STRUCTURAL PHASE-TRANSITION AT LOW-TEMPERATURE, CORRESPONDING TO CHARGE ORDERING IN THE CMR PEROVSKITES LN(0.5)A(0.5)MNO(3)

Authors
LAFFEZ P VANTENDELOO G MILLANGE F CAIGNAERT V HERVIEU M RAVEAU B
Citation
P. Laffez et al., STRUCTURAL PHASE-TRANSITION AT LOW-TEMPERATURE, CORRESPONDING TO CHARGE ORDERING IN THE CMR PEROVSKITES LN(0.5)A(0.5)MNO(3), Materials research bulletin, 31(8), 1996, pp. 905-911
Citations number
22
Categorie Soggetti
Material Science
Journal title
Materials research bulletin → ACNP
ISSN journal
00255408
Volume
31
Issue
8
Year of publication
1996
Pages
905 - 911
Database
ISI
SICI code
0025-5408(1996)31:8<905:SPALCT>2.0.ZU;2-T
Abstract
The magneto resistive perovskites Nd0.5Sr0.5MnO3 and Pr0.5Sr0.41Ca0.09 MnO3 undergo a transition from anti ferromagnetic insulator to ferroma gnetic metal as function of temperature. The room temperature phase is orthorhombic with the space group Imma and the cell parameters a appr oximate to root 2a(p), b approximate to 2a(p), and c approximate to ro ot 2a(p). A structural phase transition related to charge ordering acc ompanying the transition from ferromagnetic state to antiferromagnetic state has been evidenced by low temperature electron diffraction. Thi s transition is reversible and a new superstructure, with a P-type ort horhombic cell. and lattice parameters parameters a approximate to 2 r oot 2a(p), b approximate to 2a(p), and c approximate to root 2a(p), is formed.