Interface superconductivity

Gariglio, Stefano; Gabay, M.; Mannhart, J.; Triscone, Jean‐Marc

doi:10.1016/j.physc.2015.02.028

Cited by 44 publications

(30 citation statements)

References 93 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The in-plane coherence length remains larger than the superconducting thickness for all dopings [14,39], which is again consistent with the 2D character of the superconducting 2DEL. Figure 2 displays the thicknesses and critical temperatures measured as a function of the Hall density n 2D [27].…”

Section: Experimental Determination Of the 2del Thickness In Laosupporting

confidence: 80%

“…This confirms the 2D nature of the superconducting state across the whole phase diagram. The angular dependence of the critical fields allows us to determine the in-plane coherence length ξ (T ) and the effective thickness L of the superconducting 2DEL [39]. From the perpendicular critical field H c⊥ (T ), we extract…”

Section: Experimental Determination Of the 2del Thickness In Laomentioning

confidence: 99%

See 1 more Smart Citation

Modulation of the superconducting critical temperature due to quantum confinement at the LaAlO3/SrTiO3 interface

et al. 2017

Self Cite

View full text Add to dashboard Cite

Superconductivity develops in bulk doped SrTiO 3 and at the LaAlO 3 /SrTiO 3 interface with a dome-shaped density dependence of the critical temperature T c , despite different dimensionalities and geometries. We propose that the T c dome of LaAlO 3 /SrTiO 3 is a shape resonance due to quantum confinement of superconducting bulk SrTiO 3 . We substantiate this interpretation by comparing the exact solutions of a three-dimensional and quasi-two-dimensional two-band BCS gap equation. This comparison highlights the role of heavy bands for T c in both geometries. For bulk SrTiO 3 , we extract the density dependence of the pairing interaction from the fit to experimental data. We apply quantum confinement in a square potential well of finite depth and calculate T c in the confined configuration. We compare the calculated T c to transport experiments and provide an explanation as to why the optimal T c 's are so close to each other in two-dimensional interfaces and the three-dimensional bulk material.

show abstract

Section: Experimental Determination Of the 2del Thickness In Laosupporting

confidence: 80%

Section: Experimental Determination Of the 2del Thickness In Laomentioning

confidence: 99%

Modulation of the superconducting critical temperature due to quantum confinement at the LaAlO3/SrTiO3 interface

et al. 2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…Based on our calculations, we propose a semiquantitative interpretation in terms of an effective mass which increases significantly in ultrathin films. Another system of interest is the twodimensional electron gas at the LaAlO 3 /SrTiO 3 interface, which enters a superconducting phase at a density-dependent temperature slightly lower than the T c of bulk SrTiO 3 [30]. Whether or not this interface superconductivity has the same origin as in bulk SrTiO 3 , and whether it can be understood by the confinement of SrTiO 3 carriers, remain important open issues [31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Rise and fall of shape resonances in thin films of BCS superconductors

2016

View full text Add to dashboard Cite

The confinement of a superconductor in a thin film changes its Fermi-level density of states and is expected to change its critical temperature T c . Previous calculations have reported large discontinuities of T c when the chemical potential coincides with a subband edge. By solving the BCS gap equation exactly, we show that such discontinuities are artifacts and that T c is a continuous function of the film thickness. We also find that T c is reduced in thin films compared with the bulk if the confinement potential is lower than a critical value, while for stronger confinement T c increases with decreasing film thickness, reaches a maximum, and eventually drops to zero. Our numerical results are supported by several exact solutions. We finally interpret experimental data for ultrathin lead thin films in terms of a thickness-dependent effective mass.

show abstract

“…Here it is suspected that the Rashba-type SO coupling at the interface may play an important role in the formation of the superconducting state [75].…”

mentioning

confidence: 99%

Focus on the Rashba effect

2015

View full text Add to dashboard Cite

The Rashba effect, discovered in 1959, continues to supply fertile ground for fundamental research and applications. It provided the basis for the proposal of the spin transistor by Datta and Das in 1990, which has largely inspired the broad and dynamic field of spintronics. More recent developments include new materials for the Rashba effect such as metal surfaces, interfaces and bulk materials. It has also given rise to new phenomena such as spin currents and the spin Hall effect, including its quantized version, which has led to the very active field of topological insulators. The Rashba effect plays a crucial role in yet more exotic fields of physics such as the search for Majorana fermions at semiconductorsuperconductor interfaces and the interaction of ultracold atomic Bose and Fermi gases. Advances in our understanding of Rashba-type spin-orbit couplings, both qualitatively and quantitatively, can be obtained in many different ways. This focus issue brings together the wide range of research activities on Rashba physics to further promote the development of our physical pictures and concepts in this field. The present Editorial gives a brief account on the history of the Rashba effect including material that was previously not easily accessible before summarizing the key results of the present focus issue as a guidance to the reader.

show abstract

Interface superconductivity

Cited by 44 publications

References 93 publications

Modulation of the superconducting critical temperature due to quantum confinement at the LaAlO3/SrTiO3 interface

Modulation of the superconducting critical temperature due to quantum confinement at the LaAlO3/SrTiO3 interface

Rise and fall of shape resonances in thin films of BCS superconductors

Focus on the Rashba effect

Contact Info

Product

Resources

About