Abstract
Abstract We present a DC magnetization, zero and longitudinal field μ SR investigation on the magnetic properties of NdBaCo 2 O 5.50 . It was found that NdBaCo 2 O 5.50 exhibits successive magnetic transitions from a high temperature paramagnetic phase to a ferromagnetic (FM) phase at T C = 290 ( 5 ) K , then to an antiferromagnetic (AF1) phase at T N 1 = 265 ( 5 ) K , and to another AF (AF2) phase at T N 2 = 160 ( 10 ) K . Even though the transition temperatures are similar to the ones of RBaCo 2 O 5.5 with R = Ho , Y, Dy, Tb, the microscopic magnetic nature of NdBaCo 2 O 5.50 is very different from the other compounds. That is, the FM phase is characterized by a temperature dependent mixture of dynamic and static phase volumes. The observed μ SR frequencies indicate that in the AFM phases different spin state ordered (SSO) magnetic structures are present in NdBaCo 2 O 5.50 than in the compounds with other rare earth ions.
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