Anomalous oscillatory magnetoresistance in superconductors

Abstract

We report oscillatory magnetoresistance in various superconducting films, with a magnetic-field period ∆B ∼ 0.1 T that is essentially independent of sample dimensions, temperature, transport current, and the magnitude and orientation of the magnetic field, including magnetic fields oriented parallel to the film plane. The characteristics of these oscillations seem hard to reconcile with previously established mechanisms for oscillations in magnetoresistance, suggesting the possibility of a new type of physical origin.

Nonreciprocal transport in gate-induced polar superconductor SrTiO 3

“…4B (for example, T = 0.26, 0.19, and 0.16 K) and even in the raw data (see the Supplementary Materials). It is well known that such an oscillating behavior can appear in various physical quantities of superconductors such as magnetoresistance and Nernst effect due to the vortex matching effect, where the number of vortices matches the lattice constant or artificial structures (37)(38)(39)(40). However, the detailed origin of the oscillating behavior in R xx 2 is the future problem.…”

Oscillatory Nernst effect in Pt|ferrite|cuprate-superconductor trilayer films

“…1c ). Although an oscillatory magnetoresistance with a magnetic-field period of ~0.1 T was observed in YBCO films at 71.0–74.1 K in the low-field range below 1 T 29 , our sample exhibits the zero-resistivity state up to 9 T below 30 K where the voltage oscillation was observed (see also Fig. S3 in Supplementary Information).…”

Subatomic mechanism of the oscillatory magnetoresistance in superconductors

“…In addition, ∆H is the same for all H directions. This points to a different mechanism of the oscillations of magnetoresistance compared to the geometrical origin (1). Indeed, films thickness in [1] is smaller than √ σ and therefore projections of grain areas to the side surface and upper one cannot be equal.…”

“…This points to a different mechanism of the oscillations of magnetoresistance compared to the geometrical origin (1). Indeed, films thickness in [1] is smaller than √ σ and therefore projections of grain areas to the side surface and upper one cannot be equal. Therefore the nature of magnetoresistance oscillations in that case is not of geometrical origin (1), as in Refs.…”

“…Indeed, films thickness in [1] is smaller than √ σ and therefore projections of grain areas to the side surface and upper one cannot be equal. Therefore the nature of magnetoresistance oscillations in that case is not of geometrical origin (1), as in Refs. [18,26,29], but qualitatively different.…”