Here we review the literature concerning measurement of the Andreev reflection between a superconductor (S) and ferromagnet (F), with particular attention to the case where the ferromagnet is a transition metal oxide. We discuss the practicality of utilization of the current models for determination of the transport current spin polarization and examine the evidence for Andreev bound states.This article is part of the theme issue 'Andreev bound states'.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6030146 | PMC |
| http://dx.doi.org/10.1098/rsta.2015.0001 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Nonreciprocal superconductivity.
Sci Adv
November 2024
Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
Article Synopsis
- The concept of nonreciprocal superconductors involves breaking inversion and time-reversal symmetries, leading to an uneven energy dispersion in these materials.
- Andreev reflection is used to detect nonreciprocal superconductivity, with a transparent junction between a normal metal and a nonreciprocal superconductor showing an asymmetric current-voltage relationship.
- Potential candidates for nonreciprocal superconductors include materials like graphene and UTe, as well as specially designed platforms for research.
Nano-positioning plays a very important role in applications such as scanning probe microscopy and optics. We report the development of a compact inertial nanopositioner along with fully computer interfaced electronics operating down to 2 K and its use in our fully automated needle-anvil type Point Contact Andreev Reflection (PCAR) apparatus. We also present the fully automated operational procedures using the LabVIEW interface with our home-built electronics.
View Article and Find Full Text PDFAndreev Reflection in the Quantum Hall Regime at an Al/InAs Junction on a Cleaved Edge.
Nano Lett
November 2024
NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi 243-0198, Japan.
We have fabricated a superconductor/semiconductor junction composed of Al and InAs using cleaved edge overgrowth. By exploiting the unique geometry with a thin Al/Pt/Al trilayer formed on the side surface of an in situ cleaved InAs quantum well heterostructure wafer, we achieve a superconducting critical field of ∼5 T, allowing superconductivity and quantum Hall (QH) effects to coexist down to filling factor ν = 3. Andreev reflection at zero magnetic field shows a conductance enhancement limited solely by the Fermi velocity mismatch, demonstrating a virtually barrier-free junction.
View Article and Find Full Text PDFDrag on Cylinders Moving in Superfluid He-B as the Dimension Spans the Coherence Length.
J Low Temp Phys
June 2024
Department of Physics, Lancaster University, Lancaster, LA1 4YB UK.
Vibrating probes when immersed in a fluid can provide powerful tools for characterising the surrounding medium. In superfluid He-B, a condensate of Cooper pairs, the dissipation arising from the scattering of quasiparticle excitations from a mechanical oscillator provides the basis of extremely sensitive thermometry and bolometry at sub-millikelvin temperatures. The unique properties of the Andreev reflection process in this condensate also assist by providing a significantly enhanced dissipation.
View Article and Find Full Text PDFInduced superconducting correlations in a quantum anomalous Hall insulator.
Nat Phys
July 2024
Physics Institute II, University of Cologne, Cologne, Germany.
Article Synopsis
- Thin films of ferromagnetic topological insulators can achieve the quantum anomalous Hall effect without needing an external magnetic field.
- Researchers demonstrated crossed Andreev reflection in a system where a superconducting Nb electrode interacts with a chiral edge state, indicating superconducting pair formation.
- Their findings suggest a significant link between superconductivity and chiral edge states, paving the way for further exploration of topological superconductivity and Majorana zero modes.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!