THE STATIC AND DYNAMIC LATTICE EFFECTS IN LA1-XCAXMNO3

The structural and magnetic behavior of the perovskite insulator La0.9 Ca0.1MnO3 were studied as a function of temperature from 15 to 300 K b y neutron powder diffraction. Although this compound shows an anomalou s response of the lattice parameters around T-c (150 K), the behavior of the oxygen/manganese Debye-Waller factors is in clear contrast to i ts ''colossal magnetoresistance'' (CMR) counterpart La0.65Ca0.35MnO3 W e speculate that the difference is intimately associated with the meta l-insulator transition in the latter compound. Copyright (C) 1996 Else vier Science Ltd