Magnetic and Mössbauer studies of 5% Fe-doped BiMnO3 |
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| Authors: | Alexei A Belik Naoaki Hayashi Masaki Azuma Shigetoshi Muranaka Mikio Takano Eiji Takayama-Muromachi |
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| Institution: | aAdvanced Nano Materials Laboratory (ANML), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan;bGraduate School of Human and Environmental Studies, Kyoto University, Kyoto 606-8501, Japan;cInstitute for Chemical Research, Kyoto University, Uji, Kyoto-fu 611-0011, Japan |
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| Abstract: | 57Fe Mössbauer spectroscopy, dc and ac magnetization, specific heat, and differential scanning calorimetry measurements were performed in a powder BiMn0.95Fe0.05O3 sample prepared at 6 GPa and 1383 K. The substitution of 5% Fe for Mn increases the temperatures of the structural monoclinic-to-orthorhombic phase transition (from 768 to 779 K) and the ferromagnetic transition (from 98 to 109 K) by about 10 K in BiMn0.95Fe0.05O3 compared with BiMnO3. On the other hand, the temperature of the monoclinic-to-monoclinic phase transition associated with the orbital ordering strongly decreases in BiMn0.95Fe0.05O3 (414 K) compared with that of BiMnO3 (474 K). The saturated magnetic moment at 5 K and 5 T is also suppressed from 3.92 μB per formula unit in BiMnO3 to 3.35 μB in BiMn0.95Fe0.05O3. The large quadrupole splitting (1.18 mm/s) observed at 293 K in BiMn0.95Fe0.05O3 can be explained by the strong Jahn-Teller distortion and cooperative orbital order. The quadrupole splitting reduces by two times above the orbital melting temperature. |
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| Keywords: | Multiferroics Fe-doped BiMnO3 Mö ssbauer spectroscopy Magnetic susceptibility |
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