476 research outputs found
High mobility in a van der Waals layered antiferromagnetic metal
Magnetic van der Waals (vdW) materials have been heavily pursued for
fundamental physics as well as for device design. Despite the rapid advances,
so far magnetic vdW materials are mainly insulating or semiconducting, and none
of them possesses a high electronic mobility - a property that is rare in
layered vdW materials in general. The realization of a magnetic high-mobility
vdW material would open the possibility for novel magnetic twistronic or
spintronic devices. Here we report very high carrier mobility in the layered
vdW antiferromagnet GdTe3. The electron mobility is beyond 60,000 cm2 V-1 s-1,
which is the highest among all known layered magnetic materials, to the best of
our knowledge. Among all known vdW materials, the mobility of bulk GdTe3 is
comparable to that of black phosphorus, and is only surpassed by graphite. By
mechanical exfoliation, we further demonstrate that GdTe3 can be exfoliated to
ultrathin flakes of three monolayers, and that the magnetic order and
relatively high mobility is retained in approximately 20-nm-thin flakes
A simplified low volume colorimetric assay for rapid comparison of cyanogenic glycoside production between barley genotypes
Ethyl carbamate (EC), a genotoxic and carcinogenic compound, is an undesirable trace component in spirits and whisky. The precursor of EC produced from barley (Hordeum vulgare L.) malt is primarily a cyanogenic glycosidic nitrile (GN) known as epiheterodendrin (EPH). EPH production is genetically controlled in barley, low or non-GN varieties exist and EPH production can be controlled by using low or non-GN barley varieties for malt production. Here, we report on a rapid and inexpensive colorimetric assay modified from Cook and Oliver (in: European Brewery Convention (eds) Proceedings of the 23rd Congress, Lisbon. European Brewery Convention, Zoeterwoude, Netherlands, 1991). The new low-volume, high-throughput, semi-quantitative test method can be used for the selection of low or non-GN breeding lines through samples of acrospires. This method is based on the detection of cyanide by the reaction with chloramine-T followed by the addition of the reagent (pyridine-barbituric acid) to form a soluble violet-blue product measured at 590 nm. Absorbance measurements and the visual color are used to estimate the presence of EPH production in acrospires. In this report, the level of EPH production was compared among some commercial European non-GN lines, Canadian malt varieties and advanced barley breeding lines
Pathogenic variants in CRX have distinct cis-regulatory effects on enhancers and silencers in photoreceptors
Dozens of variants in the gene for the homeodomain transcription factor (TF) cone-rod homeobox
The parallax and 3D kinematics of water masers in the massive star-forming region G034.43+0.24
We report a trigonometric parallax measurement of 22 GHz water masers in the
massive star-forming region G034.43+0.24 as part of the Bar and Spiral
Structure Legacy (BeSSeL) Survey using the Very Long Baseline Array. The
parallax is 0.33050.018 mas, corresponding to a distance of
kpc. This locates G034.43+0.24 near the inner edge of
the Sagittarius spiral arm and at one end of a linear distribution of massive
young stars which cross nearly the full width of the arm. The measured
3-dimensional motion of G034.43+0.24 indicates a near-circular Galactic orbit.
The water masers display arc-like distributions, possibly bow shocks,
associated with winds from one or more massive young stars
Axial Higgs Mode Detected by Quantum Pathway Interference in RTe3
The observation of the Higgs boson solidified the standard model of particle
physics. However, explanations of anomalies (e.g. dark matter) rely on further
symmetry breaking calling for an undiscovered axial Higgs mode. In condensed
matter the Higgs was seen in magnetic, superconducting and charge density
wave(CDW) systems. Uncovering a low energy mode's vector properties is
challenging, requiring going beyond typical spectroscopic or scattering
techniques. Here, we discover an axial Higgs mode in the CDW system RTe3 using
the interference of quantum pathways. In RTe3 (R=La,Gd), the electronic
ordering couples bands of equal or different angular momenta. As such, the
Raman scattering tensor associated to the Higgs mode contains both symmetric
and antisymmetric components, which can be excited via two distinct, but
degenerate pathways. This leads to constructive or destructive interference of
these pathways, depending on the choice of the incident and Raman scattered
light polarization. The qualitative behavior of the Raman spectra is
well-captured by an appropriate tight-binding model including an axial Higgs
mode. The elucidation of the antisymmetric component provides direct evidence
that the Higgs mode contains an axial vector representation (i.e. a
pseudo-angular momentum) and hints the CDW in RTe3 is unconventional. Thus we
provide a means for measuring collective modes quantum properties without
resorting to extreme experimental conditions
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