Comment on ``Magnetic-Field Enhancement of Superconductivity in Ultranarrow Wires''
Maxim Yu. Kharitonov, Mikhail V. Feigel'man
TL;DR
This paper analytically examines the conditions under which magnetic fields can enhance superconductivity in nanowires, clarifying experimental observations and challenging previous attributions to magnetic moments.
Contribution
It derives analytical conditions explaining the magnetic-field enhancement of superconductivity in nanowires, providing a theoretical framework for experimental results.
Findings
Analytical conditions for superconductivity enhancement identified
Magnetic moments are not necessary for the observed behavior
Key features of experiments explained theoretically
Abstract
The authors of a recent Letter [Phys. Rev. Lett. 97, 137001 (2006)] observed enhancement of the critical supercurrent of superconducting nanowires in external magnetic field. They attributed the obtained behavior to the presence of magnetic moments in the samples. In this Comment we derive the conditions, crucial for the existence of the observed behavior, and show that they explain the key features of the experiment analytically.
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Taxonomy
TopicsPhysics of Superconductivity and Magnetism · Quantum, superfluid, helium dynamics · Quantum many-body systems