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1

Digitale Medien

Tunneling measurement of the quasiparticle lifetime in Ba1−xKxBiO3 (1994)

Zasadzinski, Roberta ; Vandervoort, K. G. ; Hinks, D. G. ; [weitere]

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

Journal of Applied Physics 76 (1994), S. 407-411

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: The temperature dependence of the energy gap of bulk polycrystalline Ba1−xKxBiO3 (BKBO) was measured with a low-temperature scanning tunneling microscope in the point contact mode. At 4.2 K, the tunneling conductance shows nearly ideal BCS behavior, however at higher temperatures, the lifetime broadening term Γ was required to fit the data. Γ(T) displays a surprising T3 temperature dependence and the magnitude is significantly larger than the calculated theoretical recombination times. Comparisons with other conductance data obtained from grain boundary and sandwich-type BKBO junctions show similar results. The large scattering rates for BKBO may be important for the utility of this material in SIS mixers.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.357090

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2

Digitale Medien

Study of the proximity effect in Nb/Au, Bi2Sr2CaCu2O8+y/Au, and HgBa2CuO4/Ag using a scanning tunneling microscope (1996)

Zasadzinski, Roberta ; Vandervoort, K. G. ; Crabtree, G. W.

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

Journal of Applied Physics 79 (1996), S. 7843-7848

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Proximity effect gaps were observed consistently in Nb/Au, Bi2Sr2CaCu2O8+y/Au, and HgBa2CuO4/Ag bilayers using a low temperature scanning tunneling microscope. The Nb/Au conductance curves [dI(V)/dV vs V] were fit by the Arnold model, using the accepted energy gap value of Nb, 1.55 meV. The application of gold and silver overlayers allowed vacuum tunneling and topographic images of BSCCO single crystals and the HgBa2CuO4 polycrystalline sample. Cleavage steps of varying sizes (up to 1500 A(ring)) in the BSCCO/Au sample were observed, and gaplike features were found on such steps. Consistent, reproducible energy gaps were also found in the Hg-compound sample. © 1996 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.362373

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3

Digitale Medien

Observation of the development of hysteretic behavior using a scanning tunneling microscope (1997)

Zasadzinski, Roberta ; De Wilde, Yannick ; Crabtree, George W.

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

Journal of Applied Physics 82 (1997), S. 3175-3181

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: A scanning tunneling microscope was used to record tip-sample displacements inferred from the tunnel current versus applied piezoelectric voltage. This provides a means to determine the range in which the mechanical system, especially the piezoelectric element, exhibits hysteretic behavior. Graphite and gold were used as the substrate samples. With graphite, reversible behavior of the displacements is observed until 2.1 Å; beyond this point, the system exhibits persistent irreversible behavior. In the gold system, irreversible behavior appears initially at 0.8 Å, but repeated cycling extends the range of reversibility to a displacement of 3–4.8 Å. Irreversible behavior dominates beyond this tip displacement range, although the system exhibits sporadic reversible behavior even for tip excursions as large as 46 Å. © 1997 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.365646

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