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Magneto-transport mechanisms in layered perovskites

Project leaders: PD Dr. Steffen Wirth (MPI CPfS Dresden)
Dr. Suja Elisabeth (IISc Bangalore)
Funding period:June 2009 - June 2011

Strongly correlated transition metal oxides with perovskite-like structure exhibit a host of physical phenomena like metal insulator transition, superconductivity, magnetic transition and charge/orbital ordering. The main objective of this proposal is to investigate (1) the relevance of the electronic phase separation to the magneto-transport mechanisms and investigations of charge ordering in perovskite single crystals and (2) to explore the phase separation scenario in the ordered double perovskites of the type A2BB'O6 (A = alkaline earth ion, B and B' = transition metal ion). Scanning tunneling microscopy/ spectroscopy (STM/S) will be employed to investigate the phase separation. STS is a powerful tool to probe quasi-particle density of states (DOS) on an atomic scale with spatial resolution. These experiments should be performed using good quality single crystals, preferably on the in situ cleaved surfaces in order to distinguish between chemical inhomogeneity and electronic phase separations.

It is proposed to grow single crystals of these multi-valent perovskites in the crystal growth laboratory of Indian Institute of Science (IISc) by the Indian investigator and the associated research team. The single crystals will be grown using flux method or float zone technique. After preliminary characterization at IISc, these crystals will be investigated in detail at the Max-Planck-Institut für Chemische Physik fester Stoffe, (MPI CPfS) Dresden, using STM/S. This will provide a direct access for the investigation of phase separation, charge/orbital ordering, long range charge density wave modulation, and defect studies that influence magnetoresistance in perovskites. Since many layered systems have transition temperatures close to room temperature, we will explore potential materials for spintronic applications.
Last modified on September 14, 2009 Print version         Top
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