Nuclear Magnetic Resonances of Mo^<95>, Mo^<97> and Fe^<57> in Ba_2(FeMo)O_6, Sr_2(FeMo)O_6 and Ca_2(FeMo)O_6

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Nuclear magnetic resonances of Mo^<95>, Mo^<97> and Fe^<57> in Ba_2(FeMo)O_6, Sr_2(FeMo)O_6 and Ca_2(FeMo)O_6 with ordered perovskite structure were studied in their ferromagnetic state by spin echo method. The Mo^<95> and Mo^<97> spin echo signals at 4.2°K were observed between 33.0 MHz to 65.6 MHz, 30.5 MHz to 81.2 MHz and 31.5 MHz to 79.6 MHz, respectively. The Mo^<95> spin echo peak frequencies of these compounds (54.4 MHz, 67.6 MHz and 63.4 MHz, respectively) are higher in the compound with higher ferromagnetic Neel temperature. In Ba_2(FeMo)O_6, the Mo^<95> spin echo peak shifts to higher frequencies with increasing external static magnetic field. The measured hyperfine fields of the Mo^<5+> ions in these compounds are far smaller than the value of the orbital hyperfine field which is expected when the magnitude of the effective orbital angular momentum is 1. The Fe^<57> spin echo signal in Ba_2(FeMo)O_6 at 4.2°K was found at 79 MHz.
社団法人日本物理学会の論文
1970-05-05