Microwave absorption studies of high T sub c superconductors and related materials 8; ESR of DPPH coated on BiSrCaCuO films fabricated on MgO (100) substrates

Journal Article · Sat Jun 20 04:00:00 EDT 1992 · Modern Physics Letters B; (Singapore)

DOI:https://doi.org/10.1142/S0217984992001733· OSTI ID:7088646

Sugawara, K; Tanaka, S ^[1]

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1. Superconductivity Research Lab., ISTEC, 10-13, Shinonome 1-chome, Koto-ku, Tokyo 135 (JP)

This paper reports that ESR of DPPH coated on Bi-Sr-Ca-Cu-O films fabricated on MgO (100) substrates by MOCVD have been studied for samples with different thicknesses, 1000 {Angstrom} and 100 {Angstrom}. Temperature dependence of the ESR peak-to-peak linewidth, {Delta}H{sub pp}, revealed that {Delta}H{sub pp} increases with film thickness. The Excess ESR linewidth, {delta}({Delta}H{sub pp}) was also analyzed in terms of (1 {minus} t{sup alpha}, with t = T/T{sub c}, giving for example {alpha} = 4 ={minus}1 for the 1000 {Angstrom} thick sample. The ESR lineshapes were distorted by rotating the samples in applied magnetic fields. Severe distortion was found for the 1000 {Angstrom} sample below about 30 K, but the distortion almost disappears at temperatures above 30 K. The applied magnetic field effects were also examined in both field-cooled and zero-field-cooled cases.

• OSTI ID: 7088646
• Journal Information: Modern Physics Letters B; (Singapore), Journal Name: Modern Physics Letters B; (Singapore) Vol. 6:14; ISSN MPLBE; ISSN 0217-9849
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
661200 -- Techniques of General Use in Physics-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION SPECTRA
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
CALCIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL COATING
CHEMICAL VAPOR DEPOSITION
COATINGS
COPPER COMPOUNDS
CUPRATES
DEPOSITION
DIMENSIONS
DPPH
ELECTRON SPIN RESONANCE
FILMS
HIGH-TC SUPERCONDUCTORS
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MAGNETIC RESONANCE
MICROWAVE SPECTRA
NITRO COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RADICALS
RESONANCE
SPECTRA
STRONTIUM COMPOUNDS
SUPERCONDUCTING FILMS
SUPERCONDUCTORS
SURFACE COATING
TEMPERATURE DEPENDENCE
THICKNESS
TRANSITION ELEMENT COMPOUNDS