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Anand Bhattacharya
Argonne National Laboratory
"Digital Antiferromagnetic Manganites."
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Friday August 24, 2012
3:30pm PHYS 203
Refreshments are served at 3:00 p.m. in Physics room 242.
http://nano.anl.gov/docs/people/bhattacharya.pdf
The complex oxides have set the stage for some of the most intriguing phenomena including high temperature superconductivity, multiferroicity and many exotic forms of magnetism. In recent years, it has become possible to create artificial heterostructures where oxides with diverse ground states are brought together at atomically sharp interfaces. Due to ‘interfacial reconstructions’, these heterostructures may give rise to collective states with novel properties that are very different from those of their constituent materials. I will present our work on digital superlattices of (LaMnO3)p/(SrMnO3)q, where p, q are integers, and the La/Sr cations are ordered in two-dimensional planes. LaMnO3 and SrMnO3 are both antiferromagnetic insulators. However, depending upon the choice of p and q, the superlattices show a wide range of properties, including a ferromagnetic metal, an antiferromagnet with an enhanced ordering (Néel) temperature and a delta-doped ferromagnet within an antiferromagnetic host. If time permits, I will discuss briefly how this ‘digital synthesis’ approach may be used to explore a broad range of phenomena within the complex oxides and beyond.
References:
[1] "Enhanced ordering temperatures in antiferromagnetic manganite superlattices", S. May et al., Nature Materials 8, 892 (2009).
[2] “Delta Doping of Ferromagnetism in Antiferromagnetic Manganite Superlattices”, T. Santos et al., Phys. Rev. Lett. 107,167202 (2011).