Bilayer splitting and c-axis coupling in bilayer manganites showing colossal magnetoresistance.
By performing angle-resolved photoemission spectroscopy of the bilayer colossal magnetoresistive (CMR) manganite, La{sub 2-2x}Sr{sub 1+2x}Mn{sub 2}O{sub 7}, we provide the complete mapping of the Fermi-level spectral weight topology. Clear and unambiguous bilayer splitting of the in-plane 3d{sub x{sup 2}-y{sup 2}} band, mapped throughout the Brillouin zone, and the full mapping of the 3d{sub 3z{sup 2}-r{sup 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.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 1000672
- Report Number(s):
- ANL/MSD/JA-68554; TRN: US201101%%455
- Journal Information:
- Phys. Rev. B, Vol. 80, Issue Dec. 7, 2009
- Country of Publication:
- United States
- Language:
- ENGLISH
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