
TY  - JOUR
A1  - Muroi, Michihito 
A1  - Street, Robert 
T1  - Evolution of Ferromagnetism in LaMnO<emph tye="8">3+&#948;</emph>
JF  - Australian Journal of Physics
JO  - Aust. J.  Phys.
Y1  - 1999
VL  - 52
IS  - 2
SP  - 205
EP  - 225
KW  - 
UR  - https://doi.org/10.1071/P98059 
N2  - An extensive study has been made of the magnetic properties of LaMnO3+&#948; with finely tuned hole concentrations, x (=2&#948;), ranging between 0&#183;08 and 0&#183;15. As x increases in the range studied, the spontaneous magnetisation at low temperature increases from only about 20% to almost 100% of the value for full polarisation of Mn spins, and the coercivity Hc decreases by more than an order of magnitude, e.g. from 4&#183;2 kOe to 120 Oe at 5 K. The magnetic ordering temperature Tc takes a minimum at x = xc ~ 0&#183;12. For x &#60; xc, the inverse susceptibility shows a marked decrease as Tc is approached from above. Measurements of minor hysteresis loops for the sample with x = 0&#183;08 show that magnetisation is reversible with respect to field changes except near Hc. These observations are discussed in terms of a two-phase exchange coupling (TPEC) model in which it is assumed that at low temperature the system separates into two phases, a hole-free antiferromagnetic phase and an optimally doped ferromagnetic phase, and the two phases are coupled through superexchange interactions at the interface. 
ER  -

