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Dimensionality of flux pinning in (Bi,Pb)2Sr2Ca2Cu3O10+δ Ag tapes with columnar defects—Crossover from two-dimensional to three-dimensional behavior (1994)

Kummeth, P. ; Struller, C. ; Neumüller, H.-W. ; [et al.]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 65 (1994), S. 1302-1304

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ISSN: 1077-3118

Source: AIP Digital Archive

Topics: Physics

Notes: We introduced columnar defects into (Bi,Pb)2Sr2Ca2Cu3O10+δ Ag tapes by irradiation with 2.65 GeV 197Au ions to investigate the dimensionality of pinning for this compound. Samples were irradiated up to fluences of 3.5×1011 ions/cm2 at a temperature of 100 K. The ion beam was directed both perpendicular and under a tilt angle of −60° to the tape surface. Our samples showed homogeneous columnar line defects throughout the whole thickness of the superconducting core. As a novel result we found evidence for marked deviations from two-dimensional behavior at elevated temperatures both in magnetic and in transport measurements.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.112101

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The influence of columnar defects on the critical current density in (Bi, Pb)2Sr2Ca2Cu3O10 + δAg tapes (1994)

Kummeth, P. ; Struller, C. ; Neumüller, H. -W. ; [et al.]

Springer

Journal of superconductivity 7 (1994), S. 783-786

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ISSN: 1572-9605

Keywords: Columnar defects ; critical current density ; tapes ; 2223 BPSCCO ; pinning energy

Source: Springer Online Journal Archives 1860-2000

Topics: Electrical Engineering, Measurement and Control Technology , Physics

Notes: Abstract An excellent tool to enhance the critical current density in superconductors is the controlled introduction of defects by irradiation damage. Irradiation with 2.65 GeV Au ions provides the generation of amorphous line defects. Polycrystalline (Bi, Pb)2Sr2Ca2Cu3O10 + δ Ag tapes processed by the powder-in-tube technique were irradiated up to doses of 3.5× 1011 Au ions/cm2 at a temperature of 100 K. On the one hand, our irradiation experiments were performed to investigate the degree ofj c enhancement and, on the other hand, to examine the flux pinning mechanism in (Bi, Pb)2Sr2Ca2Cu3O10 + δ tapes. Characterization of the samples was performed by magnetization measurements using a vibrating sample magnetometer (VSM) up to 13 T in a temperature range between 5 and 100 K. Further, we have measured the relaxation of the magnetic moment before and after irradiation to determine the influence of columnar defects on the activation energyU. A comparison of the irradiation-induced effects with previous results obtained on Bi2Sr2CaCu2O8 + δ irradiation experiments is included.