Nanoclustering phase competition induces the resistivity hump in colossal magnetoresistive manganites

Abstract

Using a two-band double-exchange model with Jahn-Teller lattice distortions and super-exchange interactions, supplemented by quenched disorder, at electron density $n=0.65$, we explicitly demonstrate the coexistence of the $n$ = 1/2-type ($\pi ,\pi$) charge-ordered and the ferromagnetic nanoclusters above the ferromagnetic transition temperature $T_{\mathrm{c}}$ in colossal magnetoresistive (CMR) manganites. The resistivity increases due to the enhancement of the volume fraction of the charge-ordered and the ferromagnetic nanoclusters with decreasing the temperature down to $T_{\mathrm{c}}$. The ferromagnetic nanoclusters start to grow and merge, and the volume fraction of the charge-ordered nanoclusters decreases below $T_{\mathrm{c}}$, leading to the sharp drop in the resistivity. By applying a small external magnetic field $h$, we show that the resistivity above $T_{\mathrm{c}}$ increases, as compared with the case when $h=0$, a fact which further confirms the coexistence of the charge-ordered and the ferromagnetic nanoclusters. In addition, we show that the volume fraction of the charge-ordered nanoclusters decreases with increasing the bandwidth and consequently the resistivity hump diminishes for large bandwidth manganites, in good qualitative agreement with experiments. The obtained insights from our calculations provide a complete pathway to understand the phase competition in CMR manganites.

arXiv comment6 pages, 6 figures

References in corpus (16)

• Colossal Magnetoresistant Materials: The Key Role of Phase Separation
• Phase Separation in Electronic Models for Manganites
• Phase Separation Induced by Orbital Degrees of Freedom in Models for Manganites with Jahn-Teller Phonons
• Ferromagnetic, A-type, and Charge-Ordered CE-type States in Doped Manganites using Jahn-Teller Phonons
• Novel stripe-type charge ordering in the metallic A-type antiferromagnet Pr{0.5}Sr{0.5}MnO{3}
• Nanometer-sized Regions of Charge Ordering and Charge Melting in La2/3Ca1/3MnO3 Revealed by Electron Micro-diffraction
• Unveiling First Order CMR Transitions in the Two-Orbital Model for Manganites
• The Distinct Effects of Homogeneous Weak Disorder and Dilute Strong Scatterers on Phase Competetion in the Manganites
• Magnetic-field-induced collapse of charge-ordered nanoclusters and the Colossal Magnetoresistance effect in Nd(0.3)Sr(0.3)MnO(3)
• Domain Formation and Orbital Ordering Transition in a Doped Jahn-Teller Insulator
• Exploiting B Site Disorder for Phase Control in the Manganites
• Anti-Localisation to Strong Localisation: The Interplay of Magnetic Scattering and Structural Disorder
• Electronic and Magnetic Reconstructions in Manganite Superlattices
• Scaled frequency-dependent transport in the mesoscopically phase-separated colossal magnetoresistive manganite La_{0.625-y}Pr_yCa_{0.375}MnO_3
• Colossal magnetoresistance and quenched disorder in manganese oxides
• Quantum percolation and magnetic nano-dropletstates in electronically phase-separated manganite nanowires

Cited by in corpus (3)

• Antiferromagnetism beyond classical percolation threshold in the site-diluted half-filled one-band Hubbard model in three dimensions
• Collapse of ferromagnetism with Ti doping in Sm${}_{0.55}$Sr${}_{0.45}$MnO${}_3$: A combined experimental and theoretical study
• Designing multi-level resistance states for multi-bit storage using half doped manganites