Strong evidence for high intergranular critical current densities and large bulk magnetic flux pinning in superconducting polycrystalline MgB2 has been observed. The presence of strongly-coupled grain boundaries this material confirmed by a dramatic collapse the hysteresis loop when specimen is ground into fine powder re-measured under similar conditions. Further strong intergrain links provided continuous variation remanent moment up to full penetration field sample. absence weak-link...

Borophene, the lightest among all Xenes, possesses extreme electronic mobility along with high carrier density and Young's modulus. To accomplish device-quality borophene, novel approaches of realization monolayers need to be urgently explored. In this work, micromechanical exfoliation is discovered result in mono- few-layered borophene device quality. Borophene sheets are successfully fabricated down monolayer thickness. Distinct crystallographic phases viz. XRD study reveals phase...

Superconducting nanowires, with a critical temperature of 5.2K, have been synthesized using an ion-beam-induced deposition, gallium focused ion beam and tungsten carboxyl, W(CO)6, as precursor. The films are amorphous, atomic concentrations about 40%, 20% for W, C, Ga, respectively, 0K values the upper field coherence length 9.5T 5.9nm, deduced from resistivity data at different applied magnetic fields. current density is Jc=1.5×105A∕cm2 3K. This technique can be used template-free...

Exfoliation of two-dimensional (2D) nanosheets from three-dimensional (3D) non-layered, non-van der Waals crystals represents an emerging strategy for materials engineering that could significantly increase the library 2D materials. Yet, exfoliation mechanism in which are derived not intrinsically layered remains unclear. Here, we show planar defects starting 3D boron material promote sheets-by combining liquid-phase exfoliation, aberration-corrected scanning transmission electron...

Superconducting properties of single-crystalline $\mathrm{Ca}({\mathrm{Al}}_{0.5},{\mathrm{Si}}_{0.5}{)}_{2},$ which is isostructural to ${\mathrm{MgB}}_{2},$ were studied by measurements electrical resistivity, Hall coefficient, and magnetization. $\mathrm{Ca}({\mathrm{Al}}_{0.5},{\mathrm{Si}}_{0.5}{)}_{2}$ a type-II superconductor with carrier density...

A fabrication method for positioning and embedding a single-walled carbon nanotube (SWNT) across the diameter of solid state nanopore is presented. Chemical vapor deposition (CVD) used to grow SWNTs over arrays focused ion beam (FIB) milled pores in thin silicon nitride membrane. This typically yields at least one pore whose centrally crossed by SWNT. The final FIB adjusted create any desired atomic layer deposition, simultaneously insulating SWNT everywhere but region that crosses nanopore,...

A direct patterning technique of gallium-irradiated superconducting silicon has been established by focused gallium-ion beam without any mask-based lithography process. The electrical transport measurements for line and square shaped patterns were carried out under self-field magnetic field up to 7 T. Sharp transitions observed in both at temperature K. pattern exhibited a signature higher onset above 10 critical dose amount obtain the was investigated fabrication various samples with...

The superconducting properties of filled skutterudite ${\mathrm{La}}_{0.8}{\mathrm{Rh}}_{4}{\mathrm{P}}_{12}$ synthesized at $9.4\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$ and $1473\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ using a belt-type apparatus were investigated by measuring the magnetization, electrical resistivity, specific heat. Filled is type-II material with critical temperature for transition, ${T}_{C}$, $14.9\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. upper field ${H}_{C2}(0)$...

We have studied the temperature dependence of in-plane resistivity NbN/AlN multilayer samples with varying insulating layer thickness in magnetic fields up to 7 T parallel and perpendicular films. The upper critical field shows a crossover from 2D 3D behavior fields. irreversibility lines form (1-T/T(c))(alpha), where alpha varies 4 / 3 2 increasing anisotropy. results are consistent simultaneous melting decoupling transitions for low anisotropy sample, decoupled pancakes superconducting...

A method is introduced to isolate and measure the electrical transport properties of individual single-walled carbon nanotubes (SWNTs) aligned on an ST-cut quartz, from room temperature down 2 K. The diameter chirality measured SWNTs are accurately defined Raman spectroscopy atomic force microscopy (AFM). significant up-shift in G-band resonance spectra observed, which increases with increasing diameter, indicates a strong interaction quartz substrate. semiconducting SWNT, 0.84 nm, shows...

We propose a novel magnetic sensor to apply new phenomenon in high Tc superconductors of strongly anisotropic materials. have found periodic oscillations the flux-flow resistance Josephson vortices intrinsic junctions single crystalline Bi2Sr2CaCu2O8+y, fabricated by using focused ion beam. The been observed at higher fields than 70 kOe low temperatures. period depends only on junction width perpendicular and current, independent temperature field. detailed analyses show that characteristics...

We introduce a novel nanofabrication technique to directly deposit catalyst pads for the chemical vapor deposition synthesis of single-walled carbon nanotubes (SWCNTs) at any desired position on substrate by Gallium focused ion beam (FIB) induced silicon oxide thin films from metalorganic Tetraethyl orthosilicate (TEOS) precursor. A high resolution in positioning SWCNTs is naturally achieved as imaging and FIB are conducted concurrently situ same selected point substrate. This has...

We have developed an electrostatic levitation furnace for performing a containerless solidification process on superconductors. Spherical niobium is solidified from the large undercooled state at approximately around 400°C below melting temperature. The morphologies show homogeneous cellular structures over entire surface. X-ray Laue photographs indicate that spherical composed of single grain. Magnetization superconducting transition temperature shows perfect diamagnetism in low magnetic...

We have found periodic oscillations in the flux flow resistance of Josephson vortices along c-axis Bi-2212 single crystals. The oscillates periodically with increasing parallel magnetic fields above about 6 kOe, independent magnitude field and temperature. constant period dynamical behaviors suggest vortex states a new application to precise sensors Tesla order.

Graphene, an atomic thin sheet of monolayer carbon atoms, is deemed to replace silicon and revolutionize the electronics industry. It has massless Dirac fermions exhibits ballistic charge transport, a prerequisite for upcoming futuristic nanodevices, such as field-effect transistors, sensors, etc. However, it lacks intrinsic electronic bandgap thus obsolete use in these applications. In this work, first principles study used predict opening graphene by engineered introduction modulations its...