High critical currents in strained epitaxial YBa sub 2 Cu sub 3 O sub 7 minus. delta. on Si

Journal Article · Mon Sep 10 04:00:00 EDT 1990 · Applied Physics Letters; (USA)

DOI:https://doi.org/10.1063/1.104225· OSTI ID:6483250

Fork, D K ^[1]; Fenner, D B ^[2]; Barton, R W ^[3]; Phillips, J M ^[4]; Connell, G A.N.; Boyce, J B ^[5]; Geballe, T H ^[6]

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1. Xerox Palo Alto Research Center, Palo Alto, CA (USA) Department of Applied Physics, Stanford University, Stanford, CA (USA)
2. Xerox Palo Alto Research Center, Palo Alto, CA (USA) Physics Department, Santa Clara University, Santa Clara, CA (USA)
3. Conductus, Inc., Sunnyvale, CA (USA)
4. AT T Bell Laboratories, Murray Hill, NJ (USA)
5. Xerox Palo Alto Research Center, Palo Alto, CA (USA)
6. Department of Applied Physics, Stanford University, Stanford, CA (USA)

Epitaxial YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} (YBCO) films were grown on Si (100) using an intermediate buffer layer of yttria-stabilized zirconia. Both layers are grown via an entirely {ital in} {ital situ} process by pulsed laser deposition. All films consist of {ital c}-axis oriented grains as measured by x-ray diffraction. Strain results from the large difference in thermal expansion coefficients between Si and YBCO. Thin ({lt}500 A) YBCO films are unrelaxed and under tensile strain with a distorted unit cell. Rutherford backscattering spectroscopy indicates a high degree of crystalline perfection with a channeling minimum yield for Ba as low as 12%. The normal-state resistivity is 280 {mu}{Omega} cm at 300 K; the critical temperature {ital T}{sub {ital c}} ({ital R}=0) is 86--88 K with a transition width ({Delta}{Tc}) of 1 K. Critical current densities of 2{times}10{sup 7} A/cm{sup 2} at 4.2 K and 2.2{times}10{sup 6} A/cm{sup 2} at 77 K have been achieved.

• OSTI ID: 6483250
• Journal Information: Applied Physics Letters; (USA), Journal Name: Applied Physics Letters; (USA) Vol. 57:11; ISSN APPLA; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CURRENTS
ELECTRIC CURRENTS
ELEMENTS
EPITAXY
FILMS
HIGH-TC SUPERCONDUCTORS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SEMIMETALS
SILICON
SUPERCONDUCTING FILMS
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
VAPOR PHASE EPITAXY
YTTRIUM COMPOUNDS
YTTRIUM OXIDES