Phase Separation in A-site Ordered Perovskite Manganite LaBaMn${}_2$O${}_6$ Probed by ${}^{139}$La and ${}^{55}$Mn NMR

Abstract

${}^{139}$La- and ${}^{55}$Mn-NMR spectra demonstrate that the ground state of the A-site ordered perovskite manganite LaBaMn${}_2$O${}_6$ is a spatial mixture of the ferromagnetic (FM) and antiferromagnetic (AFI(CE)) regions, which are assigned to the metallic and the insulating charge ordered state, respectively. This exotic coexisting state appears below 200 K via a first-order-like formation of the AFI(CE) state inside the FM one. Mn spin-spin relaxation rate indicates that the FM region coexisting with the AFI(CE) one in LaBaMn${}_2$O${}_6$ is identical to the bulk FM phase of the disordered form La${}_{0.5}$Ba${}_{0.5}$MnO${}_3$ in spite of the absence of A-site disorder. This suggests mesoscopic rather than nanoscopic nature of FM region in LaBaMn${}_2$O${}_6$\@.

arXiv comment4 pages, 4 figures, to be published in Phys. Rev. Lett

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• Double Exchange Alone Does Not Explain the Resistivity of $L{a}_{1-x}S{r}_{x}Mn{O}_3$
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• muSR Investigation of magnetically ordered states in A-site ordered perovskite manganites RBaMn2O6 (R = Y and La)
• Interplay between different states in heavy fermion physics