HALL MEASUREMENTS ON LA2 3CA1/3MNO3-DELTA AND ND2/3SR1/3MNO3-DELTA - A COMPARATIVE-STUDY/

The Hall resistivity of epitaxial La2/3Ca1/3MnO3-delta 1 and bulk Nd2/ 3Sr1/3MnO3-delta 2 separates into a normal and an anomalous part. The anomalous Hall resistivity correlates with magnetisation data while th e normal part suggests the use of a two-band model for these perovskit es. Single carrier concentrations and mobilities are p less than or eq ual to 0.75 x 10(21) cm(-3) (4.2 K, Nd-Sr) and p less than or equal to 6.4 x 10(22) cm(-3) (4.2 K, La-Ca) and then mobilities at 4.2 K, B = 0 are mu(p) greater than or equal to 1.03 cm(2)/(V s) (Nd-Sr) or great er than or equal to 0.44 cm(2)/(V s) (La-Ca). (C) 1998 Elsevier Scienc e B.V. All rights reserved.