634 research outputs found
Incommensurate phonon anomaly and the nature of charge density waves in cuprates
While charge density wave (CDW) instabilities are ubiquitous to
superconducting cuprates, the different ordering wavevectors in various cuprate
families have hampered a unified description of the CDW formation mechanism.
Here we investigate the temperature dependence of the low energy phonons in the
canonical CDW ordered cuprate LaBaCuO. We discover
that the phonon softening wavevector associated with CDW correlations becomes
temperature dependent in the high-temperature precursor phase and changes from
a wavevector of 0.238 reciprocal space units (r.l.u.) below the ordering
transition temperature up to 0.3~r.l.u. at 300~K. This high-temperature
behavior shows that "214"-type cuprates can host CDW correlations at a similar
wavevector to previously reported CDW correlations in non-"214"-type cuprates
such as YBaCuO. This indicates that cuprate CDWs may
arise from the same underlying instability despite their apparently different
low temperature ordering wavevectors.Comment: Accepted in Phys. Rev. X; 9 pages; 5 figures; 3 pages of
supplementary materia
Patterning of two-dimensional electron systems in SrTiO₃ based heterostructures using a CeO₂ template
Two-dimensional electron systems found at the interface of SrTiO3-based oxide heterostructures often display anisotropic electric transport whose origin is currently under debate. To characterize transport along specific crystallographic directions, we developed a hard-mask patterning routine based on an amorphous CeO2 template layer. The technique allows preparing well-defined microbridges by conventional ultraviolet photolithography which, in comparison to standard techniques such as ion- or wet-chemical etching, does not induce any degradation of interfacial conductance. The patterning scheme is described in detail and the successful production of microbridges based on amorphous Al2O3-SrTiO3 heterostructures is demonstrated. Significant anisotropic transport is observed for T < 30 K which is mainly related to impurity/defect scattering of charge carriers in these heterostructures
Magnetotransport of SrIrO 3 -based heterostructures
Transition-metal oxide (TMO) based heterostructures provide fertile playground to explore or
functionalize novel quantum materials. In this regard, the combination of 3d and 5d TMOs have
gained special interest because of the simultaneous appearance of strong spin-orbit coupling
and electron correlation at the interface of those heterostructures. Artificial breaking of the
inversion symmetry in heterostructures may also result in a distinct interfacial Dzyaloshinskii-
Moriya interaction (DMI) and the formation of non-collinear magnetic spin structures in case
of magnetic TMOs. Among the 5d TMOs, SrIrO3 (SIO) has gained significant attention because
of its large spin-orbit coupling and the semi-metallic ground state, which are highly susceptible
to structural distortions. Here, we report on the preparation and the characterisation of
structural, electronic and magnetic properties of epitaxial heterostructures consisting of the 5d
TMO SIO and the 3d antiferromagnetic insulator LaFeO3
Raman Scattering Study of the Lattice Dynamics of Superconducting LiFeAs
We report an investigation of the lattice dynamical properties of LiFeAs
using inelastic light scattering. Five out of the six expected phonon modes are
observed. The temperature evolution of their frequencies and linewidths is in
good agreement with an anharmonic-decay model. We find no evidence for
substantial electron-phonon coupling, and no superconductivity-induced phonon
anomalies.Comment: 5 pages, 3 figures, 1 tabl
Understanding the complex phase diagram of uranium: the role of electron-phonon coupling
We report an experimental determination of the dispersion of the soft phonon
mode along [1,0,0] in uranium as a function of pressure. The energies of these
phonons increase rapidly, with conventional behavior found by 20 GPa, as
predicted by recent theory. New calculations demonstrate the strong pressure
(and momentum) dependence of the electron-phonon coupling, whereas the
Fermi-surface nesting is surprisingly independent of pressure. This allows a
full understanding of the complex phase diagram of uranium, and the interplay
between the charge-density wave and superconductivity
Stadium attendance demand in the men’s UEFA Champions League: Do fans value sporting contest or match quality?
This paper is the first to empirically analyse the determinants of stadium attendance demand in the men’s UEFA Champions League, the most prestigious competition in club football. The analysis covers 1,234 matches from 2009/10 to 2018/19 across 32 nations. The results show that outcome uncertainty and competitive intensity are not significantly associated with higher attendances, but the level of team quality is, for all fans, and the presence of star players is, for fans of clubs outside the top five European leagues. The empirical analysis—based on Tobit model regressions—enables an evidence-informed discussion of the competition structure of the UCL and the highly charged debate surrounding a potential European Super League. The article also offers insights for the wider body of academic knowledge on stadium attendance demand, by adding rare analysis of an international cup competition and an improved understanding of the connection between star players and fan interest in European football
Anomalous pressure dependence of the electronic transport and anisotropy in SrIrO₃ films
Iridate oxides display exotic physical properties that arise from the interplay between a largespin–orbit coupling and electron correlations. Here, we present a comprehensive study of theeffects of hydrostatic pressure on the electronic transport properties of SrIrO3(SIO), a systemthat has recently attracted a lot of attention as potential correlated Dirac semimetal. Ourinvestigations on untwinned thin lms of SIO reveal that theelectrical resistivity of thismaterial is intrinsically anisotropic and controlled by the orthorhombic distortion of theperovskite unit cell. These effects provide another evidence for the strong coupling betweenthe electronic and lattice degrees of freedom in this class of compounds. Upon increasingpressure, a systematic increase of the transport anisotropies is observed. The anomalouspressure-induced changes of the resistivity cannot be accounted for by the pressuredependence of the density of the electron charge carriers, as inferred from Hall effectmeasurements. Moreover, pressure-induced rotations of the IrO6octahedra likely occur withinthe distorted perovskite unit cell and affect electron mobility of this syste
Inelastic neutron and x-ray scattering as probes of the sign structure of the Fe-pnictide superconducting gap
Neutron spin-flip scattering observations of a resonance in the
superconducting state is often taken as evidence of an unconventional
superconducting state in which the gap changes sign
for momentum transfers which play an important role in the pairing.
Recently questions regarding this identification for the Fe-pnictide
superconductors have been raised and it has been suggested that
. Here we propose that inelastic neutron or x-ray
scattering measurements of the spectral weight of a phonon of momentum can
distinguish between these two pairing scenarios.Comment: 4 pages, 4 figure
Charge order driven by Fermi-arc instability in Bi2201
The understanding of the origin of superconductivity in cuprates has been
hindered by the apparent diversity of intertwining electronic orders in these
materials. We combined resonant x-ray scattering (REXS), scanning-tunneling
microscopy (STM), and angle-resolved photoemission spectroscopy (ARPES) to
observe a charge order that appears consistently in surface and bulk, and in
momentum and real space within one cuprate family, Bi2201. The observed wave
vectors rule out simple antinodal nesting in the single-particle limit but
match well with a phenomenological model of a many-body instability of the
Fermi arcs. Combined with earlier observations of electronic order in other
cuprate families, these findings suggest the existence of a generic
charge-ordered state in underdoped cuprates and uncover its intimate connection
to the pseudogap regime.Comment: A high resolution version can be found at
http://www.phas.ubc.ca/~quantmat/ARPES/PUBLICATIONS/Articles/Bi2201_CDW_REXS_STM.pdf
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