Modulated microwave absorption in single crystal Bi--Sr--Ca--Cu--O

Journal Article · Wed Apr 01 04:00:00 EST 1992 · Journal of Materials Research; (United States)

DOI:https://doi.org/10.1557/JMR.1992.0837· OSTI ID:7237899

Rubins, R S ^[1]; Trybula, Z; Waplak, S; Drumheller, J E ^[2]; Shi, D; Xu, M ^[3]

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1. Department of Physics, University of Texas at Arlington, Box 19059, Arlington, Texas 76017 (United States) Montana State University, Bozeman, Montana 59717 (United States)
2. Department of Physics, Montana State University, Bozeman, Montana 59717 (United States)
3. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)

Modulated microwave absorption measurements at 9.3 GHz were made on the low field absorption observed in the superconducting phase of Bi--Sr--Ca--Cu--O. The line intensity observed with a low modulation amplitude of 50 mOe showed a maximum between 70 K and 80 K and dropped to zero near 95 K. With a modulation amplitude of 10 Oe, an additional broad line absorption was observed above 88 K, peaking in intensity near 95 K, and disappearing above 100 K. Hysteresis, associated with flux trapping, occurred when the maximum field {ital H}{sub max} in a sweep cycle exceeded a critical value {ital H}*({ital T}), which varied from about 7 Oe at 59 K to 1 Oe at 82 K. For {ital H}{sub max}{gt}{ital H}*, the hysteresis splitting at first varied linearly with ({ital H}{sub max}{minus}{ital H}*), later saturating at a value {delta}{ital H}{sub max}({ital T}). Above 70 K, the relationship {delta}{ital H}{sub max} ={ital b}({ital T}{sub 0}{minus}{ital T}) was obeyed with {ital T}{sub 0}=92.3 K and {ital b}{sub {perpendicular}} ={minus}0.3 Oe/K for {ital H} perpendicular and {ital b}{sub {parallel}}={minus}0.23 Oe/K for {ital H} parallel to the {ital c}-axis.

• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 7237899
• Journal Information: Journal of Materials Research; (United States), Journal Name: Journal of Materials Research; (United States) Vol. 7:4; ISSN JMREE; ISSN 0884-2914
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ABSORPTION
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTALS
ELECTROMAGNETIC RADIATION
FREQUENCY RANGE
GHZ RANGE
GHZ RANGE 01-100
HIGH-TC SUPERCONDUCTORS
HYSTERESIS
MICROWAVE RADIATION
MODULATION
MONOCRYSTALS
OXIDES
OXYGEN COMPOUNDS
RADIATIONS
SORPTION
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
TEMPERATURE RANGE
TEMPERATURE RANGE 0065-0273 K
TRANSITION ELEMENT COMPOUNDS