Effects of plastic deformation on the superconducting specific-heat transition of niobium

Journal Article · Mon Oct 01 04:00:00 EDT 1979 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.325735· OSTI ID:5950364

Zubeck, R B; Barbee, Jr, T W; Geballe, T H; Chilton, F

Effects of plastic deformation on the normal, zero-field, and mixed-state specific heat of the type-II superconductor niobium were experimentally investigated. A high-resolution ac calorimetry technique was developed and used to study the effects of plastic deformation on the specific-heat superconducting transition in fields up to 2750 Oe. A method for the analysis of high-resolution specific-heat data near the superconducting transition is presented and used to determine kappa variations (within a material) caused by plastic deformation. The effects of plastic deformation on the bulk superconducting transition temperature and width are also shown. Measurements of the zero-field specific heat show a systematic increase in width of the specific-heat transition with increasing deformation as well as a small increase in T/sub c/. Both kappa and the kappa variation increase with increasing plastic deformation. The analysis method allows the specific-heat data of the mixed state to be decomposed in a way consistent with previously reported anisotropy data for niobium.

• Research Organization: W. H. Hansen Laboratories of Physics, Stanford University, Stanford, California 94305
• OSTI ID: 5950364
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 50:10; ISSN JAPIA
• 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
ANISOTROPY
CALORIMETRY
DATA
DEFORMATION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
INFORMATION
MAGNETIC FIELDS
METALS
NIOBIUM
PHYSICAL PROPERTIES
REFRACTORY METALS
RESOLUTION
SPECIFIC HEAT
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS
TRANSITION TEMPERATURE