Unconventional Ferromagnetic Transition in La1-xCaxMnO3

Abstract

Neutron scattering has been used to study the magnetic correlations and long wavelength spin dynamics of La1-xCaxMnO3 in the ferromagnetic regime (0<=x<1/2). For x=1/3 (Tc=250K) where the magnetoresistance effects are largest the system behaves as an ideal isotropic ferromagnet at low T, with a gapless (<0.04meV) dispersion relation E=Dq^2 and D(T=0)~170 meV-A-1. However, an anomalous strongly-field-dependent diffusive component develops above ~200K and dominates the fluctuation spectrum as T approaches Tc. This component is not present at lower x.

Revtex, 4 pages, four ps figures available upon request. Physical Review Letters (in press)

References in corpus (1)

• Double Exchange Alone Does Not Explain the Resistivity of $L{a}_{1-x}S{r}_{x}Mn{O}_3$

Cited by in corpus (108)

• Colossal Magnetoresistant Materials: The Key Role of Phase Separation
• Modification of the Landau-Lifshitz Equation in the Presence of a Spin-Polarized Current in CMR and GMR Materials
• Extrinsic Magnetotransport Phenomena in Ferromagnetic Oxides
• Colossal Effects in Transition Metal Oxides Caused by Intrinsic Inhomogeneities
• Colossal Magnetoresistance is a Griffiths Singularity
• A Survey of the Van Hove Scenario for High-T_c Superconductivity With Special Emphasis on Pseudogaps and Striped Phases
• Tricritical Point and the Doping Dependence of the Order of the Ferromagnetic Phase Transition of La1-xCaxMnO3
• Optical Conductivity of Manganites: Crossover from Jahn-Teller Small Polaron to Coherent Transport in the Ferromagnetic State
• Liquid-like spatial distribution of magnetic polarons revealed by neutron scattering in La{1-x}Ca{x}MnO3
• Charge Ordering and Polaron Formation in the Magnetoresistive Oxide La0.7Ca0.3MnO3
• Impact of Charge Ordering on Magnetic Correlations in Perovskite (Bi,Ca)MnO_3
• Relevance of Cooperative Lattice Effects and Correlated Disorder in Phase-Separation Theories for CMR Manganites
• Martensitic accommodation strain and the metal-insulator transition in manganites
• Evolution of the low-frequency spin dynamics in ferromagnetic manganites
• Ferromagnetism and electron-phonon coupling in the manganites
• Mesoscopic and Microscopic Phase Segregation in Manganese Perovskites
• Magnon Damping by magnon-phonon coupling in Manganese Perovskites
• Low-temperature electrical transport and double exchange in La(Pb,Ca)MnO
• Specific heat and magnetic order in LaMnO_{3+δ}
• Charge Transport in Manganites: Hopping Conduction, the Anomalous Hall Effect and Universal Scaling
• Nanoscale Phase Separation in Colossal Magnetoresistance Materials: A Lesson for the Cuprates?
• Softening and Broadening of the Zone Boundary Magnons in Pr0.63Sr0.37MnO3
• Noise Probe of the Dynamic Phase Separation in La2/3Ca1/3MnO3
• The self-organised phases of manganites
• Temperature and field dependence of the phase separation, structure, and magnetic ordering in La${}_{1-x}$Ca${}_x$MnO${}_3$, ($x=0.47$, 0.50, and 0.53)
• Observation of two time scales in the ferromagnetic manganite La(1-x)Ca(x)MnO(3), x = 0.3
• Neutron scattering investigation of magnetic bilayer correlations in $L{a}_{1.2}S{r}_{1.8}M{n}_2{O}_7$
• Magnetic Order and Dynamics in an Orbitally Degenerate Ferromagnetic Insulator
• Ferromagnetism in Electronic Models for Manganites
• Structure and Spin Dynamics of La${}_{0.85}$Sr${}_{0.15}$MnO${}_3$
• Magnetization Reversal and Nanoscopic Magnetic Phase Separation in Doped La1-xSrxCoO3
