Magnetically modulated microwave absorption measurement of the penetration depth in a polycrystalline YBa sub 2 Cu sub 3 O sub 7 minus x thin film

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

DOI:https://doi.org/10.1063/1.348215· OSTI ID:5491167

Karim, R; Vittoria, C ^[1]; Widom, A ^[2]; Chrisey, D B; Horwitz, J B ^[3]

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1. Department of Electrical Engineering, Northeastern University, Boston, Massachusetts 02115 (USA)
2. Physics Department, Northeastern University, Boston, Massachusetts 02115 (USA)
3. Naval Research Laboratory., Washington, DC 01375 (USA)

In previous work, a magnetically modulated microwave absorption (MMMA) technique to measure the Ginzburg--Landau parameter {kappa}=({Lambda}/{xi}) in high-{ital T}{sub {ital c}} superconductors (bulk samples of YBCO) was described. In this work, how this technique can be applied to the measurement of the London penetration depth {Lambda} is described. Data are reported for the temperature variation of {Lambda} in a well-characterized {ital c}-axis-oriented polycrystalline thin film of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}}, prepared by a pulsed laser deposition technique. For low temperatures, {Lambda}(0){congruent}3640 A with the microwave electric field oriented parallel to the {ital c} axis. The temperature dependence of {Lambda}(0)/{Lambda}({ital T}) can be well described by the two-fluid model. The data are also reasonably fit by a BCS model, however the MMMA technique (in the work here reported) does not have the resolution at low temperatures to obtain strong quantitative evidence for an energy gap {Delta} (even if it exists).

• OSTI ID: 5491167
• 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
CRITICAL CURRENT
CRYSTALS
CURRENTS
ELECTRIC CURRENTS
EQUATIONS
FILMS
LONDON EQUATION
MAGNETIC FIELDS
MODULATION
OXIDES
OXYGEN COMPOUNDS
PENETRATION DEPTH
PHYSICAL PROPERTIES
POLYCRYSTALS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES