Belik Alexei A, Takayama-Muromachi Eiji
Advanced Nano Materials Laboratory (ANML), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
Inorg Chem. 2006 Dec 11;45(25):10224-9. doi: 10.1021/ic061400b.
Magnetic and specific heat measurements were performed in a single-phased powder BiMnO3 sample prepared at 6 GPa and 1383 K. The imaginary part of the ac susceptibilities showed strong frequency dependence below the ferromagnetic Curie temperature of 98 K. The relaxation measurements revealed time-dependent magnetic properties below 98 K. These data indicate the appearance of a "spin-glass-like" state in BiMnO3. Specific heat measurements showed the existence of ferromagnetic spin waves. However, no simple term Cm [directly proportional] T3/2 was found indicating an unconventional behavior of the magnetic specific heat. The Debye temperature was estimated to be 410 K using isostructural compounds BiScO3 and BiCrO3.
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