Pressure effect on manganites with layered perovskite structure
- Event time: 1:00pm
- Event date: 25th February 2002
- Speaker: Dmitriy Sokolov (University of Edinburgh)
- Location: Room 2511, James Clerk Maxwell Building (JCMB) James Clerk Maxwell Building Peter Guthrie Tait Road Edinburgh EH9 3FD GB
The colossal magnetoresistance (CMR) observed in several manganese oxides has recently attracted considerable attention from both academic and technological viewpoints. The colossal magnetoresistance materials are compounds based on the ABO3 perovskite structure. The most commonly widely studied family has the chemical formula Re1-xAxMnO3 (where Re is a rare earth such as La or Pr, and A is a divalent alkali such as Sr or Ca), but there is also growing interest in the "Ruddlesden-Popper" series of layered materials Rex+1MnxO3x+1. The layered compounds consist of the double-layered MnO2 planes and the intervening insulating planes stacked along the c-axis. We have been studying the effect of pressure on transport and magnetic properties of Rex+1MnxO3x+1 (x=2). We have shown that the applied hydrostatic pressure suppresses the steep drop of the resistivity of the La1.4Sr1.6Mn2O7 and preserves the two-dimensional charge and spin dynamics down to low temperatures. The pressure will be shown as a powerful tool for studying electronic and magnetic properties of manganites with layered perovskite structure.
This is a weekly series of informal talks given primarily by members of the soft condensed matter and statistical mechanics groups, but is also open to members of other groups and external visitors. The aim of the series is to promote discussion and learning of various topics at a level suitable to the broad background of the group. Everyone is welcome to attend..