• First-order nature of the ferromagnetic phase transition in (La-Ca)MnO_3 near optimal doping
• Temperature dependent d-d excitations in manganites probed by resonant inelastic x-ray scattering
• Spin dynamics of strongly-doped La_{1-x}Sr_xMnO_3
• Anomalous ferromagnetic spin fluctuations in an antiferromagnetic insulator Pr_{1-x}Ca_{x}MnO_{3}
• Observation of spin glass state in weakly ferromagnetic Sr${}_2$FeCoO${}_6$ double perovskite
• Crystal and magnetic structure of the La${}_{1-x}$Ca${}_x$MnO${}_3$ compound $(x=0.8,0.85)$
• Microphase separation in Pr0.67Ca0.33MnO3 by small angle neutron scattering
• A-site Ordering versus Electronic Inhomogeneity in CMR-Manganite Films
• Insulator to Metal Transition Induced by Disorder in a Model for Manganites
• Muon Spin Relaxation Study of (La, Ca)MnO3
• Unveiling First Order CMR Transitions in the Two-Orbital Model for Manganites
• Interference Effects in the Conductance of Multi-Level Quantum Dots
• Phase diagram and magnetic properties of La${}_{1-x}$Ca${}_x$MnO${}_3$ compound for $0\le x\le 0.23$
• Phase separation frustrated by the long range Coulomb interaction II: Applications
• Confined spin waves reveal an assembly of nanosize domains in ferromagnetic La(1-x)CaxMnO3 (x=0.17,0.2)
• Crystal and magnetic structure of La${}_{1-x}$Ca${}_x$MnO${}_3$ compound $(0.11\leq x\leq 0.175
• Colossal Magnetoresistance Observed in Monte Carlo Simulations of the One- and Two-Orbital Models for Manganites
• An electron paramagnetic resonance study of Pr_{0.6}Ca_{0.4}MnO_{3} across the charge ordering transition
• Magnons in Ferromagnetic Metallic Manganites
• Spin Dynamics of the Magnetoresistive Pyrochlore Tl_2Mn_2O_7
• Magnetic phase diagram for a non-extensive system: Experimental connection with manganites
• Double-exchange is not the cause of ferromagnetism in doped manganites
• Structural and magnetic ordering in Pr0.65(CaySr1-y)0.35MnO3: "quantum critical point" versus phase segregation scenarios
• Spin-wave dispersion in orbitally ordered La(0.5)Sr(1.5)MnO(4)
• Influence of Nearest-Neighbor Coulomb Interactions on the Phase Diagram of the Ferromagnetic Kondo Model
• Field-induced avalanche to the ferromagnetic state in the phase-separated ground state of manganites
• Spin waves throughout the Brillouin zone and magnetic exchange coupling in ferromagnetic metallic manganites La${}_{1-x}$Ca${}_x$MnO${}_3$ ($x=0.25,0.30$)
• Glassy dynamics of the inhomogeneous metallic phase in La1-xCaxMnO3
• Neutron spectroscopy evidence on the dual nature of magnetic excitations in a van der Waals metallic ferromagnet Fe${}_{2.72}$GeTe${}_2$
• Suppression of the Magnetic Phase Transition in Manganites Close to the Metal-Insulator Crossover
• Low Temperature Magnetic Properties of the Double Exchange Model
• Temperature, magnetic field, and pressure dependence of the crystal and magnetic structures of the magnetocaloric compound Mn1.1Fe0.9(P0.8Ge0.2)
• Spin wave resonances in La_{0.7}Sr_{0.3}MnO_{3} films: measurement of spin wave stiffness and anisotropy field
• ^{139}La Spectrum and Spin-Lattice Relaxation Measurements of La_{2/3}Ca_{1/3}MnO_3 in the Paramagnetic State
• Staggered magnetization, critical behavior and weak ferromagnetic propert ies of LaMnO${}_3$ by muon spin rotation
• Static critical behavior of the ferromagnetic transition in LaMnO3.14 manganite
• Effects of the On-Site Coulomb Repulsion in Double Exchange Magnets
