Bilayer splitting and c-axis coupling in CMR bilayer manganites
By performing angle-resolved photoemission spectroscopy of the bilayer colossal magnetoresistive (CMR) manganite, La2-2xSr1+2xMn2O7, we provide the complete mapping of the Fermi-level spectral weight topology. Clear and unambiguous bilayer splitting of the in-plane 3dx2-y2 band, mapped throughout the Brillouin zone, and the full mapping of the 3d3z2-r2 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:
- Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
- Sponsoring Organization:
- Advanced Light Source Division; Materials Sciences Division
- DOE Contract Number:
- AC02-05CH11231
- OSTI ID:
- 980910
- Report Number(s):
- LBNL-2947E
- Journal Information:
- Physical Review B, Journal Name: Physical Review B Journal Issue: 23 Vol. 80; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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