Superconducting properties of silicon nanostructures

Bagraev, N. T.; Klyachkin, L. E.; Koudryavtsev, A. A.; Malyarenko, A. M.; Romanov, V. V.

doi:10.1134/s1063782609110098

Cited by 25 publications

(29 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The knee on the Δ(kT) dependence at T ≈ 146 K seems to be started from the change in the density of states involved into the recombination process. This temperature is in good agreement with the value of the critical temperature of the superconductor transition, T c ≈ 145 K, estimated from magnetic susceptibility, electrical resistivity and specific heat anomaly measurements [9]. So the charge correlations in the system of shallow boron acceptors seem to induce the observed distortion of parabolic densities of states at low temperatures revealed by spectral line-shape analysis.…”

supporting

confidence: 67%

“…Furthermore such high boron concentrations favor charge correlations starting to dominate in a system of shallow acceptors leading to their reconstruction into the trigonal dipole centers [3]. It appears to result in the high temperature superconductivity previously found in the silicon nanostructures with high concentration of boron [9]. The additional wide asymmetric spectral band detected at the lowest temperature (Fig.…”

mentioning

confidence: 85%

See 1 more Smart Citation

Light emission from nanoscale silicon heterojunctions

Kuzmin¹,

Bargaev²,

Klyachkin³

et al. 2013

AIP Conference Proceedings

View full text Add to dashboard Cite

supporting

confidence: 67%

mentioning

confidence: 85%

Light emission from nanoscale silicon heterojunctions

Kuzmin¹,

Bargaev²,

Klyachkin³

et al. 2013

AIP Conference Proceedings

View full text Add to dashboard Cite

“…High-temperature superconductivity is typical of many other nanostructures. For example, it is typical of ultrathin NbC films and films from the aforementioned magnesium diboride, MgB 2 [168], ultra-narrow silicon (Si) quantum p-wells bounded by δ-barriers and heavily doped with boron [169], copper-containing fullerene quantum-well samples of endohedral nanostructures with the included element atom location inside the carbonic structure [170] and also of other nanostructures limiting the charge carrier movement in one, two, or three dimensions.…”

Section: Peculiar Properties Of Nanostructure Superconductivitymentioning

confidence: 99%

High-temperature superconductivity: From macro- to nanoscale structures

Коваленко¹

2016

Nanosystems: Phys. Chem. Math.

View full text Add to dashboard Cite

The analysis of achievements, problems and prospects of high-temperature superconductivity (HTSC) in the macro-and nanostructured materials has been given. The main experimental results and theoretical models describing the physical mechanisms of the superconductivity appearance at phenomenological and microscopic levels, including change in the energy spectrum of atoms in these materials with the advent of the 'superconducting' gap at temperatures below the critical transition, as well as the above-critical temperature 'pseudo-gap' have been analyzed.Although the origin of the pseudo-gap is not completely understood, it can be considered as an independent phase transition in the substance prior to the transition to the zero resistance state and insusceptibility (or insensitivity) to external magnetic field in high-temperature superconductors. Features of multi-gap and gapless superconducting materials as well as their ability to further increase the temperature of supercritical transition are discussed. Large resources to create the necessary electron and phonon spectra in the process of high-temperature superconductivity formation are associated with the use of nanoscale structures and nanoparticles of conductors and dielectrics. Electrical conductive contacts between nanoparticles and tunnel chains of nanoclusters, where delocalized electron spectra form similar energy shells to the atomic or nuclear shells, play a significant part here. It is required to further investigate the occurrence of high-temperature superconductivity at the level of interphase layers (non-autonomous phases) in nanostructures containing a large fraction of the substance in this condition. It is essential to develop adequate methods for synthesis of nanoparticles of variable size, structure and morphology, as well as techniques for their consolidation that would ensure the preservation of superconductivity of individual nanoparticles, their chemical, thermal, magnetic and current stability in the dissipative processes with functional and fluctuation effects.

show abstract

“…Similar behavior of the critical temperature and critical field for the superconducting transition have been observed during successive capture of vortices on large quantum dots "embedded" in bulk and low-dimensional structures based on classical and high-temperature superconductors. [28][29][30] These studies showed that the sequential capture of quantum vortices induces a quantization of the supercurrent in nanostructured superconductors which shows up in the corresponding oscillations of the critical temperature and critical field. [28][29][30][31] Given the dimensions of the microdefects in the plane of nanostructured CdB x F 2Àx d-barriers (d % 150 nm) 21,22 found by scanning tunneling microscopy (STM), the period of the oscillations in the critical temperature is in good agreement with the above model for quantization of the supercurrent.…”

Section: Introductionmentioning

confidence: 99%

Quantization of magnetic moment in CdBxF2−x/p-CdF2–QW/CdBxF2−x nanosandwiches

Bagraev

Klyachkin

Romanov

et al. 2014

Low Temperature Physics

Self Cite

View full text Add to dashboard Cite

The tunneling current-voltage characteristics, and the temperature and field dependences of the specific heat and static magnetic susceptibility of planar CdB x F 2Àx /p-CdF 2 -QW/CdB x F 2Àx sandwich structures produced on the surface of n-CdF 2 crystals are studied in order to establish the superconducting properties of the CdB x F 2Àx d-barriers which delimit the ultranarrow p-type CdF 2 quantum well. A comparative analysis of the current and conduction voltage characteristics below and above the superconducting transition temperature shows that the supercurrent quantization and the size quantization of the holes in the p-CdF 2 quantum well are related. Measurements of the field and temperature dependences of the static magnetic susceptibility of these sandwich structures reveal de Haas-van Alphen (dHvA) oscillations at high temperatures and low magnetic fields. The temperature dependences of the amplitudes of the dHvA oscillations give a low value for the effective mass of the two-dimensional holes, so that the strong field condition lB ) 1 is met at high temperatures. A periodic change in the frequency of the dHvA oscillations accompanied by a diamagnetic response with rising temperature is detected for the first time; it exhibits synchronous temperature oscillations in the density and effective mass of the two-dimensional holes owing to the mesoscopic properties of the d-barriers. These results are explained in terms of the formation of quantum states of a Bose condensate, which is a consequence of a discrete change in the Cooper pair coherence length of the holes when the superconducting d-barriers have a fractal structure. V C 2014 AIP Publishing LLC. [http://dx.

show abstract

Superconducting properties of silicon nanostructures

Cited by 25 publications

References 63 publications

Light emission from nanoscale silicon heterojunctions

Light emission from nanoscale silicon heterojunctions

High-temperature superconductivity: From macro- to nanoscale structures

Quantization of magnetic moment in CdBxF2−x/p-CdF2–QW/CdBxF2−x nanosandwiches

Contact Info

Product

Resources

About