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Crystallography 2018
Structural Chemistry & Crystallography Communication
ISSN: 2470-9905
Page 61
June 04-05, 2018
London, UK
3
rd
Edition of International Conference on
Advanced Spectroscopy,
Crystallography and Applications
in Modern Chemistry
D
espite researchers developed a very good understanding
of metallic and insulating states in condensed matter
systems, the situation changes dramatically in the proximity
of a metalinsulator (MI) transition [1]. In fact, difficult to model
electronic correlations are very often at the origin of such
abrupt change that the whole model to describe the system
properties and excitations need to be adapted to the different
electronic behavior. MI transitions are also peculiar as it is not
straightforward to identify a primary order parameter. Recently
a lot of interest arose around 4d based materials, where the
occupancy of the 4d shell is a critical element in establishing
the electronic correlations [2]. Ru based materials are often in
a metallic state, however a notable exception is represented by
Ca2RuO4 (fig.1), this distorted Ruddlesden Popper system, is in
an insulating state at room temperature, however the transport
properties can be easily modified increasing the temperature [3]
or the pressure [4], or as more recently demonstrated applying
an unprecedently low voltage to the system [5]. Resonant X-ray
scattering (RXS) offers a unique opportunity to monitor the
structural, magnetic and electronic properties of this fascinating
material by following the evolution of the diffraction peaks related
to the orbital, magnetic and structural properties of the system
as function of the temperature and of an applied field. In this talk,
after a brief introduction to the RXS technique, we will review the
current understanding of the system behavior and present our
new insight about the evolution of the electronic properties of
the system [6]. The most exciting result being the fully reversible
suppression of the orbital ordered before the destructive IM
transition is completed.
Alessandro.Bombardi@diamond.ac.ukEXPLORING THE EVOLUTION OF THE ORBITAL AND MAGNETIC ORDERING
IN CA2RUO4 UNDER AN APPLIED FIELD
Alessandro Bombardi
Plymouth University, UK
Struct Chem Crystallogr Commun 2018, Volume 4
DOI: 10.21767/2470-9905-C1-006