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Anomalous Meissner effect in a normal-metal-superconductor junction with a spin-active interface.

Takehito Yokoyama¹, Yukio Tanaka, Naoto Nagaosa

¹Department of Physics, Tokyo Institute of Technology, Tokyo, Japan.

Physical Review Letters

|July 21, 2011

Summary

We discovered that spin-active interfaces in normal-metal-superconductor junctions cause unusual oscillatory behavior in magnetic susceptibility. This phenomenon is linked to the generation of odd-frequency pairing, impacting magnetic fields and current densities.

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Area of Science:

Condensed Matter Physics
Superconductivity
Spintronics

Background:

The Meissner effect is a hallmark of superconductivity, involving the expulsion of magnetic fields.
Spin-active interfaces in heterostructures can mediate exotic electronic phenomena.
Understanding interfacial effects is crucial for novel superconducting devices.

Purpose of the Study:

To investigate the Meissner effect in normal-metal-superconductor (NMS) junctions with spin-active interfaces.
To explore the behavior of orbital magnetic susceptibility in the normal metal component of such junctions.
To elucidate the role of odd-frequency pairing in these systems.

Main Methods:

Theoretical investigation of NMS junctions.
Analysis of orbital magnetic susceptibility.
Modeling of spin-active interface effects.
Study of superconducting pairing symmetries.

Main Results:

Observed highly nontrivial behavior in the normal metal's orbital magnetic susceptibility.
Demonstrated temperature-dependent oscillatory magnetic susceptibility with sign changes.
Predicted spatial oscillations of magnetic field and current density within the normal metal.
Attributed these phenomena to the generation of odd-frequency pairing.

Conclusions:

Spin-active interfaces fundamentally alter the electrodynamic response of NMS junctions.
Odd-frequency pairing is a key mechanism driving the observed oscillatory phenomena.
These findings open new avenues for controlling magnetism and superconductivity at interfaces.