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Growth of high-Tc YBa2Cu3Oy films with an off-axis sputtering configuration (1993)

Wang, L. M. ; Sung, H. H. ; Chern, J. H. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 73 (1993), S. 8419-8422

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: Using an off-axis rf sputtering configuration, we have prepared in situ high-Tc YBa2Cu3O7−y (YBCO) films with a relatively large deposition rate. The sputtering gas was a mixture of Ar and O2 (7:3) and the substrates were MgO(100) and SrTiO3(100). We found that the distance from the target to the substrate, d, is a key factor in the deposition rate. By decreasing d to a value of about 1.5–2.5 cm, we obtained a deposition rate as great as 2000–2500 A(ring) per hour with an rf power of 120 W and at a total pressure 100–200 mTorr. The transport behaviors of the as-grown YBCO films under magnetic fields are reported. The activation energy derived from the resistive transition in magnetic fields is thickness dependent.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.353411

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A finite element model for thin-walled members (1983)

Gellin, S. ; Lee, G. C. ; Chern, J. H.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 19 (1983), S. 59-71

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ISSN: 0029-5981

Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Notes: Thin-walled members subject to generalized loading may be modelled by using a finite element approach with conventional stress and strain parameters. A solution method for a class of problems that would use these elements is described. A numberical example of an elastic beam is given.

Additional Material: 6 Ill.