Magnetic properties of the layered cobaltite

✍ Scribed by A. Jarry; H. Luetkens; Y.G. Pashkevich; M. Stingaciu; E. Pomjakushina; K. Conder; P. Lemmens; H.-H. Klaus

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 810 KB
• Volume: 404
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2008.11.178

✦ Synopsis

We present a DC magnetization, zero and longitudinal field mSR 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 ¼ 290ð5Þ K, then to an antiferromagnetic (AF1) phase at T N1 ¼ 265ð5Þ K, and to another AF (AF2) phase at T N2 ¼ 160ð10Þ K. Even though the transition temperatures are similar to the ones of RBaCo 2 O 5:5 with R ¼ 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 mSR 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.