M. H. W. Chan : Electrical properties of one-dimensional superconducting and magnetic nanowires @ Penn State Physics

Chan's group is currently interested in investigating the effects of quantum fluctuations on the electrical properties of one dimensional superconducting nanowires(with diameters from sub-10nm to 100nm). We are also interested in exploring the spin-dependent transport properties in hybrid superconductor/ferromagnet nanostructures.

When the diameter of a superconducting wire is smaller than the coherence length and penetration depth, its behavior is expected to deviate from that of bulk and crosses-over to that of one-dimensional (1-d) superconducting system. In spite of extensive experimental studies over the last two decades, there are still considerable controversies on what are the expected properties of a 1-d superconductor. The main reason for the uncertainties is the variety of microstructure and morphology of the samples used in the experiments. Using template-assembly technique, high quality single-crystal superconducting Sn, Pb, Zn and AuSn nanowires can be fabricated by electrodepositing metals into porous membranes. Quantum confinement effects in these single-crystal wires has been clearly observed along with some novel phenomenon e.g. Anti-proximity effect in 40nm Zn nanowires sandwiched between bulk superconductors.

Publications

2003 · 2004 · 2005 · 2006 · All

M. Tian, N. Kumar, J. Wang, S. Xu and M. H. W. Chan, "Influence of Bulk Superconducting Environment on Superconductivity of One-Dimensional Zinc Nanowires," Phys. Rev. B 74, 014515 (2006)

M. Tian, J. Wang, J. S. Kurtz, Y. Liu, T. E. Mallouk, T. S. Mayer and M. H. W. Chan, "Dissipation in quasi-one-dimensional superconducting single-crystal Sn nanowires," Phys. Rev. B 71, 104521 (2005)

M. Tian, N. Kumar, S. Xu, J. Wang, J. S. Kurtz and M. H. W. Chan, "Suppression of superconductivity in Zn nanowires by bulk superconductors," Phys. Rev. Lett. 95, 076802 (2005)

M. Tian, N. Kumar, S. Xu, J. Wang, J. S. Kurtz and M. H. W. Chan, "Suppression of superconductivity in nanowires by bulk superconductors," Phys. Rev. Lett. 95, 076802 (2005)

J. Wang, M. Tian, J. S. Kurtz, T. E. Mallouk and M. H. W. Chan, "Microtwining in Template Sythesized Single Crystal Novel Metal Nanowires," J. Phys. Chem. B 108, 841 – 845 (2004)

M. Tian, J. Wang, J. W. Snyder, J. S. Kurtz, Y. Liu, P. Schiffer, T. E. Mallouk and M. H. W. Chan, "Synthesis and Characterization of Superconducting Single Crystal Sn Nanowires," Appl. Phys. Lett. 83, 1620 – 1622 (2003)

M. Tian, J. Wang, J. S. Kurtz, T. E. Mallouk and M. H. W. Chan, "Electrochemical Growth of Single-Crystal Metal Nanowires via a Two-Dimensional Nucleation and Growth Mechanism," Nanoletters 3, 919 – 923 (2003)

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