The transport and magnetic properties of single crystals of La1-xCaxMnO3 (x=0.2, 0.3) have been investigated. The transport and magnetization results of the ferromagnetic insulator, La0.8Ca0.2MnO3, are quite different from those of La0.7Ca0.3MnO3 that falls into a ferromagnetic metal. We have found that the paramagnetic to ferromagnetic transitions observed in La0.8Ca0.2MnO3 and La0.7Ca0.3MnO3 are second and first order using the Banerjee criterion, respectively. The observation of magnetic frustration and Heisenberg exponents derived by the modified Arrott plot favors the existence of short-range charge/orbital ordering in La0.8Ca0.2MnO3 and even in La0.7Ca0.3MnO3.
|Number of pages||4|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2001|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics