Burning magnesium metal in dry ice resulted few-layer nanosheets of graphene high yields. These carbon nanomaterials were characterized by Raman spectroscopy, energy-dispersive X-ray analysis, powder diffraction and transmission electron microscopy. This work provides an innovative route for producing one the most promising nanostructures capturing dioxide that is popularly known as greenhouse gas.

We demonstrate strong magnon-photon coupling of a thin-film Permalloy device fabricated on coplanar superconducting resonator. A strength 0.152 GHz and cooperativity 68 are found for 30-nm-thick stripe. The is tunable by rotating the biasing magnetic field or changing volume Permalloy. also observe an enhancement in nonlinear regime resonator, which attributed to nucleation dynamic flux vortices. Our results critical step towards future integrated hybrid systems quantum magnonics on-chip...

A superconducting diode is an electronic device that conducts supercurrent and exhibits zero resistance primarily for one direction of applied current. Such a dissipationless desirable unit constructing circuits with ultralow power consumption. However, realizing fundamentally technologically challenging, as it usually requires material structure without centre inversion, which scarce among materials. Here, we demonstrate achieved in conventional film patterned conformal array nanoscale...

Transport studies in a Corbino disk suggest that the Bragg glass phase undergoes first-order transition into disordered solid. This shows sharp reentrant behavior at low fields. In contrast, conventional strip configuration, is obscured by injection of vortices through sample edges, which results commonly observed vortex instabilities and smearing peak effect NbSe2 crystals. These features are found to be absent geometry circulating do not cross edges.

Hydrogen sensors based on single Pd nanowires show promising results in speed, sensitivity, and ultralow power consumption. The utilization of nanowires, however, face challenges nanofabrication, manipulation, achieving ultrasmall transverse dimensions. We report hydrogen that take advantage palladium high speed sensitivity can be fabricated conveniently. are networks (<10 nm) deposited onto commercially available filtration membranes. investigated the sensitivities response times these as a...

Resistive-type palladium structures for hydrogen sensing remains as a research focus their simplicity in device construction. We demonstrate that siloxane self-assembled monolayer placed between substrate and an evaporated ultrathin Pd film promotes the formation of small nanoclusters reduces stiction substrate. The resulting nanocluster can detect 2%H2 with rapid response time ∼70ms is sensitive to 25 ppm hydrogen, detectable by 2% increase conductance due hydrogen-induced lattice expansion.

Porous alumina membranes are commercially available and have been widely used in recent nanoscale research, for example, as templates nanowire fabrication through electrodeposition. In this report, we present a new use porous the of nanotubes/nanowires desired electrochemical devices catalytic applications. A high yield is obtained by etching an aqueous sodium hydroxide solution. We studied effects time solution concentration characterized using scanning electron microscope (SEM). discussion...

The three-dimensional (3D) topological Dirac semimetal is a new phase of matter, viewed as the 3D analogy graphene with linear dispersion in momentum space. Here, we report angular dependent magnetotransport Cd3As2 single crystal and clearly show how Fermi surface evolves when tilting magnetic field. Remarkably, field lies [112] [44-1] axis, only oscillation period features present, however, system shows double oscillations applied along [1-10] direction. Moreover, at certain direction also...

A hallmark of materials with extremely large magnetoresistance (XMR) is the transformative turn-on temperature behavior: when applied magnetic field $H$ above certain value, resistivity versus $\ensuremath{\rho}(T)$ curve shows a minimum at dependent ${T}^{*}$, which has been interpreted as magnetic-field-driven metal-insulator transition or attributed to an electronic structure change. Here, we demonstrate that curves behavior in newly discovered XMR material ${\mathrm{WTe}}_{2}$ can be...

From a bar to charge, magnetically Artificial spin ices are arrays of nanoscale magnets that can mimic the behavior naturally occurring “frustrated” magnetic materials. Usually take form square lattice with perpendicular its sides. Wang et al. “broke up” each into positive and negative charge. Working backward from an array these charges, they designed structure has oriented not only perpendicularly sides but also diagonally. Compared traditional one, this was much more controllable by...

Extremely large magnetoresistance (XMR) was recently discovered in WTe_{2}, triggering extensive research on this material regarding the XMR origin. Since WTe_{2} is a layered compound with metal layers sandwiched between adjacent insulating chalcogenide layers, has been considered to be electronically two-dimensional (2D). Here we report two new findings WTe_{2}: (1) 3D mass anisotropy as low 2, revealed by scaling behavior of resistance R(H,θ)=R(ϵ_{θ}H)...

When the dimension of materials decreases to mesoscale, their properties can change dramatically, depending on boundary conditions imposed by sample architecture including geometry, morphology, and hierarchical structures. Here we show that electrodeposition, a method for reducing from solution onto substrate, provide versatile pathway tailor mesostructures. Novel lead (Pb) structures ranging nanowires, mesoparticles with octahedral, decahedral, icosahedral shapes porous multipods,...

The newly developed hydrogen sensor, based on a network of ultrasmall pure palladium nanowires sputter-deposited filtration membrane, takes advantage single nanowires' characteristics high speed and sensitivity while eliminating their nanofabrication obstacles. However, this new type like the nanowires, cannot distinguish concentrations above 3%, thus limiting potential applications sensor. This study reports sensors Cr-buffered Pd (Pd/Cr) membrane. These not only are able to outperform...

We report an anomalous matching effect in MoGe thin films containing pairs of circular holes arranged such a way that four those meet at each vertex point square lattice. A remarkably pronounced fractional was observed the magnetic field dependences both resistance and critical current. At half current can be even higher than zero field. This has never been before for vortices superconductors with pinning arrays. Numerical simulations within nonlinear Ginzburg-Landau theory reveal vortex ice...

We show in the case of a superconducting Nb ladder that mesoscopic superconductor typically exhibits magnetoresistance oscillations whose amplitude and temperature dependence are different from those stemming Little-Parks effect. demonstrate these large resistance (as well as monotonic background on which they superimposed) due to current-excited moving vortices, where applied current competition with oscillating Meissner currents imposes or removes barriers for vortex motion an increasing...

The maximum current (critical current) a type-II superconductor can transmit without energy loss is limited by the motion of quantized magnetic flux penetrating into superconductor. Introducing nanoscale holes superconducting film has been long pursued as promising way to increase critical current. So far enhancement was found be mostly low fields. Here we experimentally investigate currents films with conformal array that have nonuniform density while preserving local ordering. We find...

Electrochemical doping was used to dope lithium into perovskite CsPbBr3 crystal. Due the doping, diamagnetic behavior observed with a transition temperature (Tc) of 7.17 K. Burstein–Moss effect related photoluminescence (PL) blue-shift as long 15 nm. UV–vis-NIR spectra indicate that absorption has been enhanced. The doped crystal generated 8 nA photocurrent, which is higher than undoped

Large area nickel antidot arrays with density up to 10^10 /cm^2 have been fabricated by depositing onto anodic aluminum oxide membranes that contain lattices of nanopores. Electron microscopy images show a high degree order the arrays. Various sizes and shapes antidots were observed increasing thickness deposited nickel. New features appear in both magnetization transport measurements when external magnetic field is parallel current direction, including an enhancement nonmonotonous...

We report on experiments probing the evolution of a vortex state in response to driving current 2H-NbSe$_2$ crystals. By following motion with fast transport measurements we find that enables system reorganize and access new configurations. During this process exhibits long-term memory: if is turned off vortices freeze place remembering their prior motion. When restored resumes where it stopped. The provide evidence for dynamically driven structural change lattice corresponding dynamic phase...

Nb films containing extended arrays of holes with 45-nm diameter and 100-nm spacing have been fabricated using anodized aluminum oxide (AAO) as substrate. Pronounced matching effects in the magnetization Little-Parks oscillations superconducting critical temperature observed fields up to 9 kOe. Flux pinning patterned samples is enhanced by two orders magnitude compared unpatterned reference applied exceeding 5 Matching are a dominant contribution vortex at temperatures low 4.2 K due...

In this work, it has been shown that, through a highly controlled process, the chemical etching of anodic aluminum oxide membrane barrier layer can be performed in such way as to achieve nanometer-scale control pore opening. As is etched away, subtle differences revealed AFM phase imaging alumina composition give rise unique pattern hexagonal walls surrounding each domes. These nanostructures observed both topography and images understood oxalate anion contaminated versus pure alumina. This...

The in-plane thermal conductivity $\ensuremath{\kappa}$ of the iron selenide superconductor ${\text{FeSe}}_{x}$ $({T}_{c}=8.8\text{ }\text{K})$ was measured down to 120 mK and up 14.5 T $(\ensuremath{\simeq}3/4{H}_{{c}_{2}})$. In zero field, residual linear term ${\ensuremath{\kappa}}_{0}/T$ at $T\ensuremath{\rightarrow}0$ is only about $16\text{ }\ensuremath{\mu}\text{W}\text{ }{\text{K}}^{\ensuremath{-}2}\text{ }{\text{cm}}^{\ensuremath{-}1}$, less than 4% its normal-state value. Such a...

Iron selenide (FeSex) crystals with lateral dimensions up to millimeters were grown via a vapor self-transport method. The consist of the dominant α-phase trace amounts β-phase as identified by powder x-ray diffraction. With four-probe resistance measurements, we obtained zero critical temperature 7.5 K and superconducting onset transition 11.8 in magnetic field well an anisotropy 1.5±0.1 for field. Magnetization measurements on individual reveal coexistence superconductivity ferromagnetism.