Observation of Ferromagnetic Clusters in Bi0.125Ca0.875MnO3
Yuhai Qin, Trevor A. Tyson, Klaus Pranzas, Helmut Eckerlebe
TL;DR
This study uses neutron scattering to reveal ferromagnetic clusters forming in Bi0.125Ca0.875MnO3 below 108K, explaining its large bulk magnetization through temperature and magnetic field effects.
Contribution
First direct observation of ferromagnetic clusters in Bi0.125Ca0.875MnO3 using neutron scattering, clarifying the magnetic structure and origin of magnetization.
Findings
Ferromagnetic clusters form below Tc~108K.
Cluster size and number increase with decreasing temperature.
Magnetization is enhanced by external magnetic fields.
Abstract
The electron doped manganite system, Bi0.125Ca0.875MnO3, exhibits large bulk magnetization of unknown origin. To select amongst possible magnetic ordering models, we have conducted temperature and magnetic field dependent small-angle neutron scattering measurements. Nontrivial spin structure has been revealed. Ferromagnetic spin clusters form in the antiferromagnetic background when temperature is decreased to Tc~108K. With a further reduction in temperature or the application of external magnetic field, the clusters begin to form in larger numbers, which gives an overall enhancement of magnetization below Tc.
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