• Phase separation in La${}_{0.5}$Ca${}_{0.5}$MnO${}_3$ doped with 1% ${}^{119}$Sn detected by Mössbauer spectroscopy
• Mesoscopic, Non-equilibrium Fluctuations of Inhomogeneous Electronic States in Manganites
• Soft spin waves in the low temperature thermodynamics of Pr_{0.7}Ca_{0.3}MnO_{3}
• Possible Magnetic separation in Ru doped La0.67Ca0.33MnO3
• Field Dependent Specific-Heat of Rare Earth Manganites
• Diffuse Neutron Scattering Study of Magnetic Correlations in half-doped La0.5Ca0.5-xSrxMnO3 (x = 0.1, 0.3 and 0.4) Manganites
• Fragility of the A-type AF and CE Phases of Manganites: An Exotic Insulator-to-Metal Transition Induced by Quenched Disorder
• Ultrasonic evidence of an uncorrelated cluster formation temperature in manganites with first-order magnetic transition at T_C
• Strain induced magnetic domain evolution and spin re-orientation transition in epitaxial manganite films
• Disorder induced phase segregation in La2/3Ca1/3MnO3 manganites
• First-order transition in the itinerant ferromagnet CoS${}_{1.9}$Se${}_{0.1}$
• Mixed-phase description of colossal magnetoresistive manganites
• Exchange coupling induced antiferromagnetic-ferromagnetic transition in $P{r}_{0.5}C{a}_{0.5}Mn{O}_3/L{a}_{0.5}C{a}_{0.5}Mn{O}_3$ superlattices
• Short-time behavior of a classical ferromagnet with double-exchange interaction
• Quantized spin waves in the metallic state of magnetoresistive manganites
• Influence of oxygen isotope exchange on the ground state of manganites
• Effects of rare earth ion size on the stability of the coherent Jahn-Teller distortions in undoped perovskite manganites
• Polaron-mediated spin correlations in metallic and insulating La${}_{1-x}{A}_x$MnO${}_3$ ($A$=Ca, Sr, or Ba)
• Spin order and lattice frustration in optimally doped manganites. A high temperature NMR study.
• Global persistence exponent of the double-exchange model
• Theory of Ferromagnetic Metal to Paramagnetic Insulator Transition i in R_{1-x}A_{x}MnO_{3}
• Low Temperature Magnetothermodynamics of Pr{0.7}Ca{0.3}MnO{3}
• New Correlated Model of Colossal Magnetoresistive Manganese Oxides
• Spin wave damping arising from phase coexistence below $T_c$ in colossal magnetoresistive La${}_{0.7}$Ca${}_{0.3}$MnO${}_3$
• Brillouin Scattering Studies of La_{0.77}Ca_{0.23}MnO_3 Across Metal-Insulator Transition
• Competition of Zener and polaron phases in doped CMR manganites
• Disorder effects at low temperatures in La_{0.7-x}Y_{x}Ca_{0.3}MnO_{3} manganites
• Interacting chains of orbital polarons in "Colossal" magnetoresistive La1-xSrxMnO3 revealed by spin and lattice dynamics
• Spin dynamics in the generalized ferromagnetic Kondo model for manganites
• Continuum Double Exchange Model
• Paramagnetic Spin Correlations in Colossal Magnetoresistive La0.7Ca0.3MnO3
• Simulations of a classical spin system with competing superexchange and double-exchange interactions
• Scaling relation of spin wave lifetime in double-exchange systems
• Observation of Ferromagnetic Clusters in Bi0.125Ca0.875MnO3
• Composite Polarons in Ferromagnetic Narrow-band Metallic Manganese Oxides
• Large nonzero-moment magnetic strings in antiferromagnetic crystals of the manganite type
• Two-Fluid Behaviour at the Origin of the Resistivity Peak in Doped Manganites
• Magnetic inhomogeneities in the quadruple perovskite manganite [Y${}_{2-x}$Mn${}_x$]MnMnMn${}_4$O${}_{12}$
• On the Role of Exchange Interaction in Magnetic Ordering and Conductivity of Manganites
• Magnetic Scattering Chapter