Published September 21, 2005
| Version v1
Journal article
Oxygen isotope effect on metal-insulator transition in layered cobaltites RBaCo2O5.5 (R = Pr, Dy, Ho and Y)
- 1. Laboratory for Developments and Methods, Paul Scherrer Institut, CH-5232 Villigen PSI (Switzerland)
- 2. Laboratory for Neutron Scattering, ETH Zuerich and Paul Scherrer Institut, CH-5232 Villigen PSI (Switzerland)
Description
Both differential scanning calorimetry and powder neutron diffraction have been applied to investigate an oxygen isotope effect on the metal-insulator (MI) transition in layered cobaltites RBaCo2O5.5 (R = Pr, Dy, Ho and Y). For all the compounds it was found that 18O substitution increases the transition temperature TMI by about 2 K. A small negative isotope-effect coefficient α0∼-0.06 indicates that a delocalization of the pd σ holes in the Co3+ high spin state (rather than a spin-state transition) can be responsible for the MI transition, in agreement with density-functional calculations (Wu 2003 J. Phys.: Condens. Matter 15 503)
Availability note (English)
Available online at http://stacks.iop.org/0953-8984/17/5813/cm5_37_016.pdf or at the Web site for the Journal of Physics. Condensed Matter (ISSN 1361-648X) http://www.iop.org/Additional details
Identifiers
- URL
- http://stacks.iop.org/0953-8984/17/5813/cm5_37_016.pdf; http://www.iop.org/;
- DOI
- 10.1088/0953-8984/17/37/016;
- PII
- S0953-8984(05)02267-8;
Publishing Information
- Journal Title
- Journal of Physics. Condensed Matter
- Journal Volume
- 17
- Journal Issue
- 37
- Journal Page Range
- p. 5813-5820
- ISSN
- 0953-8984
- CODEN
- JCOMEL
INIS
- Country of Publication
- United Kingdom
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 36105738
- Subject category
- S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
- Descriptors DEI
- BARIUM COMPOUNDS; CALORIMETRY; COBALT IONS; COBALT OXIDES; DENSITY FUNCTIONAL METHOD; DYSPROSIUM COMPOUNDS; HIGH SPIN STATES; HOLES; HOLMIUM COMPOUNDS; ISOTOPE EFFECTS; NEUTRON DIFFRACTION; OXYGEN 18; POWDERS; PRASEODYMIUM COMPOUNDS; SPIN; TRANSITION TEMPERATURE; YTTRIUM COMPOUNDS
- Descriptors DEC
- ALKALINE EARTH METAL COMPOUNDS; ANGULAR MOMENTUM; CALCULATION METHODS; CHALCOGENIDES; CHARGED PARTICLES; COBALT COMPOUNDS; COHERENT SCATTERING; DIFFRACTION; ENERGY LEVELS; EVEN-EVEN NUCLEI; IONS; ISOTOPES; LIGHT NUCLEI; NUCLEI; OXIDES; OXYGEN COMPOUNDS; OXYGEN ISOTOPES; PARTICLE PROPERTIES; PHYSICAL PROPERTIES; RARE EARTH COMPOUNDS; SCATTERING; STABLE ISOTOPES; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT COMPOUNDS; VARIATIONAL METHODS