The structural properties of oxygen-deficient ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}$ have been determined by neutron powder diffraction for 0.07<\ensuremath{\delta}<0.91. samples were produced quenching into liquid nitrogen from controlled oxygen partial pressures at 520 \ifmmode^\circ\else\textdegree\fi{}C, and they exhibit a clearly defined ``plateau'' behavior ${T}_{c}$ versus \ensuremath{\delta}....

Compact solid-state sources of terahertz (THz) radiation are being sought for sensing, imaging, and spectroscopy applications across the physical biological sciences. We demonstrate that coherent continuous-wave THz sizable power can be extracted from intrinsic Josephson junctions in layered high-temperature superconductor Bi2Sr2CaCu2O8. In analogy to a laser cavity, excitation an electromagnetic cavity resonance inside sample generates macroscopic state which large number synchronized...

dc magnetization measurements in fields up to 5 T on single crystals of ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}$ reveal a well defined onset diamagnetism allowing unique magnetic determination the upper critical field and its anisotropy. The upper-critical-field slopes are -1.9 -10.5 T/K corresponding coherence lengths 16 3 A\r{} for perpendicular parallel CuO planes. At magnetically determined nucleation temperatures no...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA new ambient-pressure organic superconductor, .kappa.-(ET)2Cu[N(CN)2]Br, with the highest transition temperature yet observed (inductive onset Tc = 11.6 K, resistive 12.5 K)Aravinda M. Kini, Urs Geiser, Hau H. Wang, K. Douglas Carlson, Jack Williams, W. Kwok, G. Vandervoort, James E. Thompson, Daniel L. Stupka, and Cite this: Inorg. Chem. 1990, 29, 14, 2555–2557Publication Date (Print):July 1, 1990Publication History Published online1 May...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFrom semiconductor-semiconductor transition (42 K) to the highest-Tc organic superconductor, .kappa.-(ET)2Cu[N(CN)2]Cl (Tc = 12.5 K)Jack M. Williams, Aravinda Kini, Hau H. Wang, K. Douglas Carlson, Urs Geiser, Lawrence Montgomery, Gloria J. Pyrka, Diana Watkins, Jefferson Kommers, and Cite this: Inorg. Chem. 1990, 29, 18, 3272–3274Publication Date (Print):September 1, 1990Publication History Published online1 May 2002Published inissue 1 September...

The melting transition in twinned and untwinned single crystals is measured resistively fields up to 8 T as a function of the angle between c axis a-b plane. angular dependence follows Lindemann criterion with ${\mathit{c}}_{\mathit{L}}$=0.15. suppression by strong pinning twin boundaries demonstrated.

Recent advances in the design and synthesis of organic synthetic metals have yielded materials that highest superconducting transition temperatures (T(c) approximately 13 kelvin) reported for these systems. These crystal structures consisting alternating layers donor molecules inorganic anions. Organic superconductors various electronic magnetic properties are similar to those copper oxide (which high T(c) values); similarities include highly anisotropic conductivities, critical fields,...

The structural and superconducting properties of orthorhombic tetragonal $\mathrm{Y}{\mathrm{Ba}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}x}$ have been determined for a wide range stoichiometries ($0.3<x<0.7$). In the phase, ${T}_{c}$ decreases smoothly as $x$ increases reaches zero at orthorhombic-to-tetragonal transition. Tetragonal is not any stoichiometry. This systematic depression correlated with decrease in oxygen content which alters electronic structure Cu-O networks.

We present the first direct observation of Lorentz-force-induced dissipative flux motion and effect twin boundaries as pinning centers in a single crystal ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}$ with planes oriented direction.

The behavior of vortex matter in high-temperature superconductors (HTS) controls the entire electromagnetic response material, including its current carrying capacity. Here, we review basic concepts pinning and application to a complex mixed landscape enhance critical reduce anisotropy. We focus on recent scientific advances that have resulted large enhancements in-field state-of-the-art second generation (2G) YBCO coated conductors prospect an isotropic, high-critical superconductor...

Hybrid dynamic systems have recently gained interest with respect to both fundamental physics and device applications, particularly their potential for coherent information processing. In this perspective, we will focus on the recent rapid developments of magnon-based hybrid systems, which seek combine magnonic excitations diverse transformative applications in devices, circuits, Key promising potentials is that magnons are highly tunable can be easily engineered couple various media...

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...

We demonstrate microwave-mediated distant magnon-magnon coupling on a superconducting circuit platform, incorporating chip-mounted single-crystal Y_{3}Fe_{5}O_{12} (YIG) spheres. Coherent level repulsion and dissipative attraction between the magnon modes of two YIG spheres are demonstrated. The former is mediated by cavity photons resonator, latter propagating coplanar waveguide. Our results open new avenues toward exploring integrated hybrid magnonic networks for coherent information...

The study of the anisotropic superconductor MgB2 using a combination scanning tunneling microscopy and spectroscopy reveals two distinct energy gaps at Delta(1)=2.3 meV Delta(2)=7.1 4.2 K. Different spectral weights partial superconducting density states are reflection different directions in this multiband system. Temperature evolution spectra follows BCS scenario [Phys. Rev. Lett. 3, 552 (1959)]] with both vanishing bulk T(c). data confirm importance Fermi-surface sheet dependent...

Magnetization measurements were performed on single crystals of $\mathrm{Y}{\mathrm{Ba}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}\ensuremath{\delta}}$ to study the effect fast neutron irradiation flux pinning and critical magnetization current. Neutron up a fluence 8.16\ifmmode\times\else\texttimes\fi{}${10}^{17}$ n/${\mathrm{cm}}^{2}$ systematically enhanced magnitude reduced anisotropy current compared unirradiated samples. The largest increases in occurred at 77 K. There was...

Moving- and stationary-sample SQUID magnetometry indicates discontinuous jumps of the magnetization an untwinned single crystal ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}\ensuremath{\delta}}$. The location these in $H$- $T$ plane coincides with resistive drops measured on same sample. These results demonstrate existence a first-order melting transition flux line lattice

The superconducting contribution to the magnetization and resistivity of twinned untwinned ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}$ crystals which are presented here, as well specific heat (Inderhees et al.) Ettinghausen coefficient (Palstra al.), displays scaling behavior in variable [T-${\mathit{T}}_{\mathit{c}}$(H)]/(TH${)}^{2/3}$. This is consistent with Ginzburg-Landau fluctuation theory for a 3D system high magnetic...

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...

The influence of process conditions (substrate loading rate and detachment force) on the structure biofilms grown basalt particles in a Biofilm Airlift Suspension (BAS) reactor was studied. (density, surface shape, thickness) microbial characteristics (biomass yield) were investigated at substrate rates 5, 10, 15, 20 kg COD/m3. day with concentrations 60 g/L, 150 250 g/L. concentration determines number biofilm steady state, which is main determining factor for these systems. In total, 12...

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...

We report structure, resistivity, and Meissner effect measurements on YBa2−xSrxCu3O7−δ for 0&amp;lt;x&amp;lt;2.0. find a region of solid solubility extending at least to x=1.0 monotonic depression Tc with x. Using arguments based structural changes Sr doping, we speculate that the is due local distortion lattice in neighborhood site introduction additional oxygen vacancies.

We present direct evidence of a "peak effect" as precursor to vortex lattice melting in single crystal $\mathrm{Y}{\mathrm{Ba}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}\ensuremath{\delta}}$ containing only two twin planes. The peak effect occurs just below the liquid solid phase transition narrow field region between 0.3 and 1.5 T for $H\ensuremath{\parallel}\mathbf{c}$ is clearly observed function both magnetic temperature. demonstrate that due enhanced pinning by boundaries,...