A. Yu. Rusanov

Institute of Solid State Physics

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V. A. Oboznov

Institute of Solid State Physics

J. Aarts

Leiden University

V. V. Ryazanov

Moscow Institute of Physics and Technology

A. V. Veretennikov

Institute of Solid State Physics

ГК

Г. К. Струкова

University of Maryland, College Park

I. S. Veshchunov

The University of Tokyo

A. A. Golubov

University of Twente

Evgeniya Yu. Postnova

Institute of Solid State Physics

Gennady Strukov

University of Maryland, College Park

A. N. Rossolenko

Georgi Nadjakov Institute of Solid State Physics

Cooperative Institutions

Institute of Solid State Physics

Russian Academy of Sciences

Moscow Institute of Physics and Technology

Centre National de la Recherche Scientifique

Georgi Nadjakov Institute of Solid State Physics

Lomonosov Moscow State University

Sorbonne Université

National University of Science and Technology

Institute of Solid State Physics

Scientific Center of RAS in Chernogolovka

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Ex situ elaborated proximity mesoscopic structures for ultrahigh vacuum scanning tunneling spectroscopy

Applied Physics Letters (2014)

V. S. Stolyarov Tristan Cren F. Debontridder Christophe Brun I. S. Veshchunov

We apply ultrahigh vacuum Scanning Tunneling Spectroscopy (STS) at ultra-low temperature to study proximity phenomena in metallic Cu in contact with superconducting Nb. In order to solve the problem of Cu-surface contamination, Cu(50 nm)/Nb(100 nm) structures are grown by respecting the inverted order of layers on SiO2/Si substrate. Once transferred into vacuum, the samples are cleaved at the structure-substrate interface. As a result, a contamination-free Cu-surface is exposed in vacuum. It enables high-resolution STS of superconducting correlations induced by proximity from the underlying superconducting Nb layer. By applying magnetic field, we generate unusual proximity-induced superconducting vortices and map them with a high spatial and energy resolution. The suggested method opens a way to access local electronic properties of complex electronic mesoscopic devices by performing ex situ STS under ultrahigh vacuum.

Mesoscopic physics

Ultra-high vacuum

10.1063/1.4874647

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Citations (7)

Superconductivity of Nanostructured Pb<SUB>7</SUB>Bi<SUB>3</SUB> Films Doped by Ce

Journal of Nanoscience and Nanotechnology (2012)

V. S. Stolyarov V. N. Zverev E. Yu. Postnova G. V. Strukov Г. К. Струкова

By means of electrochemical deposition from electrolytes, containing salts of Pb and Bi (0.03 mol/l and 0.02 mol/l respectively) thin films of intermetallic Pb7Bi3 have been fabricated. The superconducting transition temperature of the films was measured to be around 7.8 K. The deposition of the films with thickness of 50-100 nm was performed via passing rectangular current pulses with given amplitude and length. It was shown that adding salt of Ce into the electrolyte leads to a significant growth of the Tc for the deposited films reaching its maximum at the salt concentration of 0.06 mol/I. X-ray analysis data revealed the single phase of Pb7Bi3 films with hexagonal structure (SG) having a textures parallel to (101) plane. The morphology of the film surface is characterized by nanocluster structure with typical grain size around 70-80 nm. For the films, fabricated with adding salt of Ce, together with the intermetallic phase of Pb7Bi3, the second phase containing Bi is detected. At the same time, the typical grain size is reduced to 20-30 nm. Additionally, the suppression of the superconductivity in the grown films is investigated. The influence of the composition and structure on the superconducting critical temperature is discussed for both types of the fabricated films.

10.1166/jnn.2012.4930

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Citations (2)

Mesoscopic Models of Plants Composed of Metallic Nanowires

Journal of Bionic Engineering (2013)

Г. К. Струкова Gennady Strukov Evgeniya Yu. Postnova A. Yu. Rusanov I. S. Veshchunov

Mesoscopic physics

Biomimetics

10.1016/s1672-6529(13)60232-2

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Citations (10)

Depairing Currents in Bilayers of Nb/Pd89Ni11

Springer eBooks (2007)

A. Yu. Rusanov J. Aarts M. Aprili

10.1007/978-1-4020-5107-4_12

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Supercurrents through the superconductor–ferromagnet–superconductor (SFS) junctions

Physica B Condensed Matter (2000)

A. V. Veretennikov V. V. Ryazanov V. A. Oboznov A. Yu. Rusanov V. A. Larkin

Oscillation (cell signaling)

