1. Enhancement of ferromagnetic cluster induced by magnetic field in the phase-separated La 0.5 Ca 0.5 MnO 3
- Author
-
Li Run-wei, Chen Xin, Zhang Shao-Ying, Shen Bao-Gen, Sun Ji-Rong, and Wang Zhi-Hong
- Subjects
Magnetization ,Charge ordering ,Materials science ,Magnetic domain ,Condensed matter physics ,Magnetoresistance ,Ferromagnetism ,Phase (matter) ,Transition temperature ,General Physics and Astronomy ,Magnetic field - Abstract
Magnetic and transport properties of La0.5Ca0.5MnO3 have been investigated by measuring the magnetization and resistance in zero-field-cooled (ZFC) and held-cooled (FG) modes. Conspicuously irreversible behaviors of magnetization/resistance in the two different modes were observed below the charge ordering transition temperature (T-CO) The ZFG and FC magnetizations at 5K, as functions of the magnetic field, coincide for mu(0)H less than or equal to 1T Afterwards, the ZFC magnetization tends to an approximate constant, but the FC one increases linearly with increasing field. There exists an excellent correspondence between magnetization and resistance below T-CO All the results suggest that the ferromagnetic clusters embed in the charge-ordered matrix. The phenomenon of ferromagnetic clusters growing up easily in the FC procedure has been interpreted according to the model of thermally activated two-level system.
- Published
- 2000