Mechanism of the effect of the normal-superconducting transition on the amplitude-dependent damping and modulus defect in lead

Journal Article · Fri Jan 01 04:00:00 EST 1982 · J. Low Temp. Phys.; (United States)

DOI:https://doi.org/10.1007/BF00655441· OSTI ID:5682719

Soifer, Y M; Golosovski, M A; Kobelev, N P

Measurements of the amplitude-dependent damping and modulus defect in lead of various purities in the normal and superconducting states were carried out at frequencies of 100 kHz and 5 MHz. It is found that the effect of the normal-superconducting (N-S) transition is different for the amplitude-dependent damping and the modulus defect, this difference being dependent on the purity of the specimens used and the frequency of the measurements. Two cases are observed. In the first the ratio of the amplitude-dependent damping to the corresponding modulus defect is the same in both the N and S states, and in the second the ratio is changed significantly at the N-S transition. It is shown that in the first case the damping is due to hysteretic loss alone and the N-S transition only changes the conditions of dislocation breakaway from the pinning points. In the second the dynamic loss contribution determined by the viscous drag of the dislocations to the total loss is essential and the N-S transition changes the magnitude of that contribution. A model is proposed to take into account the influence of viscous drag of the dislocations upon the amplitude-dependent damping and modulus defect. A method of evaluating of the dynamic contribution in the total loss is suggested. The results obtained are discussed in terms of existing models of the effect of the N-S transition on the conditions of dislocation breakaway and of the present model.

• Research Organization: Institute of Solid State Physics, Academy of Sciences of the USSR, Chernogolovka, USSR
• OSTI ID: 5682719
• Journal Information: J. Low Temp. Phys.; (United States), Journal Name: J. Low Temp. Phys.; (United States) Vol. 46:1; ISSN JLTPA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360100 -- Metals & Alloys
360104* -- Metals & Alloys-- Physical Properties
656101 -- Solid State Physics-- Superconductivity-- General Theory-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AMPLITUDES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTALS
DAMPING
DISLOCATIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
FREQUENCY RANGE
FRICTION
INTERNAL FRICTION
KHZ RANGE
KHZ RANGE 01-100
LEAD
LINE DEFECTS
METALS
MHZ RANGE
MHZ RANGE 01-100
MONOCRYSTALS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
SUPERCONDUCTIVITY