10.1016/s0921-4526(99)02086-4

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Citations (51)

Inverse spin switch effects in ferromagnet-superconductor-ferromagnet trilayers with strong ferromagnets

Physical Review B (2006)

A. Yu. Rusanov S. Habraken J. Aarts

In ferromagnet-superconductor-ferromagnet $(F∕S∕F)$ trilayers where the magnetization directions of the $F$ layers can be controlled separately, it has theoretically been predicted that the antiparallel (AP) configuration can have a higher superconducting transition temperature ${T}_{c}$ than the parallel $(P)$ configuration. This is the so-called spin switch, which has been found experimentally for the case of weak ferromagnets. Here we show that strong ferromagnets yield the opposite effect. We study the transport properties of $F∕S∕F$ trilayers with $F={\mathrm{Ni}}_{0.80}{\mathrm{Fe}}_{0.20}$ (Permalloy, Py) and $S=\mathrm{Nb}$, structured in strips of different sizes. Using two different thicknesses for the Py layers, we can switch, in a well-defined way, between the AP and $P$ configurations. In the superconducting transition we find a clear increase of the resistance in the AP state. We ascribe this to enhanced reflection of spin-polarized quasiparticles at the $S∕F$ interfaces, which leads to a stronger suppression of superconductivity on the $S$ side.

Antiparallel (mathematics)

Permalloy

Andreev reflection

10.1103/physrevb.73.060505

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Citations (121)

Change in the sign of the magnetoresistance effect in bilayer superconductor/ferromagnet structures under change in the type of the domain structure in the ferromagnet

JETP Letters (2008)

A. Yu. Rusanov T. E. Golikova С. В. Егоров

Permalloy

10.1134/s0021364008030120

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Citations (14)

SUPERCURRENTS THROUGH THE SUPERCONDUCTOR-FERROMAGNET-SUPERCONDUCTOR

Physica A Statistical Mechanics and its Applications (2000)

A. V. Veretennikov V. V. Ryazanov V. A. Oboznov A. Yu. Rusanov V. A. Larkin

Type-I superconductor

Source

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Citations (2)

Enhancement of the Superconducting Transition Temperature inNb/PermalloyBilayers by Controlling the Domain State of the Ferromagnet

Physical Review Letters (2004)

A. Yu. Rusanov M. Hesselberth J. Aarts A. I. Buzdin

In (S/F) hybrids the suppression of superconductivity by the exchange field ${h}_{\mathrm{e}\mathrm{x}}$ of the ferromagnet can be partially lifted when different directions of ${h}_{\mathrm{e}\mathrm{x}}$ are sampled simultaneously by the Cooper pair. In F/S/F trilayers where the magnetization directions of the F layers can be controlled separately, this leads to the so-called spin switch. Here we show that domain walls in a single F layer yield a similar effect. We study the transport properties of ${\mathrm{N}\mathrm{i}}_{0.80}{\mathrm{F}\mathrm{e}}_{0.20}/\mathrm{N}\mathrm{b}$ bilayers structured in strips of different sizes. For large samples a clear enhancement of superconductivity takes place in the resistive transition, in the very narrow field range (order of 0.5 mT) where the magnetization of the Py layer switches and many domains are present. This effect is absent in microstructured samples.

10.1103/physrevlett.93.057002

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Citations (137)

With no Color and Scent: Nanoflowers of Metals and Alloys

arXiv (Cornell University) (2011)

Г. К. Струкова Gennady Strukov Evgeniya Yu. Postnova A. Yu. Rusanov Aegyle D. Shoo

Ordered volume submicron surface structures "nanoflowers" - are obtained while growing metal nanowires in porous membranes by means of pulsed current electroplating. These structures occur if the electroplating is continued after the nanowires appear on the membrane surface. Various ordered Ag, Pb, PdNi and PbIn volume structures of complex shape resembling living plant organisms are produced. Some of the structures are formed by spherical and ellipsoidal nanoclusters. Membrane geometry and pulsed current electroplating parameters are the main factors, which determine the shape formation process of these ordered structures at the surface of porous membranes. Choosing the membrane geometry, electrolyte composition and pulsed current electroplating parameters one can deliberately fabricate volume ordered complex shape nano- and submicron structures of various metals and alloys. Such objects can be of interest for fundamental research as well as for applications in catalysis, electronics, optics, medicine, etc.

10.48550/arxiv.1108.4589

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Citations (2)