Dependence of the physical properties of Nd0.5Ca0.5MnO3+delta on the oxidation state of Mn

Citation
C. Frontera et al., Dependence of the physical properties of Nd0.5Ca0.5MnO3+delta on the oxidation state of Mn, PHYS REV B, 62(5), 2000, pp. 3002-3005
Citations number
15
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B
ISSN journal
01631829 → ACNP
Volume
62
Issue
5
Year of publication
2000
Pages
3002 - 3005
Database
ISI
SICI code
0163-1829(20000801)62:5<3002:DOTPPO>2.0.ZU;2-I
Abstract
We present a comparative study of the magnetic, transport, and structural p roperties of Nd0.5Ca0.5MnO3+delta [delta=0.02(1) and 0.04(1)]. We have foun d significant differences between the low-temperature magnetic order and ma gnetization below T(CO)approximate to 250 K of the two samples. In particul ar, one component of the magnetic moment presents a ferromagnetic coupling between the (001) planes (Pbnm setting) changing the angle between neighbor ing Mn ions from 180 degrees (perfect charge-exchange-type order) to 150 de grees[delta=0.02(1)1 and 130 degrees[delta=0.04(1)]. These results imply a remarkable delta dependence that is discussed in the light of a nonrandom s patial distribution of defects in the perfect charge order scheme.