Spin state of Co3+ and magnetic transitions in RBaCo2O5.50 (R=Pr,Gd): Dependence on rare-earth size
Creators
- 1. Centro Atomico de Bariloche, 8400-San Carlos de Bariloche (Argentina)
- 2. European Synchrotron Radiation Facility, 6, Rue Jules Horowitz, F-38042 Grenoble Cedex 9 (France)
- 3. Departamento de Cristalografia y Mineralogia, Universidad de Malaga, 29071 Malaga (Spain)
- 4. Institut de Ciencia de Materials de Barcelona, CSIC, Campus Universitari de Bellaterra, E-08193 Bellaterra (Spain)
Description
We have studied the magnetic and structural properties of PrBaCo2O5.50 and GdBaCo2O5.50 using neutron and synchrotron techniques between 10 and 425 K. A unique structural transition has been detected in this temperature range. The changes observed in Co-O bond lengths across the metal-insulator transition confirm the spin state change of octahedral Co ions with R=Pr, the member of the RBaCo2O5.50 family with the largest R-ion (and R/Ba order). Magnetic structures have been thoroughly investigated. Different magnetic models previously reported for smaller lanthanides were checked against our data. We have found an evolution of the magnetic order, across the successive magnetic transitions, which can be interpreted on the basis of a hierarchical set of exchange interactions
Additional details
Identifiers
Publishing Information
- Journal Title
- Physical Review. B, Condensed Matter and Materials Physics
- Journal Volume
- 74
- Journal Issue
- 5
- Journal Page Range
- p. 054406-054406.11
- ISSN
- 1098-0121
INIS
- Country of Publication
- United States
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 38026471
- Subject category
- S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; S36: MATERIALS SCIENCE;
- Descriptors DEI
- BARIUM COMPOUNDS; BOND LENGTHS; CHEMICAL BONDS; COBALT IONS; COBALT OXIDES; ELECTRONS; EXCHANGE INTERACTIONS; GADOLINIUM COMPOUNDS; PHASE TRANSFORMATIONS; PRASEODYMIUM COMPOUNDS; SOLIDS; SPIN; TEMPERATURE DEPENDENCE
- Descriptors DEC
- ALKALINE EARTH METAL COMPOUNDS; ANGULAR MOMENTUM; CHALCOGENIDES; CHARGED PARTICLES; COBALT COMPOUNDS; DIMENSIONS; ELEMENTARY PARTICLES; FERMIONS; INTERACTIONS; IONS; LENGTH; LEPTONS; OXIDES; OXYGEN COMPOUNDS; PARTICLE PROPERTIES; RARE EARTH COMPOUNDS; TRANSITION ELEMENT COMPOUNDS
Optional Information
- Notes
- (c) 2006 The American Physical Society