Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-12-15
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 4 figures, to be published in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.96.037202
$^{139}$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$_6$\@.
Kawasaki Yasuhiro
Kishimoto Yasuaki
Kubo Harunobu
Minami Tomoharu
Nakajima Tatsuya
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