Filters
Results 1 - 10 of 95
Results 1 - 10 of 95.
Search took: 0.018 seconds
Sort by: date | relevance |
AbstractAbstract
[en] Epitaxial titanium diboride thin films have been deposited on sapphire substrates by pulsed laser ablation technique. Structural properties of the films have been studied during the growth by reflection high energy electron diffraction (RHEED) and ex-situ by means of X-ray diffraction techniques; both kinds of measurements indicate a good crystallographic orientation of the TiB2 film both in plane and along the c axis. A flat surface has been observed by atomic force microscopy imaging. Electrical resistivity at room temperature resulted to be five times higher than the value reported for single crystals. The films also resulted to be very stable at high temperature, which is very promising for using this material as a buffer layer in the growth of magnesium diboride thin films
Primary Subject
Source
S0040609003010253; Copyright (c) 2003 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Country of publication
ALKALINE EARTH METAL COMPOUNDS, BORIDES, BORON COMPOUNDS, COHERENT SCATTERING, CRYSTAL GROWTH METHODS, CRYSTALS, DEPOSITION, DIFFRACTION, ELECTRICAL PROPERTIES, ELECTROMAGNETIC RADIATION, FILMS, IRRADIATION, MAGNESIUM COMPOUNDS, MICROSCOPY, PHYSICAL PROPERTIES, RADIATIONS, SCATTERING, SURFACE COATING, TEMPERATURE RANGE, TITANIUM COMPOUNDS, TRANSITION ELEMENT COMPOUNDS
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
External URLExternal URL
AbstractAbstract
[en] This book covers the proceedings of the 3rd National Meeting on High Temperature Superconductivity Topics includes: Crystal growth of superconductors; thermodynamic stability of superconducting materials; spectroscopy of High Tc Superconductors; synchrotron radiation investigation of superconductors; density state determination; measurements of current density; preparation and characterization of superconductors
Primary Subject
Secondary Subject
Source
1990; 418 p; World Scientific Pub. Co; Teaneck, NJ (United States); 3. national meeting on high temperature superconductivity; Genoa (Italy); 12-14 Feb 1990; CONF-9002195--; ISBN 981-02-0202-4;
; World Scientific Pub. Co., 687 Hartwell Street, Teaneck, NJ 07666 (United States)

Record Type
Book
Literature Type
Conference
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] Critical fields of four MgB2 thin films with a normal state resistivity ranging from 5 to 50 μΩ cm and Tc from 29.5 to 38.8 K were measured up to 28 T. Hc2(T) curves present a linear behavior towards low temperatures. Very high critical field values have been found, up to 24 T along the c-axis and 57 T in the basal plane not depending on the normal state resistivity values. In this paper, critical fields will be analyzed taking into account the multiband nature of MgB2; we will show that resistivity and upper critical fields can be ascribed to different scattering mechanisms
Source
7. M2SRIO: International conference on materials and mechanisms of superconductivity and high temperature superconductors; Rio de Janeiro (Brazil); 25-30 May 2003; S0921453404002266; Copyright (c) 2004 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Literature Type
Conference
Journal
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] Nb3Sn commercial wires (diameter 0.5 mm, 3700 filaments) have been hydrogen doped at various concentrations and the superconducting properties of these wires have been correlated to the hydrogen content x in Nb3SnH /SUB x/ . Here the results are presented which regard critical temperature and overall critical current density for applied fields from 9 T to 12 T at 4.2K and 6K for hydrogen content up to x = 0.310. The critical temperature trend shows a slight maximum at x approx. = 0.02, after which it decays abruptly. Also the critical overall current density at same hydrogen concentration is higher than that of unhydrogenated samples at 4.2 K and is comparable or better at 6 K. The resulting dJ /SUB ov/ /dB shows a good behaviour in the studied field range
Secondary Subject
Record Type
Journal Article
Journal
IEEE Transactions on Magnetics; ISSN 0018-9464;
; v. 19(3); p. 897-899

Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] Laboratory scale ternary alloys Nb-43 wt % Ti-25 wt% Ta, Nb-38 wt % Ti-34 wt % Ta, Nb-51 wt % Ti-14.7 wt % Ta were prepared. The alloys exhibit excellent ductility and thus no problems arise during production and handling of the cables. As for the Nb-Yi alloys, an increase of intermediate cold-work degree; also for ternary alloys, leads to better superconducting properties. After adequate optimization, the Nb-38 wt % Ti-34 wt % Ta alloy shows the best superconducting properties and, at 12 Tesla and 2.15K, Jsub(c)=600A/mm2 can be reached
Primary Subject
Source
8. International conference on magnet technology; Grenoble (France); 5-9 Sep 1983
Record Type
Journal Article
Literature Type
Conference
Journal
Journal de Physique. Colloque; ISSN 0449-1947;
; v. 45(C-1); p. 433-436

Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] In this paper the authors report results on the growth of borocarbides ErNi2B2C and DyNi2B2C thin films by an ultra high vacuum laser ablation technique. The dependence of the film structure and properties on the deposition parameters has been studied. Moreover the possibility to obtain superconducting films with a tungsten buffer layer on MgO substrates has been successfully checked. Here the authors present details on the deposition procedure as well as on the structural, morphological, and physical characterization
Primary Subject
Source
9. national congress on high temperature superconductivity (SATT9); Ravenna (Italy); 6-9 Oct 1998; CONF-9810174--
Record Type
Journal Article
Literature Type
Conference
Journal
International Journal of Modern Physics B; ISSN 0217-9792;
; CODEN IJPBEV; v. 13(9-10); p. 1049-1054

Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] The behaviour in a magnetic field of YBa2Cu3O7-y sintered samples is described. A.C. susceptibility and magnetization measurements on samples with different geometries are reported. The results show in addition to a macroscopically superconducting behaviour the presence, for magnetic filds large enough, of superconducting grains separated by regions of meterial in a normal state. All the experimental results will be described in these terms. The intra-grain critical currents as well as the inter-grains ones, which are much lower, are described
Original Title
Comportamento in campo magnetico di ossidi superconduttori sinterizzati
Record Type
Journal Article
Journal
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] Quantum Hall effect measurements on commercial low-mobility n-channel MOSFETs have been performed. The channel resistance vs. electron concentration has the expected oscillating behaviour and gives the quantized values for the Hall resistance, at least in the region of higher mobility. One class of the tested samples gave a surprising behaviour, both in QHE and in field effect mobility measurements: this is thought to be due to uncontrolled differences in the diffusion zones at the interface between the channel and the contacts. In particular, it is attributed the deformation of the QHE curves to the onset of a thermoelectromotive force which is present in the electron gas even if the sample is isothermal. A clear evidence for thermoelectric effects is given by measurements made on a high-quality Hall geometry MOSFET
Primary Subject
Record Type
Journal Article
Journal
Nuovo Cim., D; CODEN NCSDD; v. 9(3); p. 289-300
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] In this paper they present magnetoresistivity and Hall effect measurements performed on a YBCO epitaxial film as a function of the angle θ between the external magnetic field and the a-b planes. The resistivity and Hall effect measurements are analyzed in term of the general scaling approach proposed by Blatter and coworkers; the Hall conductivity data are examined to separate the contributions due to vortices and quasi particles
Record Type
Journal Article
Journal
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] A novel magnetic procedure has been introduced for the determination of the degree of texturing of the superconducting grains in Ag-sheathed (Bi,Pb)2Sr2Ca2Cu3Ox tapes. Our new method is based on the observation that, in the BSCCO family of superconductors, a relevant anisotropy is present between the in-plane and out-of-plane critical current densities of individual crystallites. By neglecting the magnetic moment of the single grain due to out-of-plane circulating currents, and by comparing magnetic hysteresis loops measured within different field orientations with respect to the tape direction, it has been possible to determine the average degree of texture of an assembly of BSCCO superconducting grains. As a result of our simple approach, we have measured the texture evolution of the precursor grains during the cold deformation process of unreacted multifilamentary (Bi,Pb)2Sr2Ca2Cu3Ox tapes; moreover, we have been also able to distinguish between longitudinal and transverse texture of the grains with respect to the tape direction. Finally, the usefulness of our method has been verified on tapes prepared with various precursor powders and cold deformation techniques. (author)
Primary Subject
Secondary Subject
Source
IWCC9: 9. international workshop on critical currents in superconductors; Madison, WI (United States); 7-10 Jul 1999; Country of input: International Atomic Energy Agency (IAEA); 8 refs; This record replaces 31038719
Record Type
Journal Article
Literature Type
Conference
Journal
Superconductor Science and Technology (Online); ISSN 1361-6668;
; v. 12(12); p. 1108-1111

Country of publication
ALKALINE EARTH METAL COMPOUNDS, BISMUTH COMPOUNDS, CALCIUM COMPOUNDS, CHALCOGENIDES, COPPER COMPOUNDS, CURRENTS, ELECTRIC CONDUCTIVITY, ELECTRIC CURRENTS, ELECTRICAL PROPERTIES, LEAD COMPOUNDS, MICROSTRUCTURE, ORIENTATION, OXIDES, OXYGEN COMPOUNDS, PHYSICAL PROPERTIES, STRONTIUM COMPOUNDS, SUPERCONDUCTORS, TRANSITION ELEMENT COMPOUNDS, TYPE-II SUPERCONDUCTORS
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
1 | 2 | 3 | Next |