Small-Angle Neutron Scattering Study on Ferromagnetic Correlation in (La,Tb)_<2/3>Ca_<1/3>MnO_3 : Condensed Matter: Electronic Properties, etc.

概要

論文の詳細を見る
In order to make clear a correlation between mesoscopic ferromagnetic cluster and the colossal magnetoresistance in perovskite based manganites, the systems (La_<1-x>Tb_x)_<2/3>Ca_<1/3>MnO_3 with x = 0.1 and 0.3 have been studied by small-angle neutron scattering technique. We investigated the property of mesoscopic ferromagnetic (short range ordered) cluster under the various magnetic fields and temperatures. In the sample of x = 0.3, a large number of short range ordered cluster is created below T = 150 K and persists in the two-phase coexistence state down to 8 K. The short range ordered clusters merge into single ferromagnetic domains with applying magnetic field of H = 5 T, resulting in the drop of resistivity of the order of 10^4. According to our model calculation, we found that roughly 50% of the system remained short range ordered phase at T = 8 K and H = 0 T. The fractional volume of the short range order phase decreased to 18% with applying magnetic field up to H = 1 T.
社団法人日本物理学会の論文
2001-04-15