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Conductance of atomic size contacts of Ag and Au at high magnetic fields

Beilun Wu1,2,3, Andrés Martínez4, Paula Obladen1,2,3, Marta Fernández-Lomana1,2,3, Edwin Herrera1,2,3, Carlos Sabater4, Juan José Palacios2,3,5, Isabel Guillamón1,2,3, and Hermann Suderow1,2,3,*

  • *Contact author: hermann.suderow@uam.es
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Phys. Rev. Research 8, 013091 – Published 27 January, 2026

DOI: https://doi.org/10.1103/cmh2-frmf

Abstract

Electronic conduction at the atomic scale can be described by Landauer’s formalism. In single-atom point contacts of noble metals like Au and Ag, there is just one channel open between both electrodes and the conductance is very close to the quantum of conductance G≈G0=2e2h, with the factor of two coming from spin degeneracy. The magnetoconductivity of atomic size contacts has been studied for numerous systems, unveiling local Kondo screening, magnetic order, and spin-polarized currents. However, these have been mostly performed in elements with multiple open conduction channels where G differs from G0. The realization of a magnetically active conductor with a single-open channel remains difficult to achieve. Here, we present measurements of the electronic conductance of single-channel Au and Ag atomic size contacts in magnetic fields up to 20 T. We observe a decrease in G which goes up to about 15% in many Au contacts at 20 T. We perform calculations and find that pure Ag and Au do not present a strong field dependence of G, in agreement with previous results at smaller magnetic fields. We also find, however, that residual O2 molecules attached close to the contact produce an induced spin-polarized current, which leads to a decrease in G. We discuss the role of the magnetic response of the electrodes in the jump-to-contact. Our results suggest that single channel atomic size conductors with a sizable response to a magnetic field can be built by combining noble metals and magnetically active molecular systems.

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Phys. Rev. Research 8, 013091– Published 27 January, 2026
  • Received 11 April 2025
  • Accepted 9 January 2026
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