Orientation, temperature, and frequency dependence of nonresonant microwave absorption in HTSC powders

Journal Article · Mon Apr 15 04:00:00 EDT 1991 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.348211· OSTI ID:5690474

Gould, A; Huang, M; Bhagat, S M ^[1]; Tyagi, S ^[2]

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1. Department of Physics, University of Maryland, College Park, Maryland 20742-4111 (USA) Center for Superconductivity Research, University of Maryland, College Park, Maryland 20742-4111 (USA)
2. Department of Physics and Atmospheric Science, Drexel University, Philadelphia, Pennsylvania 11004 (USA)

Hysteresis in the microwave-power absorption of HTSC powders was studied as a function of temperature ({ital T}), field-sweep amplitude ({ital H}{sub max}), and orientation between the dc field ({bold H}{sub dc}) and the wave vector of the microwaves ({bold k}). It was found that (i) the sizable low-temperature hysteresis effects occur only if {bold H}{sub dc}{parallel}{bold k}, (ii) the temperature and frequency dependence of the hysteresis is strongly affected by {ital H}{sub max}, (iii) the high- and low-temperature virgin curves are quite different, and (iv) the minimum of the absorption signal increases with {ital H}{sub max} and {ital T}. The low-temperature hysteresis loops were found to be similar to loops obtained from nonlinear equations describing cusp catastrophes.

• OSTI ID: 5690474
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 69:8; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ABSORPTION
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTROMAGNETIC RADIATION
FREQUENCY DEPENDENCE
HIGH-TC SUPERCONDUCTORS
HYSTERESIS
MAGNETIC FIELDS
MICROWAVE RADIATION
ORIENTATION
OXIDES
OXYGEN COMPOUNDS
POWDERS
RADIATIONS
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES