Fluxoid pinning by vanadium carbide precipitates in superconducting vanadium

Journal Article · Sat Apr 01 04:00:00 EST 1978 · J. Low Temp. Phys.; (United States)

DOI:https://doi.org/10.1007/BF00116236· OSTI ID:6790535

Marker, III, A J; Reed, R W; Brickwedde, F G; Schuyler, III, R L; Bitler, W R

Vanadium carbide precipitates were formed in pure, annealed vanadium foils by the introduction of carbon in the specimens. Thin, disk-shaped precipitates resulted with mean diameters in the range 100--2600 A and with number densities from 3 x 10/sup 1/5 to 3 x 10/sup 1/7 particles/cm/sup 3/. The macroscopic, pinning-force density for magnetic fluxoids was measured at temperatures from 2 to 5 K and for magnetic fluxoids was measured at temperatures from 2 to 5 K and for magnetic fields from 0 to H/sub c2/(T). Peak pinning-force densities in the range of3 x 10/sup 4/ to 3 x 10/sup 6/ dyn/cm/sup 3/ for T=0K were realized in the 30 specimens studied. The pinning force density was found to obey a scaling law for specimens studied. The pinning force density was found to obey a scaling law for specimens meeting certain requirements with respect to precipitate particle size and number density. These requirements correlate with the temperature-dependent, superconducting coherence length xi (T) is large in comparison with the precipitate size.

• Research Organization: Department of Physics, Pennsylvania State University, University Park, Pennsylvania
• OSTI ID: 6790535
• Journal Information: J. Low Temp. Phys.; (United States), Journal Name: J. Low Temp. Phys.; (United States) Vol. 30:7; ISSN JLTPA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CARBIDES
CARBON COMPOUNDS
COHERENCE LENGTH
ELEMENTS
MAGNETIC FLUX
METALS
PHYSICAL PROPERTIES
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TRANSITION TEMPERATURE
TYPE-II SUPERCONDUCTORS
VANADIUM
VANADIUM CARBIDES
VANADIUM COMPOUNDS