La0.15Sr0.85MnO3-d (d = 0.02, 0.14)
• Dopant-dependent impact of Mn-site doping on the critical-state manganites: R0.6Sr0.4MnO3 (R=La, Nd, Sm, and Gd)
• Delicate competing electronic states in ultrathin manganite films
• Phase equilibrium in two orbital model under magnetic field
• An Origin of CMR: Competing Phases and Disorder-Induced Insulator-to-Metal Transition in Manganites
• Re-entrant Behavior and Gigantic Response in Disordered Spin-Peierls System