55Mn NMR in Ferromagnetic Double Perovskites La1-xBixmn0.5Ni0.5O3

The hyperfine magnetic field HHF at 55Mn in ferromagnetically ordered double perovskites La1-xBixMn0.5Ni0.5O3 with 0≤x≤0.9 were investigated by NMR at 1.8 K. HHF decreases with increasing Bi content x from -258 kOe at x=0 to approximately -280 kOe at x=0.9, which is attributed to a reduction in the...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2009-11, Vol.78 (11)
Main Authors: ASAI, Kichizo, KAWAKAMI, Takafumi, ENOSHITA, Shumpei, SHIOZAWA, Masanori, KOBAYASHI, Yoshihiko
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Magnetic resonances and relaxations in condensed matter, mössbauer effect
Nuclear magnetic resonance and relaxation
Physics
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Summary:The hyperfine magnetic field HHF at 55Mn in ferromagnetically ordered double perovskites La1-xBixMn0.5Ni0.5O3 with 0≤x≤0.9 were investigated by NMR at 1.8 K. HHF decreases with increasing Bi content x from -258 kOe at x=0 to approximately -280 kOe at x=0.9, which is attributed to a reduction in the positive supertransferred hyperfine magnetic field, HSTHF, from neighboring Ni2+ ions. The reduction in HSTHF caused by the Bi substitution suggests that the covalent character of Ni2+-O2--Mn4+ bonds decreases in competition with that of Bi3+-O2- bonds. The decrease in the ferromagnetic Curie temperature of the present system with increasing x is quantitatively interpreted with the decreasing covalent character of Ni2+-O2--Mn4+ bonds.
ISSN:0031-9015
1347-4073