HALL-EFFECT OF THE COLOSSAL MAGNETORESISTANCE MANGANITE LA1-XCAXMNO3

The Hall resistivity rho(H) and magnetoresistance of La1-xCaxMnO3 (T-c =265 K) have been measured at temperatures to 360 K in fields H to 14 T. By comparing rho(H) with the magnetization M, we have extracted the anomalous coefficient R-s. We uncover an interesting relationship: R- s is proportional to the zero-field resistivity from 200 to 360 K. Abo ve T-c, the Hall angle tan theta(H) similar to M. Further, the effecti ve Hall mobility is H independent over a wide range of H. We contrast these scaling relations with the Hall effect in typical ferromagnets. [S0163-1829(98)01618-X].