Radio-frequency magnetoabsorption in YBCO-Ag and BSCCO superconductors: the cross-over between two-level and one-level critical state models
Creators
- 1. Department of Physics and Meteorology, Indian Institute of Technology, Kharagpur (India)
Description
We have studied the virgin curve and hysteresis of radio-frequency magnetoabsorption in YBCO-Ag(YBa2Cu3O7-δ:Ag1.2) and BSCCO (Bi2Sr2CaCu2O8+δ) samples at 77 K in a magnetic field up to a value of 2 kOe. The hysteresis of YBCO-Ag is in good agreement with the prediction of the two-level critical state model. However, in the case of BSCCO the agreement is there only when the maximum field does not exceed 67.5 Oe for a frequency of 1.5 MHz. For higher fields the results resemble those of the one-level critical state model. This is due to the fact that at fields greater than 67.5 Oe the superconducting grain boundaries become normal. The cross-over point shifts to 55 Oe when the frequency is increased to 12 MHz. A qualitative explanation of this shift is given on the basis of the disordered model. (author)
Availability note (English)
Available online at the Web site for the journal Superconductor Science and Technology (ISSN 1361-6668) http://www.iop.org/Additional details
Identifiers
- URL
- http://www.iop.org/;
Publishing Information
- Journal Title
- Superconductor Science and Technology
- Journal Volume
- 9
- Journal Issue
- 6
- Journal Page Range
- p. 447-452
- ISSN
- 0953-2048
INIS
- Country of Publication
- United Kingdom
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 32004425
- Subject category
- S36: MATERIALS SCIENCE;
- Descriptors DEI
- BARIUM OXIDES; BISMUTH OXIDES; CALCIUM OXIDES; COPPER OXIDES; CUPRATES; GRAIN BOUNDARIES; HIGH-TC SUPERCONDUCTORS; HYSTERESIS; STRONTIUM OXIDES; SUPERCONDUCTIVITY; YTTRIUM OXIDES
- Descriptors DEC
- ALKALINE EARTH METAL COMPOUNDS; BARIUM COMPOUNDS; BISMUTH COMPOUNDS; CALCIUM COMPOUNDS; CHALCOGENIDES; COPPER COMPOUNDS; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; MICROSTRUCTURE; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; STRONTIUM COMPOUNDS; SUPERCONDUCTORS; TRANSITION ELEMENT COMPOUNDS; TYPE-II SUPERCONDUCTORS; YTTRIUM COMPOUNDS