Bilayer splitting and c-axis coupling in bilayer manganites showing colossal magnetoresistance

Details Bilayer splitting and c-axis coupling in bilayer manganites showing colossal magnetoresistance Bilayer splitting and c-axis coupling in bilayer manganites showing colossal magnetoresistance

2008-06-12

arxiv.org/abs/0806.2120v2

Physical Review B, 80, 235111 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 6 figures

Scientific paper

10.1103/PhysRevB.80.235111

By performing angle-resolved photoemission spectroscopy of the bilayer colossal magnetoresistive (CMR) manganite, $La_{2-2x}Sr_{1+2x}Mn_{2}O_{7}$, we provide the complete mapping of the Fermi level spectral weight topology. Clear and unambiguous bilayer splitting of the in-plane 3d$_{x^2-y^2}$ band, mapped throughout the Brillouin zone, and the full mapping of the 3d$_{3z^2-r^2}$ band are reported. Peculiar doping and temperature dependencies of these bands imply that as transition from the ferromagnetic metallic phase approaches, either as a function of doping or temperature, coherence along the c-axis between planes within the bilayer is lost, resulting in reduced interplane coupling. These results suggest that interplane coupling plays a large role in the CMR transition.

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