Hysteresis of internal friction in superconducting indium

Journal Article · Fri Oct 01 04:00:00 EDT 1976 · Sov. J. Low Temp. Phys. (Engl. Transl.); (United States)

OSTI ID:7318493

Pal-Val, L N; Platkov, V Y; Startsev, V I

The amplitude dependence of internal friction in both normal and superconducting indium was measured at the ultrasonic frequency of 7.5 MHz. It has been established that in the s-state the direct run curve of attenuation coefficient versus signal amplitude, where the latter is increased from its minimum to its maximum value, does not coincide with the subsequently plotted reverse run curve and that thus a hysteresis loop is formed. The reverse run curve lies below the direct run curve. In the case of normal indium, on the other hand, both curves always coincide. The difference between them, when they form a hysteresis loop, depends on the maximum amplitude attained at the end of the direct experimental run. This hysteresis in the s-state also effects the amplitude dependence of the attenuation in the n-state. Annealing at 30-50/sup 0/K restores the hysteresis loop in the s-state. The results of this study are analyzed here from the standpoint of changes in the structure of dislocation pinning centers at the time when this structure breaks away under alternating stresses of large amplitude.

• Research Organization: Physicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR
• OSTI ID: 7318493
• Journal Information: Sov. J. Low Temp. Phys. (Engl. Transl.); (United States), Journal Name: Sov. J. Low Temp. Phys. (Engl. Transl.); (United States) Vol. 2:10; ISSN SJLPD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ANNEALING
ATTENUATION
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DISLOCATIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
FREQUENCY RANGE
FRICTION
HEAT TREATMENTS
HYSTERESIS
INDIUM
INTERNAL FRICTION
LINE DEFECTS
METALS
MHZ RANGE
MHZ RANGE 01-100
PHYSICAL PROPERTIES
SOUND WAVES
SUPERCONDUCTIVITY
ULTRASONIC WAVES