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Citation 2

Accession Number

003461437

Author

Kheifets AS. Veinger AI. Zabrodskii AG. Kazakov SV. Timofeev MP.

Institution

A.F. Ioffe Physicotech. Inst., Acad. of Sci., Leningrad, USSR.

Title

Nature of microwave absorption in superconducting ceramic YBa/sub 2/Cu/sub
3/O/sub 7/ subjected to weak magnetic fields.

Source

Fizika Tverdogo Tela, vol.31, no.1, Jan. 1989, pp.294-7. USSR.

Country of Publication

USSR.

Translated Source

Soviet Physics - Solid State (USA), vol.31, no.1, Jan. 1989, pp.162-3. CODEN:
SPSSA7. ISSN: 0038-5654.

Abstract

A considerable change in microwave absorption in weak magnetic fields has been observed for metal oxide ceramics belonging to the Me-Ba(Sr)-Cu-O systems (Me=La, Y, etc.). The effect is explained qualitatively by a transition from the Meissner to the mixed state or by the properties of a ceramic considered as a macroscopic Josephson medium. The authors provide evidence in support of the former explanation based on a study of magnetic-field and temperature dependences of the effect. The transition to the mixed state in weak fields H<

Abstract Number

A89115698

Subject Headings

Barium compounds
Ceramics
High-temperature superconductors
Meissner effect
Mixed state
Yttrium compounds

Non-Thesaurus Subject Headings

microwave spectra of inorganic solids.

Key Phrase Identifiers

high temperature superconductivity; Meissner state; temperature dependence;
magnetic field dependence; microwave absorption; superconducting ceramic;
weak magnetic fields; mixed state; macroscopic Josephson medium; surface
inhomogeneties; viscous flow; Abrikosov vortices; YBa/sub 2/Cu/sub 3/O/sub
7/.

Classification Codes

Superconductor response to electromagnetic fields, nuclear magnetic
resonance, ultrasonic attenuation [A7430G]; Perovskite phase superconductors
[A7470V]; Mixed state, H/sub c/sub 2, surface sheath [A7460E]; Superconductor
magnetization curves, Meissner effect, penetration depth [A7430C]; Microwave
and radiofrequency interactions with condensed matter [A7870G].

Treatment

Experimental.

Chemicals

YBa2Cu3O7/ss; Ba2/ss; Cu3/ss; Ba/ss; Cu/ss; O7/ss; O/ss; Y/ss.

CODEN

FTVTAC

Language

English.

ISSN

0367-3294.

U.S. Copyright Clearance Center Code

0038-5654/89/010162-02$03.90.

Publication Type

Journal Paper.

Update Code

198900.

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