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Neutron diffraction study of crystal and magnetic structure of (La 0.7 Ca 0.3 ) 1– x Mn 1+ x O 3 ( x = 0, 0.1) systems
Author(s) -
Bażela W.,
Dyakonov V.,
Pashchenko V.,
Penc B.,
Szymczak H.,
HernandezVelasco J. H.,
Szytuła A.
Publication year - 2003
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200301703
Subject(s) - orthorhombic crystal system , antiferromagnetism , ferromagnetism , neutron diffraction , magnetic moment , crystallography , crystal structure , bond length , magnetic structure , materials science , condensed matter physics , molecular geometry , chemistry , magnetization , physics , magnetic field , molecule , organic chemistry , quantum mechanics
The evolution of crystal and magnetic structures of (La 0.7 Ca 0.3 ) 1– x Mn 1+ x O 3 ( x = 0, 0.1) as a function of temperature was determined. For both compounds the crystal structure is orthorhombic (space group Pnma) with the following sequence of the lattice constants: b /√2< a < c for x = 0 and c < a < b /√2 for x = 0.1. The para‐ferromagnetic transitions at T c = 265 K for x = 0 and 260 K for x = 0.1 are accompanied by structural distortions. For x = 0 the ferromagnetic ordering of the Mn moments equal to 3.57(10) μ B and parallel to the b‐axis is stable in the temperature range from 1.5 K to T c . For x = 0.1 at 1.5 K the magnetic order has two components: the ferromagnetic one with the magnetic moment μ = 3.46(12) μ B parallel to the b‐axis and the antiferromagnetic one with μ = 0.66(23) μ B parallel to the c‐axis. This order is stable up to T t = 45 K. Then the ferromagnetic order only exists up to T c = 260 K. These results correlate well with macroscopic magnetic data. At T c and T t the anomalies in the thermal dependence of Mn–O bond lengths and Mn–O–Mn bond angles are observed.