[HTML][HTML] Giant enhancement of superconductivity in arrays of ultrathin gallium and zinc sub-nanowires embedded in zeolite

B Zhang, J Lyu, A Rajan, X Li, X Zhang, T Zhang… - Materials Today …, 2018 - Elsevier
B Zhang, J Lyu, A Rajan, X Li, X Zhang, T Zhang, Z Dong, J Pan, Y Liu, J Zhang, R Lortz
Materials Today Physics, 2018Elsevier
We have fabricated superconducting samples comprising gallium (Ga) or zinc (Zn) infiltrated
into the one-dimensional (1D) linear channels of AlPO-5 (AFI) zeolite, which have an
internal pore diameter of 7 Å and are separated by an insulating wall of∼ 7–9 Å. The
Angstrom-scale Ga and Zn sub-nanowires, arranged in Josephson-coupled triangular
arrays with an ab-plane lattice constant of 14.4 Å, display bulk superconductivity with T c
values of 7.2 K and 3.7 K, respectively, which are significantly enhanced by a factor of 7 and …
Abstract
We have fabricated superconducting samples comprising gallium (Ga) or zinc (Zn) infiltrated into the one-dimensional (1D) linear channels of AlPO-5 (AFI) zeolite, which have an internal pore diameter of 7 Å and are separated by an insulating wall of ∼7–9 Å. The Angstrom-scale Ga and Zn sub-nanowires, arranged in Josephson-coupled triangular arrays with an ab-plane lattice constant of 14.4 Å, display bulk superconductivity with Tc values of 7.2 K and 3.7 K, respectively, which are significantly enhanced by a factor of 7 and 4 compared with their bulk values. While the zeolite template of our composite superconductor dictates the nanostructure of Ga and Zn to be 1D in the electronic sense with a highly advantageous effect for the superconducting pairing, the arrangement in a densely packed array structure avoids the shortcomings of other typical 1D superconductors, in which the coherence is usually completely suppressed by strong phase fluctuations.
Elsevier
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