{sup 55}Mn nuclear magnetic resonance study of highly Sr-doped La{sub 2-2x}Sr{sub 1+2x}Mn{sub 2}O{sub 7} (x = 0.5-0.8).
The {sup 55}Mn nuclear magnetic resonance (NMR) study of bilayered perovskites La{sub 2-2x}Sr{sub 1+2x}Mn{sub 2}O{sub 7} with 0.5 {le} x {le} 1 is presented. The {sup 55}Mn spin-echo spectra were measured at 4.2 K at zero applied magnetic field and at fields up to 2.5 T. Recent neutron-diffraction studies report that all the compounds studied are antiferromagnetically ordered (except x=0.68 in which no long-range magnetic order was found) [Mitchell et al., J. Phys. Chem. B 105, 10731 (2001)]. However, within the doping range 0.62 {le} x {le} 0.68, apart from NMR signal from antiferromagnetic insulating (AFI) phase, also lines from ferromagnetic insulating (FMI) and ferromagnetic metallic (FMM) phases are observed. This indicates that phase separation occurs in high Sr-doped bilayered manganites. The amount of the FMI and FMM regions decreases with the Sr doping level and for compounds with x=0.75 and x=0.8; only the line originating from nuclei in Mn{sup 4+} cations in AFI regions is observed.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- SC; EU grant; Grant agency of the Czech Republic; Polish Ministry of Science and Higher Education
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 944528
- Report Number(s):
- ANL/MSD/JA-63078
- Journal Information:
- Phys. Rev. B, Journal Name: Phys. Rev. B Journal Issue: 2008 Vol. 78; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- ENGLISH
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