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Digitale Medien

Influence of He Ion bombardment at medium energies on the vortex instability at high current densities observed in YBaCuO films (1996)

Xiao, Z. L. ; Häring, J. ; Heinz, B. ; [weitere]

Springer

Journal of low temperature physics 105 (1996), S. 1159-1164

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Details

ISSN: 1573-7357

Schlagwort(e): 61.80Jh ; 74.60.Ge ; 74.76.Bz

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract Isothermal current-voltage (I–V) characteristics of c-axis orientedYBa 2 CU 3 O 7−δ films taken in different external magnetic fields μoH, exhibit voltage jumps at a well defined current density J*(T, H) pointing to a specific instability of the vortex system. Interpreted as Larkin- Ovchinnikov (LO)-instability, this behavior allows to extract the inelastic scattering time Tin of quasiparticles. In the present work, the LO-analysis is applied to study the effect of additional defects on Tin. For this purpose,YBa 2 CU 3 O 7−δ films were irradiated at 77K with increasing fluences Φ of 350 ke V He+ ions. The I-V characteristics were determined in the temperature range 45K 〈 T 〈 80K and in magnetic fields up to 5 Tesla. While J* as well as the superconducting transition temperature Tc are significantly decreased by the ion bombardment, the critical vortex velocity as deduced from LO-theory is much less affected. If the temperature dependence of the extracted scattering times Γin is rescaled by plotting versus the reduced temperature t = T/Tc(Φ), the results for all ion fluences fall on one common curve within the error bars. This leads to the conclusion that a universal quasiparticle density nN(t) dominates the scattering rate 1/Tin.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00753856

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Digitale Medien

Stress analysis around a three-dimensional craze in glassy polymers (1993)

Xiao, Z. M. ; Pae, K. D.

Stamford, Conn. [u.a.] : Wiley-Blackwell

Polymer Engineering and Science 33 (1993), S. 1189-1194

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Details

ISSN: 0032-3888

Schlagwort(e): Chemistry ; Chemical Engineering

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Maschinenbau , Physik

Notizen: Stress analysis around a three-dimensional craze and a three-dimensional craze containing a penny-shaped crack has been made. The craze is treated as a transversely isotropic, oblate spheroid embedded in an isotropic glassy polymer. The craze is assumed to consist of primary fibrils and cross-tie fibrils, such that a penny-shaped crack may form at the central regime of the craze. The craze surface stress, the stress field near the craze tip outside the craze region, and the stress intensity factor in the crack tip are determined by using Eshelby's equivalent inclusion method. Numerical values of the fracture toughness and the stress needed to sever a craze fibril at the crack tip are calculated and the results appear to be in good agreement with the data given in the literature.

Zusätzliches Material: 6 Ill.