Simultaneous valence shift of Pr and Tb ions at the spin-state transition in (Pr1-yTby)0.7Ca0.3CoO3.
Result description
Temperature dependence of the x-ray absorption near-edge structure (XANES) spectra at the Pr L3 and Tb L3 edges was measured for the (Pr1-yTby )0.7Ca0.3CoO3 system, in which a sharp spin-state (SS) transition took place at a critical temperature TSS. A small increase in the valence of the terbium ion was found below TSS, besides the enhancement of the praseodymium valence; the trivalent states, which are stable at room temperature, change to a 3+/4+ ionic mixture at low temperatures. In particular for the y = 0.2 sample, the average valence determined at 8 K amounts to 3.25+ and 3.03+ for the Pr and Tb ion, respectively.
Keywords
metal-insulator transitions and other electronic transitionsX-ray absorption spectraspin crossover
The result's identifiers
Result code in IS VaVaI
Result on the web
DOI - Digital Object Identifier
Alternative languages
Result language
angličtina
Original language name
Simultaneous valence shift of Pr and Tb ions at the spin-state transition in (Pr1-yTby)0.7Ca0.3CoO3.
Original language description
Temperature dependence of the x-ray absorption near-edge structure (XANES) spectra at the Pr L3 and Tb L3 edges was measured for the (Pr1-yTby )0.7Ca0.3CoO3 system, in which a sharp spin-state (SS) transition took place at a critical temperature TSS. A small increase in the valence of the terbium ion was found below TSS, besides the enhancement of the praseodymium valence; the trivalent states, which are stable at room temperature, change to a 3+/4+ ionic mixture at low temperatures. In particular for the y = 0.2 sample, the average valence determined at 8 K amounts to 3.25+ and 3.03+ for the Pr and Tb ion, respectively.
Czech name
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Czech description
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Classification
Type
Jx - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BE - Theoretical physics
OECD FORD branch
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Result continuities
Project
GAP204/11/0713: Charge transfer between the transition metal and rare earth ions in perovskites
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2013
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physical Review. B
ISSN
1098-0121
e-ISSN
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Volume of the periodical
87
Issue of the periodical within the volume
15
Country of publishing house
US - UNITED STATES
Number of pages
7
Pages from-to
"155153-1"-"155153-7"
UT code for WoS article
000318513800005
EID of the result in the Scopus database
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Result type
Jx - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP
BE - Theoretical physics
Year of implementation
2013