Oxygen isotope effect on metal-insulator transition in layered cobaltites RBaCo2O5.5 (R = Pr, Dy, Ho and Y)

K. Conder, E. Pomjakushina, V. Pomjakushin, M. Stingaciu, S. Streule, A. Podlesnyak

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

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).

Original languageEnglish
Pages (from-to)5813-5820
Number of pages8
JournalJournal of Physics Condensed Matter
Volume17
Issue number37
DOIs
StatePublished - Sep 21 2005
Externally publishedYes

Fingerprint

Dive into the research topics of 'Oxygen isotope effect on metal-insulator transition in layered cobaltites RBaCo2O5.5 (R = Pr, Dy, Ho and Y)'. Together they form a unique fingerprint.

Cite this