Thermal-expansion and magnetostriction anomalies in phase transitions in La1-xSrxMnO3

A study is reported on phase transitions in the La1- xSrxMnO3 system, both spontaneous and induced by a pulsed magnetic field of up to 250 kOe, accomp anied by anomalies in magnetoelastic properties. The temperatures of the po laron (charge) and magnetic ordering, as well as those of structural transi tions, are observed to be in good agreement with the results obtained by ot her methods. Jumps in the field dependence of longitudinal and transverse m agnetostriction associated with field-induced orbital ordering have been fo und. A strong temperature dependence of the corresponding threshold fields is observed. (C) 2000 MAIK "Nauka/Interperiodica".