Observation of 3D Heisenberg-like ferromagnetism in single crystal La_{0.875}Sr_{0.125}MnO_3

Abstract

We report measurements and analysis of the magnetic critical phenomena in a single crystal of La${}_{0.875}$Sr${}_{0.125}$MnO${}_3$. The critical exponents associated with the ferromagnetic transition have been determined from ac susceptibility and dc magnetisation data. Techniques like the Kouvel$-$Fischer plots, modified Arrots Plots and the critical isotherm analysis were used for this purpose. The values of the the exponents $\gamma$, $\beta$ and $\delta$ obtained are found to match very well with those predicted for the 3D Heisenberg model. Our results are consistent with recent numerical calculations and suggest that though the double exchange interaction is driven by the motion of conduction electrons, the effective magnetic interaction near the transition is renormalized to a short range one.

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References in corpus (7)

• Colossal Magnetoresistant Materials: The Key Role of Phase Separation
• Critical Phenomena and Renormalization-Group Theory
• Critical Phenomena of Ferromagnetic Transition in Double-Exchange Systems
• Critical Temperature of Ferromagnetic Transition in Three-Dimensional Double-Exchange Models
• Hybrid Monte Carlo algorithm for the Double Exchange Model
• Determination of the magnetization scaling exponent for single crystal La${}_{0.8}$Sr${}_{0.2}$MnO${}_3$ by broadband microwave surface impedance measurements
• A Monte Carlo Method for Fermion Systems Coupled with Classical Degrees of Freedom

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• Strain Fields and Critical Phenomena in Manganites I: Spin-Lattice Hamiltonians