Quasiparticle density of states in the perpendicular direction to the Cu-O planes in YBa sub 2 Cu sub 3 O sub 7 minus x single-crystal thin films

Journal Article · Fri Sep 01 04:00:00 EDT 1989 · Physical Review (Section) B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.40.4478· OSTI ID:5650487

Takada, J; Terashima, T; Bando, Y ^[1]; Mazaki, H ^[2]; Iijima, K; Yamamoto, K; Hirata, K ^[3]

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1. Institute for Chemical Research, Kyoto University, Uji 611, Japan (JP)
2. Department of Mathematics and Physics, The National Defense Academy, Yokosuka 239, Japan
3. Research Institute for Production Development, Kyoto 606, Japan

Tunneling spectra were observed in normal-metal--insulator--superconductor junctions fabricated from single-crystal films of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}}(001), epitaxially grown on SrTiO{sub 3}(100). The quasiparticle density of states observed in the perpendicular direction to the Cu-O planes exhibits a lifetime broadening picture of quasiparticles at the gap edges. The broadening parameter increases with an increase of the temperature. The recombination lifetime at 60 K is estimated to be 10{sup {minus}13} s. A gap parameter {Delta}{sub {perpendicular}}(4.6 K) of 9.0{plus minus}1.8 meV and a coupling constant of (2.4{plus minus}0.5){lt}2{Delta}{sub {perpendicular}} (0)/kT{sub c} {lt}(3.5{plus minus}0.7) were obtained.

• OSTI ID: 5650487
• Journal Information: Physical Review (Section) B: Condensed Matter; (USA), Journal Name: Physical Review (Section) B: Condensed Matter; (USA) Vol. 40:7; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTALS
ENERGY GAP
ENERGY-LEVEL DENSITY
FILMS
JUNCTIONS
LIFETIME
MONOCRYSTALS
OXIDES
OXYGEN COMPOUNDS
QUASI PARTICLES
RECOMBINATION
SUPERCONDUCTING JUNCTIONS
TEMPERATURE DEPENDENCE
THIN FILMS
TRANSITION ELEMENT COMPOUNDS
VERY LOW TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES