Residual losses in epitaxial thin films of YBa sub 2 Cu sub 3 O sub 7 from microwave to submillimeter wave frequencies

Journal Article · Mon Oct 28 04:00:00 EST 1991 · Applied Physics Letters; (United States)

DOI:https://doi.org/10.1063/1.106058· OSTI ID:5192669

Miller, D; Richards, P L ^[1]; Etemad, S; Inam, A; Venkatesan, T; Dutta, B; Wu, X D ^[2]; Eom, C B; Geballe, T H ^[3]; Newman, N; Cole, B F ^[4]

---

1. Department of Physics, University of California Materials Sciences Division,Lawrence Berkeley Laboratory, Berkeley, California (USA)
2. Bell Communications Research, Red Bank, New Jersey (USA)
3. Department of Applied Physics, Stanford University, Stanford, California (USA)
4. Conductus, Inc., Sunnyvale, California (USA)

We have measured the residual loss in five epitaxial {ital a}-{ital b} plane films of the high-{ital T}{sub {ital c}} superconductor YBa{sub 2}Cu{sub 3}O{sub 7}. Microwave measurements near 10 GHz were made by resonance techniques at 4 K. Submillimeter measurements from {similar to}1.5 to 21 THz were made at 2 K by a direct absorption technique. We use a model of weakly coupled superconducting grains and a homogeneous two-fluid model to fit the data for each film below the well-known absorption edge at 13.5 THz. When the penetration depth determined from muon spin rotation measurements is used to constrain each model, the weakly coupled grain model is able to fit the measured absorptivities for all films, but the two-fluid model is less successful.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5192669
• Journal Information: Applied Physics Letters; (United States), Journal Name: Applied Physics Letters; (United States) Vol. 59:18; ISSN APPLA; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ABSORPTIVITY
AC LOSSES
ALKALINE EARTH METAL COMPOUNDS
AMINES
AMMONIUM COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ENERGY LOSSES
EPITAXY
FILMS
FREQUENCY DEPENDENCE
HIGH-TC SUPERCONDUCTORS
LOSSES
MICROWAVE SPECTRA
OPTICAL PROPERTIES
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PENETRATION DEPTH
PHYSICAL PROPERTIES
QUATERNARY COMPOUNDS
SPECTRA
SUPERCONDUCTING FILMS
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES