Dynamics of phase transitions in La1-xSrxCoO3

作者：Louca D^*

来源：Physica B: Condensed Matter , 2003, 329: 835-836.

DOI：10.1016/S0921-4526(02)02535-8

• Jahn-Teller
• lattice dynamics
• local structure
• neutron diffraction

The unique spin transitions present in lanthanum cobaltate subject the system to variable spin-lattice coupling and to a potentially new mechanism for the insulator metal transition. The transitions occur with increasing temperature and carrier concentration from low spin (non-magnetic) to either a high-spin or an intermediate-spin (IS) (both magnetic) configurations where the IS state is Jahn-Teller active. Earlier studies of the local structure provided strong evidence for the presence of localized lattice distortions associated with a Jahn-Teller active mode with Sr doping. Recent measurements of the dynamic structure function couple the local effects to changes in lattice dynamics with temperature and composition and provide a time-scale for the atomic fluctuations.

• 出版日期2003-5