Jahn-Teller effect and stability of the charge-ordered state in La1-xCaxMnO3 (0.5<x<0.9) manganites

Abstract

The longitudinal ultrasonic sound velocity and attenuation, the resistivity, and lattice parameters were studied as a function of temperature from 30 K to 300 K in La1-xCaxMnO3 (0.5<x<0.9). For all the samples, a dramatic stiffening of the sound velocity below the charge ordering transition temperature TCO was directly driven by distinct changes of the lattice parameters due to the formation of long range ordering of Jahn-Teller distorted MnO6 octahedra. The relative change of the sound velocity (DeltaV/V) below TCO depends on the Ca concentration x and reaches the maximum at x=0.75, implying that the effective strength of electron-lattice interaction with the Jahn-Teller distortion is the strongest at x=0.75 and hence the charge ordered state is mostly stabilized near x=0.75 and insensitive to the application of a magnetic field, which is supported by the charge transport properties under high magnetic fields up to 14T.

16 pages, 5 figures, PDF

References in corpus (7)

• Colossal Magnetoresistant Materials: The Key Role of Phase Separation
• Ferromagnetic, A-type, and Charge-Ordered CE-type States in Doped Manganites using Jahn-Teller Phonons
• Charge-orbital ordering and phase-separation in the two-orbital model for manganites: Roles of Jahn-Teller phononic and Coulombic interactions
• Topological Scenario for Stripe Formation in Manganese Oxides
• Origin of the Charge-Orbital Stripe Structure in La_(1-x)Ca_(x)MnO_(3) (x=1/2, 2/3)
• Charge ordering in doped manganese oxides: lattice dynamics and magnetic structure
• Influence of the cooperative Jahn-Teller effect on the transport- and magnetic properties of La_{7/8}Sr_{1/8}MnO_3 single crystals

Cited by in corpus (7)

• Multi-messenger nano-probes of hidden magnetism in a strained manganite
• Colossal Magnetoresistance Manganites and Related Prototype Devices
• Observation of charge-density-wave excitations in manganites
• The role of the cooperative Jahn-Teller effect in the charge ordered La1-xCaxMnO3 (0.5<=x<=0.87) manganites
• The transport, ultrasound, and structural properties for the charge ordered Pr1-xCaxMnO3 (0.5<=x<=0.875) manganites
• Suppression of charge-ordering and appearance of magnetoresistance in a spin-cluster glass manganite La0.3Ca0.7Mn0.8Cr0.2O3
• Magnetotransport properties of La${}_{1-x}$Ca${}_x$MnO${}_3$ (0.52 $\le x\le$ 0.75): signature of phase coexistence