APS March Meeting 2017
Volume 62, Number 4
Monday–Friday, March 13–17, 2017;
New Orleans, Louisiana
Session E43: Spin Orbit Physics in Oxides II
8:00 AM–11:00 AM,
Tuesday, March 14, 2017
Room: 390
Sponsoring
Units:
GMAG DMP DCOMP
Chair: Alex Thaler, Oak Ridge National Lab
Abstract ID: BAPS.2017.MAR.E43.1
Abstract: E43.00001 : Transport properties of correlated metals: A dynamical mean field theory perspective*
8:00 AM–8:36 AM
Preview Abstract
Abstract
Author:
Xiaoyu Deng
(Rutgers Univ)
Strongly correlated metals, including many transition metal oxides, are
characterized by unconventional transport properties with anomalous
temperature dependence. For example, in many systems Fermi liquid behavior
holds only below an extremely low temperature while at high temperature
these bad metals have large resistivity which exceeds the Mott-Ioffe-Regel
(MIR) limit. Material specific calculation of these anomalous transport
properties is an outstanding challenge.
Recent advances enabled us to study the transport and optical properties of
two archetypal correlated oxides, vanadium oxides and ruthenates, using the
LDA$+$DMFT method. In V2O3, the prototypical Mott system, our computed
resistivity and optical conductivity are in very good agreement with
experimental measurements, which clearly demonstrates that the strong
correlation dominates the transport of this material [4]. Furthermore by
expressing the resistivity in terms of an effective plasma frequency and an
effective scattering rate, we uncover the so-called "hidden Fermi liquid"
[1, 2, 3] behavior, in both the computed and measured optical response of
V2O3. This paradigm explains the optics and transport in other materials
such as NdNiO3 film and CaRuO3.
In the ruthenates family, we carried out a systematical theoretical study on
the transport properties of four metallic members, Sr2RuO4, Sr3Ru2O7, SrRuO3
and CaRuO3, which generally encapsulates the gradually structure evolution
from two-dimension to three dimension. With a unified computational scheme,
we are able to obtain the electronic structure and transport properties of
all these materials [5]. The computed effective mass enhancement,
resistivity and optical conductivity are good agreement with experimental
measurements, which indicates that electron-electron scattering dominates
the transport of ruthenates. We explain why the single layered compound
Sr2RuO4 has a relative weak correlation with respect to its siblings, which
corroborates its good metallicity.
Comparing our results with experimental data, benchmarks the capability as
well as the limitations of existing methodologies for describing transport
properties of realistic correlated materials.
[1] Xiaoyu Deng, Jernej Mravlje, Rok Zitko, Michel Ferrero, Gabi Kotliar,
Antoine Georges, Physical Review Letters, 110, 086401 (2013).
[2] Christophe Berthod, Jernej Mravlje, Xiaoyu Deng, Rok Zitko, Dirk van der
Marel, and Antoine Georges, [3] Phys. Rev. B, 87, 115109 (2013)
Wenhu Xu, Kristjan Haule, and Gabriel Kotliar, Physical Review Letters, 111,
036401(2013)
[4] Xiaoyu Deng, Aaron Sternbach, Kristjan Haule, D. N. Basov, Gabriel
Kotliar, Physical Review Letters, 113, 246404 (2014)
[5] Xiaoyu Deng, Kristjan Haule, Gabriel Kotliar, Physical Review Letters,
116, 256401 (2016).
*Supported by NSF DMR-1308141
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2017.MAR.E43.1