Anisotropic phonon conduction and lattice distortions in CMR-type bilayer manganite (La${}_{1-z}$Pr${}_z$)${}_{1.2}$Sr${}_{1.8}$Mn${}_2$O${}_7$ (z=0,0.2,0.4 and 0.6) single crystals

Abstract

We have undertaken a systematic study of thermal conductivity as a function of temperature and magnetic field of single crystals of the compound (La${}_{1-z}$Pr${}_z$)${}_{1.2}$Sr${}_{1.8}$Mn${}_2$O${}_7$ for $z$(Pr) =0.2,0.4. and 0.6. The lattice distortion due to Pr-substitution and anisotropic thermal conductivity in bilayer manganites are discussed on the basis of different relaxation models of local lattice distortions in metal and insulating states proposed by Maderda et al. The giant magnetothermal effect is scaled as a function of magnetization and discussed on the basis of a systematic variation of the occupation of the $e_g$-electron orbital states due to Pr-substitution.

7 pages, 6 figures, in press in Phys.Rev.B

References in corpus (4)

• Colossal Magnetoresistant Materials: The Key Role of Phase Separation
• Double Exchange Alone Does Not Explain the Resistivity of $L{a}_{1-x}S{r}_{x}Mn{O}_3$
• Dynamic Jahn-Teller Effect and Colossal Magnetoresistance in $L{a}_{1-x}{A}_{x}Mn{O}_3$
• Jahn-Teller effect and Electron correlation in manganites

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• Stretched exponential behavior in remanent lattice striction of a (La,Pr)${}_{1.2}$Sr${}_{1.8}$Mn${}_2$O${}_7$ bilayer manganite single crystal
• Magneto-optical investigation of the field-induced spin-glass insulator to ferromagnetic metallic transition of the bilayer manganite (La${}_{0.4}$Pr${}_{0.6}$)${}_{1.2}$Sr${}_{1.8}$Mn${}_2$O${}_7$
• Colossal electroresistance and colossal magnetoresistive step in paramagnetic insulating phase of single crystalline bilayered manganite(La${}_{0.4}$Pr${}_{0.6}$)${}_{1.2}$Sr${}_{1.8}$Mn${}_2$O${}_7$
• Anomalous pressure effect on the remanent lattice striction of a (La,Pr)${}_{1.2}$Sr${}_{1.8}$Mn${}_2$O${}_7$ bilayered manganite single crystal
• Electronic confinement and ordering instabilities in colossal magnetoresistive bilayer manganites
• Dynamics of the lattice and spins in the phase-separated manganite (Eu${}_{1-x}$Gd${}_x$)${}_{0.6}$Sr${}_{0.4}$MnO${}_3$