Abstract
We present the results of the magnetic and electric transport measurements of TbBaCo2O5.5 single crystal in external magnetic fields. The measurements reveal five phase transitions: metal-insulator (MI), ferro- or ferrimagnetic (FM), antiferromagnetic (AFM), spin state ordering (SSO) and probably short range magnetic ordering of rare earth cations, at about TMI∼340 K, TC∼290 K, TN∼260 K, TSSO∼165 K and TR∼50 K, respectively. Note that the FM transition, which was clearly observed in magnetization measurements, does not exhibit itself in transport studies. It was found that only the Néel temperature TN can be sufficiently influenced by the magnetic field. The nature of the MI transition is discussed in connection with the possible Co3+ spin-state changes.
Original language | English |
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Pages (from-to) | e710-e712 |
Journal | Journal of Magnetism and Magnetic Materials |
Volume | 316 |
Issue number | 2 SPEC. ISS. |
DOIs | |
State | Published - Sep 2007 |
Externally published | Yes |
Funding
This work was supported by the Swiss National Science Foundation through the SCOPES Grant IB7320-110859/1 and the NCCR MaNEP project. Financial support by the Program of Basic Research at RAS “Quantum macrophysics” (Project no. 4 UB RAS) is acknowledged.
Keywords
- Cobalt oxides
- Magnetic phase transition
- Magnetotransport
- Metal-insulator phase transition