Heat Conduction and Magnetic Phase Behavior in Electron-Doped Ca_{1-x} La_x MnO_3(0 <= x <= 0.2)

Abstract

Measurements of thermal conductivity (kappa) vs temperature are reported for a series of Ca_{1-x} La_x MnO_3(0 <= x <= 0.2) specimens. For the undoped (x=0), G-type antiferromagnetic compound a large enhancement of kappa below the Neel temperature (T_N ~ 125 K) indicates a strong coupling of heat-carrying phonons to the spin system. This enhancement exhibits a nonmonotonic behavior with increasing x and correlates remarkably well with the small ferromagnetic component of the magnetization reported previously [Neumeier and Cohn, Phys. Rev. B 61 14319 (2000).] Magnetoelastic polaron formation appears to underly the behavior of kappa and the magnetization at x <= 0.02.

submitted to PRB; 4 pp., 4 Fig.'s, RevTex4

References in corpus (2)

• Colossal Magnetoresistant Materials: The Key Role of Phase Separation
• Spin versus Lattice Polaron: Prediction for Electron-Doped CaMnO3

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• Spin-polaron formation and magnetic state diagram in La doped $CaMn{O}_3$